List of Colorado ballot measures

The U.S. state of Colorado has had a system of direct voting since gaining statehood in 1877. Citizens and the Colorado General Assembly both have the ability to place new legislation, legislation recently passed by the General Assembly, and constitutional amendments on the ballot for a popular vote. Colorado has three types of ballot measures that can be voted on in a statewide election: initiatives, referendums, and legislatively-referred measures. In order to be placed on the ballot, supporters of a measure must gather signatures from registered voters. From 1877 to 1910, the only ballot measures allowed were legislatively-referred measures. In 1910, Referendum 3 was placed on the ballot by the General Assembly and passed, creating a citizen-led process for initiatives and referendums. The first successful citizen-initiated measures were passed in 1912.

Background

A Colorado woman campaigns for women's suffrage

The 1876 Constitution of Colorado included procedures for the General Assembly to place measures on the ballot in a statewide election. In the 1890s, a grassroots movement to increase citizen power began, culminating in a special session of the legislature to discuss initiative and referendums in 1910. That session resulted in 1910's Referendum 3, which passed with over 76% of the vote and created a citizen-initiated process. From 1877 to 2016, constitutional amendments required only a simple majority to pass. In 2016, Amendment 71 passed and raised the threshold to 55%. In 2020, as part of his administration's response to the COVID-19 pandemic, Governor Jared Polis issued an emergency rule allowing petition signature gatherers to do so via email and mail, rather than in-person efforts. The change, while upheld by the Denver District Court, was overturned by the Colorado Supreme Court later that year.

After the 1876 constitutional convention in Colorado, a legislatively-referred constitutional amendment which would have granted women the right to vote was placed on the ballot for the 1877 election. The measure failed, with over two-thirds of voters voting against it. Henry Blackwell, a founder of the American Woman Suffrage Association, summed up the unsuccessful campaign by saying "Woman Suffrage can never be carried by a popular vote without a political party behind it". Blackwell was proven correct in 1893 when, in part due to gains made by the Colorado People's Party in the General Assembly, voters supported a women's suffrage ballot measure by a 54-45 margin.

In 1970, The International Olympic Committee granted Denver hosting rights for the 1976 Winter Olympics. Governor John Love claimed that the games would cost taxpayers only $5,000,000. Activists quickly noted a wide variety of issues with the state's cost estimate, however, including a lack of transportation infrastructure, no planning for the Olympic Village, and issues with planned events sites. A petition for 1972's Measure 8 quickly reached the necessary 51,000 signatures and nearly 60% of Coloradans voted to prohibit the state from funding the Olympics. Later estimates found that the cost for Denver to host the games would have been $92,000,000, over 18 times the state's estimate. Richard Lamm, who was a leader in the local anti-Olympics movement, would later parlay his fame from the measure into three-terms as Governor.

Commercial marijuana operations, such as the one pictured, were legalized as a result of 2012's Amendment 64

1984's Amendment 3, which barred the use of state funds for abortion services, passed by less than one percentage point. The measure gave Colorado the distinction of being both the first state to decriminalize abortion, having done so in 1967, and the first state to prohibit the government from funding it. 1990's Amendment 5 has been credited by the Initiative & Referendum Institute as having started the term limits movement in the United States and was followed by similar initiatives in 1994 and 1996. Colorado's efforts were unique because they placed term limits on members of Congress in addition to state-level officials. The term-limits movement would result in the Supreme Court case U.S. Term Limits, Inc. v. Thornton, which determined that states could not place restrictions on congresspeople beyond the constitutional requirements.

In 2006, Amendment 20 passed with 54% of the vote and legalized the medical use of marijuana in the state. It was followed by 2012's Amendment 64, which passed by similar margins and legalized the recreational use of marijuana. The Economist described the vote as "an electoral first not only for America but for the world." Colorado continued this trend of loosening drug policy in 2022 when voters passed Proposition 122 and legalized the use of psilocybin mushrooms in designated "healing centers".

Types of ballot measures

Citizen-initiated

The Constitution of Colorado grants citizens some initiative and referendum powers in Article V. In order for a measure to be placed on the ballot, a petition must receive signatures equal to 5% of the votes cast in the previous election. The governor's veto power does not extend to citizen-initiated measures, which go into effect within one month of election returns being certified.

• Initiatives create new state statutes or constitutional amendments. They may be placed on the ballot if their petition is filed at least three months before the upcoming election.
• Referendums repeal legislation passed in the previous General Assembly session. They may be placed on the ballot if their petition is filed at least 90 days after the previous General Assembly session adjourns.

Government-initiated

At the General Assembly's discretion, the legislature may place additional measures on the ballot. Article XIX of the Constitution requires that constitutional amendments passed by the legislature be voted on in the next general election. The General Assembly can also vote to place statute changes and proposed spending on the general election ballot.

1800s

1877

Ballot Measures from 1877

Measure name	Description	Passed?	Yes votes	No votes
Referendum 1	A constitutional amendment granting women the right to vote	No	6,612 (32.00%)	14,053 (68.00%)

1880

Ballot Measures from 1880

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment requiring uniform taxation	Yes	19,198 (84.80%)	3,436 (15.20%)

1881

Ballot Measures from 1881

Measure name	Description	Passed?	Yes votes	No votes
State Capital Referendum	A referendum on whether the permanent location of the state capital should be Denver or some other location	Yes	30,248 (66.48%)	15,249 (33.52%)

1882

Ballot Measures from 1882

Measure name	Description	Passed?	Yes votes	No votes
Amendment 2	A constitutional amendment establishing salaries for some state officials	Yes	32,858 (79.00%)	8,738 (21.00%)

1884

Ballot Measures from 1884

Measure name	Description	Passed?	Yes votes	No votes
Amendment 3(a)	A constitutional amendment modifying some General Assembly procedures	Yes	47,020 (88.00%)	6,413 (12.00%)
Amendment 3(b)	A constitutional amendment modifying some General Assembly procedures	Yes	45,080 (87.90%)	6,188 (12.10%)
Amendment 3(c)	A constitutional amendment modifying some General Assembly procedures	Yes	45,394 (88.00%)	6,180 (12.00%)

1886

Ballot Measures from 1886

Measure name	Description	Passed?	Yes votes	No votes
Amendment 4	A constitutional amendment vesting judicial power in the state court system	Yes	17,068 (63.90%)	9,629 (36.10%)
Amendment 5	A constitutional amendment relating to "original jurisdiction"	Yes	16,897 (64.10%)	9,453 (35.90%)
Amendment 6	A constitutional amendment providing for additional judges on the Colorado Supreme Court	No	6,478 (30.00%)	15,132 (70.00%)
Amendment 7	A constitutional amendment allowing the General Assembly to establish criminal courts	No	7,549 (29.00%)	18,512 (71.00%)
Amendment 8	A constitutional amendment allowing the General Assembly to create police magistrates	No	7,148 (27.80%)	18,553 (72.20%)
Amendment 9	A constitutional amendment relating to judges on Colorado district courts	Yes	14,938 (57.90%)	10,867 (42.10%)
Amendment 10	A constitutional amendment allowing the General Assembly to modify the state court system	Yes	14,568 (51.00%)	14,022 (49.00%)

1887

Ballot Measures from 1887

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to the public debt	Yes	--	--

1888

Ballot Measures from 1888

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment limiting the reasons to contract public debt	Yes	15,212 (53.20%)	13,385 (46.80%)
Measure 2	A constitutional amendment raising property taxes	No	749 (7.90%)	8,778 (92.10%)
Measure 3	A constitutional amendment limiting the reasons to contract public debt	Yes	13,921 (51.30%)	13,209 (48.70%)
Measure 4	A constitutional amendment limiting the reasons to contract public debt	Yes	--	--

1890

Ballot Measures from 1890

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment modifying the size and salaries of the Colorado Supreme Court	No	15,283 (42.10%)	20,991 (57.90%)
Measure 2	A constitutional amendment relating to "compensation and services"	No	15,395 (43.40%)	20,078 (56.60%)

1892

Ballot Measures from 1892

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to uniform taxation	Yes	13,713 (52.70%)	12,294 (47.30%)
Measure 3	A constitutional amendment relating to the maximum tax rate	Yes	12,440 (51.50%)	11,731 (48.50%)

1893

Ballot Measures from 1893

Measure name	Description	Passed?	Yes votes	No votes
Measure 2	A constitutional amendment granting women the right to vote	Yes	35,798 (54.90%)	29,451 (45.10%)

1894

Ballot Measures from 1894

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to locality's "pledging of credit"	No	26,434 (33.80%)	51,711 (66.20%)
Measure 2	A constitutional amendment relating to limits on state debt	No	22,393 (29.50%)	53,634 (70.50%)
Measure 3	A constitutional amendment relating to city debt	No	21,293 (29.70%)	50,513 (70.30%)

1896

Ballot Measures from 1896

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to limits on state debt	No	25,340 (38.90%)	39,790 (61.10%)

1900-1949

1900

Ballot Measures from 1900

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to the process to amend the constitution	Yes	31,471 (73.10%)	11,568 (26.90)

1902

Ballot Measures from 1902

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to the election process for county commissioners	Yes	49,646 (65.10%)	26,559 (34.90%)
Measure 2	A constitutional amendment relating to the city and county of Denver	Yes	59,750 (69.90%)	25,767 (30.1%)
Measure 3	A constitutional amendment relating to the eight-hour work week	Yes	72,980 (73.50%)	26,266 (26.50%)
Measure 4	A constitutional amendment relating to voter qualifications	Yes	44,769 (62.30%)	27,077 (37.70%)
Measure 5	A constitutional amendment relating to the election process for district attorneys	Yes	45,191 (64.20%)	25,243 (35.80%)
Measure 6	A constitutional amendment relating to property tax exemptions	No	32,710 (31.10%)	72,370 (68.90%)
Measure 7	A constitutional amendment relating to tax limits	No	31,527 (31.10%)	69,741 (68.90%)
Measure 8	A constitutional amendment relating to the election process for justices of the peace	Yes	48,682 (65.10%)	26,082 (34.90%)
Measure 9	A constitutional amendment relating to the election process for county officials	Yes	48,944 (65.20%)	26,140 (34.80%)
Measure 10	A constitutional amendment relating to the election process for county judges	Yes	44,856 (63.90%)	25,326 (36.10%)

1904

Ballot Measures from 1904

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to exemptions to uniform taxation	Yes	42,696 (80.30%)	10,444 (19.70%)
Measure 2	A constitutional amendment relating to the Colorado Supreme Court	Yes	5,863 (56.40%)	4,528 (43.60%)
Measure 3	A constitutional amendment relating to the Colorado Supreme Court	Yes	5,006 (54.50%)	4,174 (45.50%)
Measure 4	A constitutional amendment relating to the Colorado Supreme Court	Yes	5,389 (55.70%)	4,293 (44.30%)
Measure 5	A constitutional amendment relating to the Colorado Supreme Court	Yes	5,264 (55.50%)	4,218 (44.50%)

1906

Ballot Measures from 1906

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment relating to the election process and voting machines	Yes	27,460 (72.40%)	10,467 (27.60%)

1908

Ballot Measures from 1908

Measure name	Description	Passed?	Yes votes	No votes
Referendum 1	A constitutional amendment allowing the state to issue bonds for the purpose of paying outstanding warrants	No	26,254 (48.98%)	27,352 (51.02%)
Referendum 2	A constitutional amendment modifying the salaries of state officials and judges	No	16,088 (29.88%)	37,753 (70.12%)
Referendum 3	A constitutional amendment modifying the salaries of county officials	No	18,558 (39.00%)	29,022 (61.00%)

1910

Ballot Measures from 1910

Measure name	Description	Passed?	Yes votes	No votes
Referendum 1	A constitutional amendment allowing the state to issue bonds for the purpose of paying outstanding warrants	Yes	40,054 (50.39%)	39,441 (49.61%)
Referendum 2	A constitutional amendment modifying the Colorado Board of Land Commissioners	Yes	42,128 (66.42%)	21,300 (33.58%)
Referendum 3	A constitutional amendment creating an initiative and referendum process in the state	Yes	89,141 (76.95%)	26,698 (23.05%)
Referendum 4	A constitutional amendment modifying the salaries of state legislators	Yes	39,245 (55.83%)	31,047 (44.17%)
Referendum 5	A constitutional amendment relating to higher education institutions	Yes	59,295 (79.70%)	15,105 (20.30%)

1912

Ballot Measures from 1912

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment prohibiting alcoholic beverages statewide	No	75,877 (39.39%)	116,774 (60.61%)
Measure 2	An initiative allowing search and seizure to enforce prohibition laws	No	64,616 (44.93%)	79,190 (55.07%)
Measure 3	An initiative creating an eight-hour workday for female employees	Yes	108,959 (77.29%)	32,019 (22.71%)
Measure 4	An initiative establishing regulations for public service corporations	No	30,347 (32.12%)	64,138 (67.88%)
Measure 5	An initiative establishing a Colorado State Fair	No	49,102 (48.35%)	52,462 (51.65%)
Measure 6	A constitutional amendment allocating funds for the Colorado Immigration Bureau	No	30,359 (35.87%)	54,272 (64.13%)
Measure 7	An initiative introducing cost-saving measures for publicizing future ballot measures	No	39,551 (43.85%)	50,635 (56.15%)
Measure 8	A constitutional amendment allowing home rule for counties	Yes	49,596 (52.55%)	44,778 (47.45%)
Measure 9	A constitutional amendment establishing a recall process for elected officials	Yes	53,620 (57.54%)	39,564 (42.46%)
Measure 10	An initiative modifying election laws	No	37,616 (49.40%)	38,537 (50.60%)
Measure 11	An initiative establishing a special election system for ballot measures	No	33,413 (45.12%)	40,634 (54.88%)
Measure 12	A constitutional amendment establishing a definition for "contempt of court" and allowing for jury trials for such charges	No	31,850 (43.21%)	41,855 (56.79%)
Measure 13	A constitutional amendment establishing a public utilities court with exclusive power over rates	No	27,534 (34.70%)	51,820 (65.30%)
Measure 14	An initiative providing for a "headless ballot" to be used in elections	Yes	43,390 (52.34%)	39,504 (47.66%)
Measure 15	A constitutional amendment extending wider control of schools to the public	No	38,318 (40.76%)	55,691 (59.24%)
Measure 16	A constitutional amendment establishing juvenile courts in localities with populations greater than 100,000 people	Yes	55,416 (57.54%)	40,891 (42.46%)
Measure 17	An initiative to allocate some public aid to supporting the children of single mothers	Yes	82,337 (68.50%)	37,870 (31.50%)
Measure 18	An initiative modifying the laws relating to civil service	Yes	38,426 (52.13%)	35,282 (47.87%)
Measure 19	An initiative establishing an eight-hour workday for people working in underground mines, smelters, mills, and coke ovens	Yes	52,525 (51.85%)	48,777 (48.15%)
Measure 20	An initiative allocating control of some funds to the Colorado Highway Commission	No	44,568 (49.70%)	45,101 (50.30%)
Measure 21	A referendum to uphold a law requiring teacher examinations	No	25,369 (31.93%)	54,086 (68.07%)
Measure 22	A referendum upholding a law modifying water rights relating to irrigation	No	22,931 (32.51%)	47,614 (67.49%)
Measure 23	A referendum upholding a law which altered the rules surrounding the branding of livestock	No	37,387 (49.77%)	337,740 (50.23%)
Measure 24	A constitutional amendment replacing the Colorado Board of Equalization with the Colorado Tax Commission	No	32,548 (44.86%)	40,012 (55.14%)
Measure 25	A referendum upholding a law which established an eight-hour workday for people working in underground mines, smelters, and coke ovens	Yes	69,489 (69.16%)	30,992 (30.84%)
Measure 26	A referendum upholding a law requiring teachers to attend summer trainings	No	23,521 (27.10%)	63,266 (72.90%)
Measure 27	A constitutional amendment allowing county officials to be paid from outside sources	No	28,889 (40.97%)	41,622 (59.03%)
Measure 28	A constitutional amendment raising the limitation on county debts	No	29,741 (38.61%)	47,284 (61.39%)
Measure 29	A referendum upholding a law which changed some rules related to the management of public funds	No	20,968 (32.12%)	44,322 (67.88%)
Measure 30	A constitutional amendment defining mining and smelting as public interests	No	35,997 (48.68%)	37,953 (51.32%)
Measure 31	A constitutional amendment allowing the state to issue bonds for the purpose of funding state highways	No	36,636 (40.72%)	53,327 (59.28%)
Measure 32	An initiative authorizing the construction of a tunnel through James Peak	No	45,800 (32.95%)	93,183 (67.05%)

1914

Ballot Measures from 1914

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment requiring that rejected measures not be placed on the ballot again until six years have passed	No	55,667 (33.09%)	112,537 (66.91%)
Measure 2	A constitutional amendment prohibiting alcohol	Yes	129,589 (52.30%)	118,176 (47.70%)
Measure 3	A constitutional amendment allowing women to serve as jurors and requiring 3/4 of jurors agree for a verdict to be reached	No	67,130 (46.42%)	77,488 (53.58%)
Measure 4	A constitutional amendment creating a process by which citizens could petition for a special election solely for ballot measures	No	40,643 (33.42%)	80,977 (66.58%)
Measure 5	An initiative to codify some laws relating to women and children	No	68,242 (48.62%)	72,122 (51.38%)
Measure 6	An initiative providing for probation in criminal cases involving minors and first offenders	No	62,561 (47.73%)	68,512 (52.27%)
Measure 7	An initiative increasing the state roads fund for the purpose of constructing new highways	Yes	117,146 (68.51%)	53,844 (31.49%)
Measure 8	A constitutional amendment defining newspapers as public utilities	No	35,752 (28.11%)	91,426 (71.89%)
Measure 9	A referendum upholding a law relating to the capitalization of public utilities	No	37,633 (37.20%)	63,603 (62.80%)
Measure 10	A referendum upholding a law relating to the licensing and regulation of commission merchants	No	39,448 (36.90%)	67,454 (63.10%)
Measure 11	A referendum upholding a law relieving employees from assuming risk of injury or death	Yes	69,006 (53.37%)	60,298 (46.63%)
Measure 12	A referendum upholding a law which altered the peace officer appointment process	No	49,116 (42.36%)	66,836 (57.64%)
Measure 13	A referendum upholding a law relating to a public utilities commission	No	39,703 (37.85%)	65,182 (62.15%)
Measure 14	A constitutional amendment allowing localities sixty years to make up for any indebtedness	No	38,589 (37.18%)	65,206 (62.82%)
Measure 15	A constitutional amendment relating to the equalization of tax assessments	Yes	55,987 (50.32%)	55,275 (49.68%)
Measure 16	An initiative introducing cost-saving measures for publicizing future ballot measures	No	48,301 (46.19%)	56,259 (53.81%)

1916

Ballot Measures from 1916

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A referendum upholding a law relating to medical practice regulation	Yes	96,879 (54.06%)	82,317 (45.94%)
Measure 2	A constitutional amendment to codify the state civil service	No	62,458 (39.28%)	96,561 (60.72%)
Measure 3	A constitutional amendment exempting beer from existing prohibitions on alcohol	No	77,345 (32.16%)	163,134 (67.84%)
Measure 4	An initiative establishing treatment procedures for people with mental illnesses	Yes	164,220 (80.64%)	39,415 (19.36%)
Measure 5	An initiative abolishing the Colorado Tax Commission and transferring its duties to the Colorado Board of Equalization	No	80,362 (48.89%)	84,011 (51.11%)
Measure 6	An initiative relating to the regulation of livestock running	No	85,279 (35.47%)	155,134 (64.53%)
Measure 7	An initiative allowing for the investment of public school funds	Yes	102,956 (60.92%)	66,058 (39.08%)
Measure 8	An measure calling for a constitutional convention	No	53,530 (43.48%)	69,579 (56.52%)

1918

Ballot Measures from 1918

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	An initiative providing public aid for blind adults	Yes	131,469 (93.30%)	9,440 (6.70%)
Measure 2	A constitutional amendment codifying the state civil service	Yes	75,301 (64.59%)	41,287 (35.41%)
Measure 3	An initiative strengthening existing alcohol prohibition	Yes	113,636 (63.71%)	64,740 (36.29%)
Measure 4	A constitutional amendment limiting the time for state legislators to introduce bills from 25 days to 15 days	Yes	67,693 (77.28%)	19,901 (22.72%)
Measure 5	A constitutional amendment relating to the publication of ballot measures before the election	Yes	98,715 (88.97%)	12,237 (11.03%)

1920

Ballot Measures from 1920

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	An initiative establishing fixed hours for city fire department employees	Yes	113,140 (57.80%)	82,596 (42.20%)
Measure 2	An initiative requiring the licensing and regulation of chiropractors	No	84,286 (43.52%)	109,385 (56.48%)
Measure 3	An initiative creating a county called Limon County	No	34,881 (19.81%)	141,239 (80.19%)
Measure 4	An initiative creating a county called Flagler County	No	33,295 (19.17%)	140,363 (80.83%)
Measure 5	A constitutional amendment allowing the state to issue bonds for the purpose of building the Moffat, Monarch, and San Juan Tunnels	No	101,841 (44.68%)	126,099 (55.32%)
Measure 6	An initiative allocating $350,000 for the creation of a Psychopathic Hospital and Laboratory (equivalent to $5,323,256 in 2023)	Yes	155,049 (75.51%)	50,295 (24.49%)
Measure 7	A constitutional amendment creating a property tax for the purpose of funding state educational facilities	Yes	160,268 (75.39%)	52,324 (24.61%)
Measure 8	A constitutional amendment authorizing the state to issue a $5,000,000 bond for the purpose of constructing new highways (equivalent to $76,046,512 in 2023)	Yes	100,130 (58.51%)	70,997 (41.49%)
Measure 9	A constitutional amendment increasing the number of county judges	No	35,095 (26.49%)	97,398 (73.51%)
Measure 10	A constitutional amendment increasing the salaries of constitutional offices and judges	No	49,313 (30.40%)	112,878 (69.60%)

1922

Ballot Measures from 1922

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment allowing the state to issue $1,500,000 in bonds for the purpose of constructing new highways (equivalent to $27,304,175 in 2023)	Yes	131,271 (66.36%)	66,536 (33.64%)
Measure 2	A constitutional amendment creating a public utilities commission	No	75,061 (41.08%)	107,655 (58.92%)
Measure 3	An initiative reapportioning seats in the Colorado General Assembly	No	61,502 (37.72%)	101,537 (62.28%)
Measure 4	A constitutional amendment allowing the legislature to issue some exemptions from the ad valorem tax and create an income tax	No	42,466 (26.08%)	120,355 (73.92%)
Measure 5	An initiative relating to experimental operations on humans and animals	No	35,476 (16.61%)	178,120 (83.39%)
Measure 6	A measure calling for a constitutional convention	No	53,015 (36.29%)	93,081 (63.71%)
Measure 7	A constitutional amendment relating to the location and control of higher education institutions	Yes	87,282 (59.95%)	58,315 (40.05%)
Measure 8	A constitutional amendment establishing four-year terms for some county officials	No	37,945 (26.40%)	105,782 (73.60%)
Measure 9	A constitutional amendment establishing four-year terms for some state officials	No	40,081 (28.54%)	100,367 (71.46%)
Measure 10	A constitutional amendment allowing the legislature to grant non-citizens the ability to own property	No	43,074 (31.15%)	95,219 (68.85%)

1924

Ballot Measures from 1924

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment establishing a state printer and a printing building committee	No	32,150 (12.48%)	225,505 (87.52%)
Measure 2	A constitutional amendment authorizing the state to issue bonds for the purpose of paying bonuses to military members	No	91,510 (43.35%)	119,586 (56.65%)
Measure 3	A constitutional amendment allowing the legislature to set salaries for state officials	No	67,230 (34.20%)	129,344 (65.80%)

1926

Ballot Measures from 1926

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment allowing the General Assembly to set salaries for state officials and judges	No	95,625 (47.73%)	104,709 (52.27%)
Measure 2	A constitutional amendment allowing the General Assembly to set salaries for county officials	No	60,086 (33.69%)	118,284 (66.31%)
Measure 3	A constitutional amendment allowing the legislature to modify vehicle registration fees	No	68,459 (33.77%)	134,292 (66.23%)
Measure 5	A constitutional amendment allowing the General Assembly to regulate alcohol	No	107,749 (41.06%)	154,672 (58.94%)
Measure 6	An initiative allowing dentists licensed in other states to practice in Colorado	No	56,433 (23.59%)	182,816 (76.41%)
Measure 7	A constitutional amendment creating a public utilities commission	No	35,137 (17.88%)	161,372 (82.12%)
Measure 8	An initiative creating a gas tax and vehicle registration fees and mandating that all revenues be used exclusively for roads	No	81,762 (35.98%)	145,482 (64.02%)

1928

Ballot Measures from 1928

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment allowing the General Assembly to set salaries for state officials and judges	Yes	134,724 (53.09%)	119,060 (46.91%)
Measure 2	A constitutional amendment requiring that voters on issues related to school funding be property tax payers	No	69,005 (30.80%)	155,018 (69.20%)
Measure 3	A constitutional amendment modifying eminent domain rules	No	32,294 (16.97%)	157,973 (83.03%)
Measure 4	A constitutional amendment authorizing the state to issue $60,000,000 in bonds for the purpose of constructing new highways (equivalent to $1,064,651,163 in 2023)	No	82,422 (32.16%)	173,881 (67.84%)
Measure 5	A constitutional amendment creating an elected Board of Education	No	84,416 (34.84%)	157,889 (65.16%)

1930

Ballot Measures from 1930

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A measure calling for a constitutional convention	No	93,879 (48.97%)	97,826 (51.03%)
Measure 2	A constitutional amendment creating an elected Board of Education	No	70,643 (32.05%)	149,770 (67.95%)

1932

Ballot Measures from 1932

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment making some county positions hold a four-year term	No	102,117 (37.57%)	169,703 (62.43%)
Measure 2	A referendum upholding a law which increased the oleomargarine tax from 10 cents to 15 cents a pound	No	134,313 (38.16%)	217,671 (61.84%)
Measure 3	An initiative reapportioning seats in the Colorado General Assembly	Yes	162,871 (53.07%)	144,037 (46.93%)
Measure 4	A constitutional amendment allowing the General Assembly to create a graduated income tax	No	85,573 (27.49%)	225,713 (72.51%)
Measure 5	A constitutional amendment allowing the General Assembly to create a limited income tax	No	101,438 (32.11%)	214,464 (67.89%)
Measure 6	A constitutional amendment limiting gas taxes	No	124,610 (33.37%)	248,801 (66.63%)
Measure 7	A constitutional amendment repealing the statewide alcohol prohibition	Yes	233,311 (56.07%)	182,771 (43.93%)

1934

Ballot Measures from 1934

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment centralizing most authority with the Governor of Colorado	No	102,117 (37.57%)	169,703 (62.43%)
Measure 2	A constitutional amendment relating to civil service reform	No	60,745 (24.02%)	192,140 (75.98%)
Measure 3	A constitutional amendment eliminating uniform taxation	No	107,457 (39.98%)	161,952 (60.11%)
Measure 4	A constitutional amendment granting voters authority to approve new taxes	No	126,649 (45.93%)	149,098 (54.07%)
Measure 5	A constitutional amendment requiring that taxes related to gas and vehicles be allocated exclusively for roads	Yes	160,482 (54.68%)	132,994 (45.32%)
Measure 6	A constitutional amendment limiting gas taxes to 3 cents	No	87,090 (31.69%)	187,720 (68.31%)
Measure 7	An initiative to requiring chain stores to pay license fees	Yes	197,144 (55.80%)	156,147 (44.20%)

1936

Ballot Measures from 1936

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment establishing an ownership tax on motor vehicles	Yes	218,795 (66.90%)	108,270 (33.10%)
Measure 2	An initiative providing public assistance to sufferers of tuberculosis below a certain income level	Yes	176,872 (56.98%)	133,516 (43.02%)
Measure 3	A constitutional amendment limiting tax rates based on the size of a town	No	60,228 (17.52%)	283,583 (82.48%)
Measure 4	A constitutional amendment allowing the General Assembly to establish an income tax	No	67,155 (20.40%)	262,022 (79.60%)
Measure 5	A constitutional amendment providing a pension of $45 a month to the elderly (equivalent to $988 in 2023)	Yes	239,289 (64.04%)	134,377 (35.96%)
Measure 6	An initiative modifying the laws relating to worker's compensation	Yes	203,195 (63.91%)	114,733 (36.09%)
Measure 7	A constitutional amendment allowing women to serve on juries	No	129,872 (41.35%)	184,204 (58.65%)
Measure 8	A constitutional amendment allowing the general assembly to establish a graduated income tax	Yes	167,268 (51.24%)	159,143 (48.76%)
Measure 9	A constitutional amendment exempting churches, schools, and cemeteries from property tax	Yes	227,254 (67.16%)	111,123 (32.84%)

1938

Ballot Measures from 1938

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment giving healthcare practitioners the authority to self-regulate	No	94,846 (23.13%)	315,174 (76.87%)
Measure 2	A constitutional amendment repealing the $45 a month pension and granting the legislature authority to set pensions	No	157,975 (36.52%)	274,598 (63.48%)
Measure 3	An initiative repealing the license fees for chain stores	No	167,109 (38.70%)	264,700 (61.30%)

1940

Ballot Measures from 1940

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment establishing property tax on all intangible property	No	50,806 (10.35%)	440,202 (89.65%)
Measure 2	An initiative to establish a racing commission to oversee horse and dog racing	No	203,195 (42.28%)	277,392 (57.72%)
Measure 3	A constitutional amendment establishing a game and fish commission	No	196,907 (41.92%)	272,768 (58.08%)
Measure 4	A constitutional amendment modifying the General Assembly's ability relating to income taxes	No	81,787 (18.26%)	366,049 (81.74%)
Measure 5	A constitutional amendment lowering the elderly's pension to $30 a month (equivalent to $652 in 2023)	No	138,383 (27.85%)	358,582 (72.15%)

1942

Ballot Measures from 1942

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment limiting the session length of General Assembly meetings	No	72,147 (49.49%)	73,648 (50.51%)

1944

Ballot Measures from 1944

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment allowing women to serve on juries	Yes	195,793 (60.65%)	127,057 (39.35%)
Measure 2	A constitutional amendment allowing some foreigners the ability to purchase property	No	173,652 (47.01%)	195,752 (52.99%)
Measure 3	An initiative appropriating $1,500,000 in funding for old age pensions (equivalent to $25,962,193 in 2023)	Yes	195,793 (60.65%)	127,057 (39.35%)
Measure 4	A constitutional amendment granting veterans and their widows preference in the civil service	Yes	256,563 (70.55%)	107,100 (29.45%)

1946

Ballot Measures from 1946

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment allowing for secret ballots	Yes	118,470 (56.23%)	92,203 (43.77%)
Measure 2	A constitutional amendment requiring that any balance in the state pension fund roll-over each year	No	96,787 (36.38%)	169,243 (63.62%)

1948

Ballot Measures from 1948

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment reorganizing the Colorado Department of Education	Yes	238,100 (65.03%)	128,054 (34.97%)
Measure 2	An initiative establishing regulations for animal racing	Yes	238,371 (56.50%)	183,292 (43.50%)
Measure 3	A constitutional amendment allowing localities to prohibit alcohol	No	334,331 (73.46%)	120,799 (26.54%)
Measure 4	A constitutional amendment increasing the old age pension to $55 a month (equivalent to $697 in 2023)	No	120,799 (26.54%)	334,331 (73.46%)

1950-1999

1950

Ballot Measures from 1950

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment modifying home rule for some localities	Yes	145,780 (61.39%)	91,700 (38.61%)
Measure 2	A constitutional amendment modifying some rules relating to the General Assembly	Yes	134,048 (58.09%)	96,709 (41.91%)
Measure 3	A constitutional amendment exempting some members of executive departments from the civil service	No	103,848 (33.26%)	208,408 (66.74%)

1952

Ballot Measures from 1952

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	A constitutional amendment modifying salaries and retirement procedures for judges	Yes	223,365 (58.28%)	159,883 (41.72%)
Measure 2	A constitutional amendment modifying public utilities regulations	No	173,652 (46.01%)	203,732 (53.99%)
Measure 3	A constitutional amendment exempting some forms of property from tax	No	96,584 (25.67%)	279,682 (74.33%)
Measure 4	A constitutional amendment creating a severance tax on some gas products	No	177,125 (35.96%)	315,392 (64.04%)
Measure 5	An initiative prohibiting firefighters from working more than 60 hours a week	No	169,126 (38.84%)	266,275 (61.16%)
Measure 6	A constitutional amendment legalizing slot machines	No	152,570 (31.98%)	324,548 (68.02%)

1954

Ballot Measures from 1954

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment granting the public utilities commission regulatory authority	Yes	229,175 (64.90%)	123,932 (35.10%)
Amendment 2	A constitutional amendment excluding the Director of the Water Conservation Board from civil service	No	133,073 (45.44%)	159,800 (54.56%)
Amendment 3	A constitutional amendment setting elected state officials terms at four years	No	123,112 (44.18%)	155,539 (55.82%)
Amendment 4	A constitutional amendment requiring income deductions from old age pensions	No	104,079 (31.73%)	223,965 (68.27%)
Amendment 5	A constitutional amendment reapportioning the General Assembly	No	116,695 (42.30%)	159,188 (57.70%)
Referendum 6	An initiative allowing for anticipation warrants for highway purposes	Yes	177,697 (57.26%)	132,628 (42.74%)
Amendment 7	A constitutional amendment modifying personal property taxation	No	143,486 (49.14%)	148,517 (50.86%)
Amendment 8	A constitutional amendment setting county officials terms at four years	Yes	168,055 (52.63%)	151,271 (47.37%)

1956

Ballot Measures from 1956

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment setting elected state officials terms at four years	Yes	316,611 (62.22%)	192,267 (37.78%)
Amendment 2	A constitutional amendment exempting some personal effects from taxation	Yes	320,134 (61.97%)	196,423 (38.03%)
Amendment 3	A constitutional amendment modifying the merit system for civil service	No	156,077 (31.82%)	334,498 (68.18%)
Amendment 4	A constitutional amendment reapportioning the General Assembly	No	158,204 (31.18%)	349,195 (68.82%)
Amendment 5	A constitutional amendment raising the old age pension to $100 a month and means-testing it (equivalent to $1,121 in 2023)	Yes	364,961 (65.72%)	190,366 (34.28%)

1958

Ballot Measures from 1958

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment modifying the civil service to make it more competitive	No	218,426 (48.52%)	231,725 (51.48%)
Amendment 2	A constitutional amendment modifying the salaries for county and precinct officers	No	146,328 (36.65%)	252,903 (63.35%)
Amendment 3	A constitutional amendment modifying county governments	No	158,666 (39.64%)	241,636 (60.36%)
Amendment 4	A constitutional amendment legalizing nonprofit lotteries, bingo games, and raffles	Yes	244,929 (50.98%)	235,482 (49.02%)
Amendment 5	A constitutional amendment establishing rules for labor union membership	No	200,319 (38.61%)	318,480 (61.39%)

1960

Ballot Measures from 1960

Measure name	Description	Passed?	Yes votes	No votes
Proposal 1	A constitutional amendment modifying the civil service	No	214,956 (38.57%)	342,352 (61.43%)
Proposal 2	A constitutional amendment modifying the election process for county officials	No	231,025 (41.31%)	328,241 (58.69%)
Proposal 3	A constitutional amendment creating a department of wildlife conservation	No	190,366 (31.24%)	419,048 (68.76%)
Proposal 4	An initiative establishing daylight saving time	No	280,115 (45.46%)	336,033 (54.54%)
Proposal 5	A constitutional amendment imposing a sales tax on all items except drugs and food	No	200,566 (33.20%)	403,470 (66.80%)
Proposal 7	An initiative exempting some governor appointees from civil service	No	170,736 (28.40%)	430,394 (71.60%)

1962

Ballot Measures from 1962

Measure name	Description	Passed?	Yes votes	No votes
Proposal 1	A constitutional amendment reorganizing the judicial department	Yes	303,740 (64.24%)	169,052 (35.76%)
Proposal 2	A constitutional amendment modifying Denver city and county officers	No	157,249 (38.20%)	254,354 (61.80%)
Proposal 3	A constitutional amendment redefining "income" for state purposes	Yes	231,784 (53.46%)	201,795 (46.54%)
Proposal 4	A constitutional amendment establishing minimum voter qualifications	Yes	303,942 (68.88%)	137,323 (31.12%)
Proposal 5	A constitutional amendment modifying property tax assessment procedures	Yes	215,413 (50.34%)	212,477 (49.66%)
Proposal 6	A constitutional amendment changing term lengths for county officials	No	207,442 (49.83%)	208,867 (50.17%)
Proposal 7	A constitutional amendment reapportioning the General Assembly	Yes	305,700 (63.90%)	172,725 (36.10%)
Proposal 8	A constitutional amendment creating a reapportionment commission	No	149,822 (32.46%)	311,749 (67.54%)

1964

Ballot Measures from 1964

Measure name	Description	Passed?	Yes votes	No votes
Proposal 1	A constitutional amendment creating a state auditor under the legislature	Yes	304,066 (63.71%)	173,221 (36.29%)
Proposal 2	A constitutional amendment allowing voters to abolish their County Superintendent's office	Yes	308,049 (63.38%)	177,967 (36.62%)

1966

Ballot Measures from 1966

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment limiting the number of executive departments at the state level to no more than 20	Yes	369,366 (69.51%)	162,038 (30.49%)
Amendment 2	A constitutional amendment creating an ownership tax on motor vehicles	Yes	318,102 (60.10%)	211,177 (39.90%)
Amendment 3	A constitutional amendment creating the Colorado Commission on Judicial Qualifications	Yes	293,771 (52.90%)	261,558 (47.10%)
Amendment 4	A constitutional amendment establishing a 35 member Senate and a 65 member House of Representatives	Yes	374,884 (70.34%)	158,067 (29.66%)
Amendment 5	A constitutional amendment establishing a limit on property tax increases	No	178,245 (31.55%)	386,650 (68.45%)
Referred Law 1	An initiative establishing daylight saving time	Yes	346,274 (57.26%)	258,490 (42.74%)
Refereed Law 2	An initiative abolishing the death penalty	No	193,245 (33.15%)	389,707 (66.85%)

1968

Ballot Measures from 1968

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment requiring the Governor and Lieutenant Governor be elected jointly	Yes	428,522 (67.73%)	204,186 (32.27%)
Amendment 2	A constitutional amendment exempting some property from taxation	No	284,404 (47.93%)	308,915 (52.07%)
Amendment 3	A constitutional amendment modifying the salaries of county officials	Yes	307,356 (51.50%)	288,873 (48.50%)

1970

Ballot Measures from 1970

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment exempting department heads from civil service	Yes	293,621 (57.21%)	219,639 (42.89%)
Amendment 2	A constitutional amendment modifying the merit system for state employment	Yes	346,663 (66.40%)	175,076 (33.60%)
Amendment 3	A constitutional amendment allowing counties to have home rule	Yes	325,512 (65.56%)	170,986 (34.44%)
Amendment 4	A constitutional amendment reducing the age and residency requirements for voting	No	240,622 (45.19%)	291,858 (54.81%)
Amendment 5	A constitutional amendment modifying residency requirements for voting	Yes	336,977 (64.60%)	184,694 (35.40%)

1972

Ballot Measures from 1972

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	An initiative to legalize sweepstakes races	No	408,704 (49.49%)	417,149 (50.51%)
Measure 2	A constitutional amendment creating a state student loan program	Yes	443,660 (54.13%)	375,948 (45.87%)
Measure 3	A constitutional amendment codifying a right to gender equality	Yes	531,415 (64.28%)	295,254 (35.72%)
Measure 4	A constitutional amendment modifying the structure of the University of Colorado's Board of Regents	Yes	418,825 (52.00%)	386,645 (48.00%)
Measure 5	A constitutional amendment allowing the salaries of elected officials to change while they are in office	No	233,678 (29.04%)	571,083 (70.96%)
Measure 6	A constitutional amendment allowing for a private lottery hosted by the United States Sweepstakes Corporation	No	161,281 (19.93%)	647,817 (80.06%)
Measure 7	A constitutional amendment limiting property taxes	No	192,913 (23.53%)	627,007 (76.47%)
Measure 8	A constitutional amendment preventing the state from instituting new taxes or loaning money for the 1976 Winter Olympics	Yes	514,228 (59.44%)	350,964 (40.56%)
Measure 9	An initiative instituting new transparency requirements for public officials	Yes	491,073 (60.11%)	325,819 (39.89%)
Measure 10	An initiative creating a regulatory agency to govern utility rates	No	350,264 (42.80%)	468,154 (57.20%)
Measure 11	An initiative requiring drivers to hold vehicle insurance	No	208,155 (25.89%)	595,887 (74.11%)
Measure 12	A constitutional amendment limiting property taxes	No	167,882 (21.09%)	628,201 (78.91%)

1974

Ballot Measures from 1974

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment requiring county territory changes be approved by voters	Yes	409,174 (48.35%)	292,040 (41.65%)
Amendment 2	An initiative imposing the death penalty on people convicted of class 1 felonies	Yes	451,403 (61.15%)	286,805 (38.85%)
Amendment 3	A constitutional amendment requiring regular reports by the State Treasurer	Yes	425,505 (63.26%)	247,141 (36.74%)
Amendment 4	A constitutional amendment allowing localities to invest in energy sector corporations	Yes	481,513 (82.75%)	100,360 (17.25%)
Amendment 5	A constitutional amendment creating a commission to govern Denver's growth	Yes	397,442 (61.17%)	252,256 (38.83%)
Amendment 6	A constitutional amendment modifying the functions of the executive and legislative departments	Yes	386,284 (59.96%)	257,967 (40.04%)
Amendment 7	A constitutional amendment modifying the aviation fuel tax	Yes	375,390 (56.13%)	293,430 (43.87%)
Amendment 8	A constitutional amendment prohibiting forced busing	Yes	485,536 (68.74%)	220,842 (31.26%)
Amendment 9	A constitutional amendment creating the Colorado Reapportionment Commission	Yes	386,725 (60.20%)	255,725 (39.80%)
Amendment 10	A constitutional amendment requiring voter approval before nuclear detonations	Yes	399,818 (57.85%)	291,284 (42.15%)

1976

Ballot Measures from 1976

Measure name	Description	Passed?	Yes votes	No votes
Measure 1	An initiative authorizing some sweepstakes races	Yes	522,068 (50.53%)	511,135 (49.47%)
Measure 2	A constitutional amendment modifying the way motor vehicles are categorized for tax purposes	Yes	627,562 (61.75%)	388,666 (38.25%)
Measure 3	A constitutional amendment requiring a two-thirds vote in the legislature before the construction of a nuclear power plant	No	305,142 (29.34%)	734,843 (70.66%)
Measure 4	A constitutional amendment exempting some state government officials from the standard personnel system	No	237,853 (23.63%)	768,687 (76.37%)
Measure 5	A constitutional amendment allowing county commissioners to modify other elected official's salaries	No	376,386 (37.43%)	629,136 (62.57%)
Measure 6	A constitutional amendment revoking the right to gender equality	No	401,943 (38.99%)	629,060 (61.01%)
Measure 7	An initiative exempting food from sales tax	No	406,311 (38.87%)	639,058 (61.13%)
Measure 8	An initiative requiring the recycling of beverage containers	No	346,335 (33.03%)	702,292 (66.97%)
Measure 9	An initiative creating a department to represent public utility customers in government meetings	No	304,594 (39.97%)	711,627 (70.03%)
Measure 10	A constitutional amendment requiring voter approval of all taxes	No	259,201 (25.25%)	767,157 (74.75%)

1978

Ballot Measures from 1978

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment clarifying the procedure for replacing county commissioners who resign during their term	Yes	442,071 (66.13%)	226,432 (33.87%)
Amendment 2	A constitutional amendment limiting state spending	No	295,616 (41.27%)	420,759 (58.73%)

1980

Ballot Measures from 1980

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment requiring that measure petition signers also be registered voters	Yes	638,731 (60.14%)	423,322 (39.86%)
Amendment 2	A constitutional amendment creating a state-run lottery	Yes	660,213 (59.83%)	443,289 (40.17%)
Amendment 3	A constitutional amendment allowing towns and cities to annex unincorporated areas with voter approval	Yes	601,302 (56.65%)	460,084 (34.35%)
Amendment 4	A constitutional amendment relating to real estate sales	No	381,821 (33.87%)	745,625 (66.13%)
Amendment 5	A constitutional amendment allowing banks to open additional branches	No	292,323 (25.58%)	850,454 (74.42%)
Amendment 6	A constitutional amendment restructuring the regional transportation district's board	Yes	570,049 (56.17%)	444,902 (43.83%)

1982

Ballot Measures from 1982

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment modifying property tax assessments	Yes	551,334 (65.49%)	290,590 (34.51%)
Amendment 2	A constitutional amendment allowing bail to be denied to people accused of capital offenses	Yes	737,813 (82.52%)	156,336 (17.48%)
Amendment 3	A constitutional amendment establishing a system for judicial discipline	Yes	659,905 (77.33%)	193,425 (22.67%)
Amendment 4	A constitutional amendment modifying some legislative procedures	Yes	442,601 (54.27%)	372,897 (45.73%)
Amendment 5	An initiative requiring beverage containers to have a minimum refund value	No	242,653 (25.51%)	708,564 (75.45%)
Amendment 6	A constitutional amendment ending nuclear weapons production	No	325,985 (36.60%)	564,606 (63.40%)
Amendment 7	An initiative allowing grocery stores to sell wines with alcohol contents below 14%	No	333,467 (35.00%)	620,190 (65.00%)

1984

Ballot Measures from 1984

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment creating the office of the Commissioner of Insurance	Yes	641,587 (58.81%)	449,362 (41.19%)
Amendment 2	A constitutional amendment requiring voter registration for all election types	Yes	811,130 (72.73%)	304,208 (27.27%)
Amendment 3	A constitutional amendment prohibiting the use of state funds for abortion	Yes	627,343 (50.39%)	617,637 (49.61%)
Amendment 4	An initiative allowing voter registration alongside driver's license applications	Yes	705,725 (61.18%)	447,803 (38.82%)
Amendment 5	A constitutional amendment allowing some forms of casino gambling	No	406,989 (33.18%)	819,533 (66.82%)

1986

Ballot Measures from 1986

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment modifying the merit system for state employment	No	461,004 (48.57%)	488,226 (51.43%)
Amendment 2	A constitutional amendment allowing county commissioners to modify other elected officials salaries	No	406,960 (45.24%)	492,511 (54.76%)
Amendment 3	A constitutional amendment requiring that home rule municipalities abide by an initiative and referendum system	Yes	455,053 (53.42%)	396,738 (46.58%)
Amendment 4	A constitutional amendment preventing new taxes without voter approval	No	375,097 (37.50%)	625,158 (62.50%)

1988

Ballot Measures from 1988

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment making English the official state language	Yes	829,617 (61.15%)	527,053 (38.85%)
Amendment 2	A constitutional amendment modifying expenses reimbursements	Yes	645,002 (53.93%)	551,118 (46.07%)
Amendment 3	A constitutional amendment restricting General Assembly sessions to no more than 120 days	Yes	641,363 (52.33%)	584,359 (47.77%)
Amendment 4	A constitutional amendment creating an eight-hour workday, modifying age qualifications to vote, and repealing some obsolete provisions	Yes	799,250 (67.21%)	389,906 (32.79%)
Amendment 5	A constitutional amendment exempting some forms of property from taxation	Yes	624,021 (51.90%)	578,295 (48.10%)
Amendment 6	A constitutional amendment requiring voter approval for new taxes	No	567,884 (42.19%)	778,075 (57.81%)
Amendment 7	A constitutional amendment allowing state funds to be used for abortion	No	534,070 (39.76%)	809,078 (60.24%)
Amendment 8	A constitutional amendment modifying some General Assembly procedures	Yes	852,448 (71.96%)	332,159 (28.04%)

1990

Ballot Measures from 1990

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment requiring voter approval for some tax increases	No	494,934 (48.93%)	516,534 (51.07%)
Amendment 2	A referendum modifying the presidential primary system	Yes	582,835 (61.16%)	370,166 (38.84%)
Amendment 3	A constitutional amendment repealing some obsolete provisions	Yes	717,544 (77.84%)	204,294 (22.16%)
Amendment 4	A constitutional amendment allowing limited gambling in Black Hawk, Central, and Cripple Creek cities	Yes	574,620 (57.31%)	428,096 (42.39%)
Amendment 5	A constitutional amendment instituting term limits for most statewide elected officials	Yes	708,975 (70.99%)	289,664 (29.01%)

1992

Ballot Measures from 1992

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment establishing a Taxpayer Bill of Rights (TABOR)	Yes	812,308 (53.68%)	700,906 (46.32%)
Amendment 2	A constitutional amendment prohibiting local governments for granted protected status to sexual orientation	Yes	813,966 (53.41%)	710,151 (46.59%)
Amendment 3	A constitutional amendment authorizing some forms of gambling in a variety of cities and counties	No	448,779 (29.74%)	1,060,168 (70.26%)
Amendment 4	A constitutional amendment authorizing some forms of gambling in a variety of cities and counties	No	414,699 (27.61%)	1,087,136 (72.39%)
Amendment 5	A constitutional amendment authorizing some forms of gambling in Parachute	No	414,489 (27.59%)	1,087,713 (72.41%)
Amendment 6	An initiative requiring state-wide educational standards, testing, and implementing a wide variety of school funding reforms	No	693,231 (45.61%)	826,787 (54.39%)
Amendment 7	A constitutional amendment creating a voucher program for schools	No	503,162 (33.21%)	1,011,901 (55.79%)
Amendment 8	A constitutional amendment creating the Great Outdoors Colorado Program	Yes	876,424 (58.20%)	629,490 (41.80%)
Amendment 9	A constitutional amendment allowing limited gambling in the Central Platte Valley	No	292,961 (19.62%)	1,200,336 (80.38%)
Amendment 10	An initiative banning the use of bait and dogs in black bear hunting	Yes	1,054,032 (69.70%)	458,260 (30.30%)
Referendum A	A constitutional amendment establishing victim rights	Yes	1,139,427 (80.18%)	281,731 (19.82%)
Referendum B	A constitutional amendment repealing some obsolete provisions	Yes	1,081,463 (78.02%)	304,718 (21.98%)
Referendum C	A constitutional amendment allowing for limited gambling in localities with voter approval	Yes	1,075,649 (76.01%)	339,521 (23.99%)

1993

Ballot Measures from 1993

Measure name	Description	Passed?	Yes votes	No votes
Referendum A	An initiative establishing a sales tax on tourist-related items for the purpose of funding tourism marketing	No	274,989 (44.82%)	338,546 (55.18%)

1994

Ballot Measures from 1994

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment increasing the cigarette tax rate to 50%	No	429,847 (38.53%)	685,860 (61.47%)
Amendment 11	A constitutional amendment increasing the benefits of worker's compensation insurance	No	369,741 (33.59%)	730,963 (66.41%)
Amendment 12	A constitutional amendment substantially modifying campaign contribution rules	No	246,723 (22.53%)	848,140 (77.47%)
Amendment 13	A constitutional amendment allowing airports to host slot machines and allowing limited gambling in Manitou Springs	No	90,936 (8.28%)	1,007,557 (91.72%)
Amendment 15	A constitutional amendment requiring that at least 60% of candidate contributions come from individuals rather than organizations	No	508,029 (46.35%)	588,072 (53.65%)
Amendment 16	A constitutional amendment preventing the state judiciary from restricting freedom of speech past existing federal precedent	No	404,156 (36.73%)	696,040 (63.27%)
Amendment 17	A constitutional amendment placing term limits on a variety of public offices	Yes	554,238 (51.05%)	531,521 (48.95%)
Amendment 18	A constitutional amendment relating to financial responsibility for medical assistance	No	334,029 (31.85%)	714,653 (68.15%)
Referendum A	A constitutional amendment requiring that ballot measures placed via petition be confined to a single-subject	Yes	687,527 (65.68%)	359,298 (34.32%)
Referendum B	A constitutional amendment requiring the publication of a nonpartisan voter information pamphlet every election	Yes	529,749 (50.44%)	520,438 (49.56%)
Referendum C	A constitutional amendment denying bail to people accused of violent felonies	Yes	822,632 (76.93%)	246,726 (23.07%)

1995

Ballot Measures from 1995

Measure name	Description	Passed?	Yes votes	No votes
Referendum A	A referendum allowing the state to incur debt for the purposes of funding prisons	No	291,736 (45.11%)	355,031 (54.89%)

1996

Ballot Measures from 1996

Measure name	Description	Passed?	Yes votes	No votes
Amendment 11	A constitutional amendment eliminating many property tax exemptions	No	242,543 (16.68%)	1,211,637 (83.32%)
Amendment 12	A constitutional amendment setting term limits for many public offices and proposing a federal amendment to the same effect	Yes	768,257 (54.01%)	654,124 (45.99%)
Amendment 13	A constitutional amendment modifying the ballot measure process	No	435,995 (31.07%)	967,266 (68.93%)
Amendment 14	A constitutional amendment prohibiting leghold traps, body-gripping traps, poisons, and snares for hunting	Yes	752,413 (52.10%)	691,733 (47.90%)
Amendment 15	An initiative limiting political campaign contributions	Yes	928,148 (65.79%)	482,551 (34.21%)
Amendment 16	A constitutional amendment modifying some rules relating to state lands held in trust	Yes	708,502 (51.92%)	656,095 (48.08%)
Amendment 17	A constitutional amendment specifying that parents have the right to control their children's upbringing, education, values, and discipline	No	615,202 (42.35%)	837,606 (57.65%)
Amendment 18	A constitutional amendment allowing some forms of gambling in Trinidad	No	440,173 (31.46%)	958,991 (68.54%)
Referendum A	A constitutional amendment requiring that proposed constitutional amendments reach a 60% vote threshold to pass	No	544,543 (40.89%)	787,134 (59.11%)
Referendum B	A constitutional amendment lengthening the time between the mailing of voter information pamphlets and ballots	Yes	739,435 (54.87%)	608,219 (45.13%)
Referendum C	A constitutional amendment authorizing the General Assembly to regulate county sheriff's offices	Yes	754,339 (56.10%)	590,402 (43.90%)
Referendum D	A constitutional amendment modifying unemployment compensation insurance	No	376,860 (29.32%)	908,476 (70.68%)

1997

Ballot Measures from 1997

Measure name	Description	Passed?	Yes votes	No votes
Amendment 1	A constitutional amendment raising the fuel tax and vehicle registration fees for the purpose of funding the Transportation Department	No	109,663 (15.79%)	585,055 (84.21%)

1998

Ballot Measures from 1998

Measure name	Description	Passed?	Yes votes	No votes
Amendment 11	A constitutional amendment prohibiting partial-birth abortions	No	617,977 (48.52%)	617,977 (51.48%)
Amendment 12	An initiative requiring parental notification before an abortion is performed on an emancipated minor	Yes	707,021 (54.87%)	581,481 (45.13%)
Amendment 13	A constitutional amendment requiring uniform application of livestock laws	No	475,664 (38.70%)	753,509 (61.30%)
Amendment 14	An initiative increasing regulations of commercial hog farms	Yes	790,825 (64.21%)	440,766 (35.79%)
Amendment 15	An initiative requiring that water flow meters in the San Luis Valley be certified by the state engineer	No	292,977 (23.83%)	936,698 (76.17%)
Amendment 16	A constitutional amendment instituting fees on water pumped from state lands in the Rio Grande Water Conservation District	No	297,872 (24.23%)	931,566 (75.77%)
Amendment 17	A constitutional amendment granting a tax credit to the parents of schoolchildren	No	515,942 (39.72%)	782,982 (60.28%)
Amendment 18	A constitutional amendment allowing candidates for public office to submit declarations of voluntary term limits	Yes	613,557 (50.41%)	603,651 (49.59%)
Referendum A	A constitutional amendment relating to healthcare	No	505,903 (45.32%)	610,449 (54.68%)
Referendum B	An initiative allowing the state to hold up to $200,000,000 in excess tax revenue for the purpose of funding school construction and transportation (equivalent to $373,866,884 in 2023)	No	477,504 (38.41%)	765,654 (61.59%)
Referendum C	A constitutional amendment creating the city and county of Broomfield	Yes	670,781 (61.29%)	423,603 (38.71%)

1999

Ballot Measures from 1999

Measure name	Description	Passed?	Yes votes	No votes
Referendum A	A referendum allowing the state to take on additional debt for the purpose of funding transportation projects	Yes	477,982 (61.68%)	296,971 (38.32%)

2000-

2000

Ballot Measures from 2000

Measure name	Description	Passed?	Yes votes	No votes
Amendment 20	A constitutional amendment legalizing medical marijuana	Yes	915,527 (53.53%)	786,983 (46.47%)
Amendment 21	A constitutional amendment introducing small tax cuts	No	569,788 (33.98%)	1,107,155 (66.02%)
Amendment 22	An initiative requiring background checks on gun purchases at gun shows	Yes	1,197,593 (70.05%)	512,084 (39.95%)
Amendment 23	A constitutional amendment modifying public school funding	Yes	882,628 (52.71%)	791,934 (47.29%)
Amendment 24	A constitutional amendment requiring voter approval for local government development plans	No	511,885 (30.11%)	1,888,138 (69.89%)
Amendment 25	A constitutional amendment requiring a 24-hour waiting period before abortions	No	664,420 (39.44%)	1,020,029 (60.56%)
Referendum A	A constitutional amendment establishing a homestead tax exemption for senior citizens	Yes	843,620 (54.74%)	697,398 (45.26%)
Referendum B	A constitutional amendment modifying the timeframe for adoption of a redistricting plan for the General Assembly	Yes	852,098 (60.48%)	556,769 (39.52%)
Referendum C	A constitutional amendment modifying the selection process for county surveyors	No	661,704 (45.45%)	794,310 (54.55%)
Referendum D	A constitutional amendment removing some outdated provisions	Yes	1,063,345 (71.56%)	422,629 (28.44%)
Referendum E	An initiative allowing Colorado to enter multi-state lotteries	Yes	836,390 (51.64%)	783,275 (48.36%)
Referendum F	An initiative allowing the state to utilize excess state revenues for the purpose of funding school performance grants	No	697,673 (44.11%)	887,947 (55.89%)

2001

Ballot Measures from 2001

Measure name	Description	Passed?	Yes votes	No votes
Amendment 26	An initiative allowing the state to spend $50,000,000 for the purpose of improving I-70 (equivalent to $86,036,459 in 2023)	No	283,184 (34.10%)	547,213 (65.90%)
Referendum A	An initiative increasing the outdoor recreation trust fund by $115,000,000 (equivalent to $197,883,856 in 2023)	Yes	478,501 (57.58%)	352,585 (42.42%)

2002

Ballot Measures from 2002

Measure name	Description	Passed?	Yes votes	No votes
Amendment 27	A constitutional amendment limiting corporation and labor union contributions to political campaigns	Yes	890,390 (66.50%)	448,599 (33.50%)
Amendment 28	An initiative requiring voting by mail	No	557,573 (42.41%)	757,299 (57.59%)
Amendment 29	An initiative substantially modifying the candidate selection process for primary elections	No	509,109 (39.84%)	768,683 (60.14%)
Amendment 30	A constitutional amendment allowing same-day voter registration	No	530,442 (39.25%)	821,050 (60.75%)
Amendment 31	A constitutional amendment prohibiting bilingual education in most circumstances	No	608,264 (43.78%)	781,016 (56.22%)
Referendum A	A constitutional amendment eliminating term limits for district attorneys	No	461,848 (35.27%)	847,602 (64.73%)
Referendum B	A constitutional amendment allowing localities to co-own healthcare facilities with private companies	No	510,209 (40.76%)	741,568 (59.24%)
Referendum C	A constitutional amendment allowing the General Assembly to regulate the position of county coroner	Yes	900,611 (70.92%)	369,351 (29.08%)
Referendum D	A constitutional amendment removing some obsolete provisions	Yes	899,914 (71.89%)	351,886 (28.11%)
Referendum E	A referendum establishing March 31 as "Cesar Chavez Day"	No	275,947 (20.61%)	1,062,780 (79.39%)

2003

Ballot Measures from 2003

Measure name	Description	Passed?	Yes votes	No votes
Amendment 32	A constitutional amendment modifying property tax assessment	No	203,449 (22.45%)	702,829 (77.55%)
Amendment 33	A constitutional amendment allowing some limited forms of gambling	No	180,959 (19.09%)	766,893 (80.91%)
Referendum A	An referendum allowing the state to borrow up to $2,000,000,000 to fund water projects (equivalent to $3,312,590,449 in 2023)	No	307,412 (32.87%)	627,716 (67.13%)

2004

Ballot Measures from 2004

Measure name	Description	Passed?	Yes votes	No votes
Amendment 34	A constitutional amendment prohibiting laws which would limit property owner's ability to recover damages from construction projects	No	469,566 (23.45%)	1,533,002 (76.55%)
Amendment 35	A constitutional amendment raising the tobacco tax for the purpose of funding educational and preventive health programs	Yes	1,258,086 (61.38%)	791,627 (38.62%)
Amendment 36	A constitutional amendment allowing Colorado's electoral votes to be distributed proportionally	No	696,770 (34.78%)	1,306,834 (65.22%)
Amendment 37	An initiative requiring that a certain percentage of electricity be generated from renewable sources	Yes	1,066,023 (53.61%)	922,577 (46.39%)
Referendum A	A constitutional amendment substantially modifying the state civil service system	No	696,007 (39.19%)	1,080,136 (60.81%)
Referendum B	A constitutional amendment removing some obsolete provisions relating to education	Yes	1,247,998 (69.00%)	560,811 (31.00%)

2005

Ballot Measures from 2005

Measure name	Description	Passed?	Yes votes	No votes
Referendum C	An initiative allowing the state to spend money collected over the TABOR limit on health care, public education, transportation, and fire and police projects	Yes	600,222 (52.06%)	552,662 (47.94%)
Referendum D	An initiative allowing the state to borrow up to $2,000,720,000 (equivalent to $3,121,245,923 in 2023)	No	567,540 (49.38%)	581,751 (50.62%)

2006

Ballot Measures from 2006

Measure name	Description	Passed?	Yes votes	No votes
Amendment 38	A constitutional amendment expanding the ability for citizens to place measures on the ballot	No	456,468 (30.67%)	1,027,550 (69.24%)
Amendment 39	A constitutional amendment requiring that 65% of school district budgets be allocated towards classroom instruction	No	569,483 (37.61%)	944,735 (62.39%)
Amendment 40	A constitutional amendment introducing term limits for judges in the Colorado Supreme Court and Colorado Court of Appeals	No	648,199 (42.91%)	862,349 (57.09%)
Amendment 41	A constitutional amendment prohibiting elected officials and their family members from accepting gifts and restricting former elected official's abilities to become lobbyists	Yes	938,888 (62.57%)	561,646 (37.43%)
Amendment 42	A constitutional amendment increasing the minimum wage and tying it to inflation	Yes	823,526 (53.30%)	721,530 (46.70%)
Amendment 43	A constitutional amendment prohibiting same-sex marriages	Yes	855,126 (55.02%)	699,030 (44.98%)
Amendment 44	An initiative legalizing the possession of marijuana in small amounts	No	636,938 (41.08%)	913,411 (58.92%)
Referendum E	A constitutional amendment providing a property tax exemption to some disabled veterans	Yes	1,195,907 (79.24%)	313,292 (20.76%)
Referendum F	A constitutional amendment removing some deadlines relating to recall elections	No	626,015 (44.68%)	775,207 (55.32%)
Referendum G	A constitutional amendment eliminating some obsolete provisions	Yes	1,092,293 (76.08%)	343,495 (23.92%)
Referendum H	An initiative relating to the income tax deduction limit	Yes	744,475 (50.74%)	722,651 (49.26%)
Referendum I	An initiative granting same-sex couples the same rights as other domestic partnerships	No	734,385 (47.65%)	806,717 (52.35%)
Referendum J	An initiative requiring that school districts spend at least 65% of their budget on student achievement-related services	No	620,790 (41.53%)	874,151 (58.47%)
Referendum K	An initiative requiring the Attorney General of Colorado to engage in a lawsuit against the United States to force the enforcement of existing immigration laws	Yes	830,628 (55.72%)	660,012 (44.28%)

2008

Ballot Measures from 2008

Measure name	Description	Passed?	Yes votes	No votes
Amendment 46	A constitutional amendment prohibiting discrimination and preferential treatment in public employment, education, and contracting	No	1,102,046 (49.19%)	1,138,134 (50.81%)
Amendment 47	A constitutional amendment prohibition union contracts which require employees to pay fees to stay employed	No	1,003,056 (43.89%)	1,282,501 (56.11%)
Amendment 48	A constitutional amendment defining personhood as beginning at conception	No	618,779 (26.79%)	1,691,237 (73.21%)
Amendment 49	A constitutional amendment prohibiting public employers from using payroll deductions to benefit private organizations	No	882,428 (39.24%)	1,366,620 (60.76%)
Amendment 50	A constitutional amendment allowing some forms of gambling in Central, Black Hawk, and Cripple Creek cities	Yes	1,330,566 (58.70%)	936,254 (41.30%)
Amendment 51	A constitutional amendment increasing the sales tax for the purpose of funding services for the developmentally disabled	No	853,211 (37.63%)	1,414,065 (62.37%)
Amendment 52	A constitutional amendment creating a trust fund for highway development	No	790,124 (35.78%)	1,418,009 (64.22%)
Amendment 54	A constitutional amendment limiting campaign contributions from government contract holders	Yes	1,130,098 (51.21%)	1,076,694 (48.79%)
Amendment 58	An initiative modifying the severance tax	No	944,191 (41.95%)	1,306,782 (58.05%)
Amendment 59	A constitutional amendment relating to education funding and rebates	No	1,010,409 (45.69%)	1,201,220 (54.31%)
Referendum L	A constitutional amendment lowering the age requirement to serve as a General Assembly member to 21	No	1,010,896 (46.50%)	1,162,296 (53.50%)
Referendum M	A constitutional amendment eliminating some obsolete provisions relating to land value increases	Yes	1,307,770 (62.26%)	792,678 (37.74%)
Referendum N	A constitutional amendment eliminating some obsolete provisions relating to alcohol	Yes	1,449,383 (68.75%)	658,684 (31.25%)
Referendum O	A constitutional amendment modifying the requirements to place ballot measures on the ballot	No	1,004,925 (47.50%)	1,110,877 (52.50%)

2010

Ballot Measures from 2010

Measure name	Description	Passed?	Yes votes	No votes
Amendment P	A constitutional amendment transferring regulatory power over gambling from the Department of State to the Department of Revenue	No	611,664 (37.67%)	1,012,193 (62.33%)
Amendment Q	A constitutional amendment establishing some government continuity procedures	Yes	944,446 (57.52%)	697,373 (42.48%)
Amendment R	A constitutional amendment eliminating property taxes for some owners	No	616,516 (38.34%)	991,347 (61.66%)
Amendment 60	A constitutional amendment limiting property tax increases	No	427,912 (24.50%)	1,318,507 (75.50%)
Amendment 61	A constitutional amendment prohibiting state and local governments from borrowing money without voter approval	No	474,772 (26.99%)	1,284,307 (73.01%)
Amendment 62	A constitutional amendment defining personhood as beginning at conception	No	509,062 (29.47%)	1,218,490 (70.53%)
Amendment 63	A constitutional amendment preventing the establishment of a universal healthcare system	No	800,155 (46.90%)	905,944 (53.10%)
Proposition 101	An initiative substantially reforming the motor vehicle, income, and telecom taxes	No	564,588 (32.31%)	1,183,000 (67.69%)
Proposition 102	An initiative allowing first-time offenders of nonviolent misdemeanors to be released pretrial without bail	No	636,444 (38.03%)	1,037,103 (61.97%)

2011

Ballot Measures from 2011

Measure name	Description	Passed?	Yes votes	No votes
Proposition 103	An initiative increasing the state income and sales tax	No	349,746 (36.30%)	611,907 (63.60%)

2012

Ballot Measures from 2012

Measure name	Description	Passed?	Yes votes	No votes
Amendment 64	A constitutional amendment legalizing marijuana	Yes	1,383,139 (55.32%)	1,116,894 (44.68%)
Amendment 65	A constitutional amendment relating to corporate contributions to political campaigns	Yes	1,762,515 (74.01%)	619,073 (25.99%)
Amendment S	A constitutional amendment modifying the state personnel system	Yes	1,276,405 (56.35%)	988,541 (43.65%)

2013

Ballot Measures from 2013

Measure name	Description	Passed?	Yes votes	No votes
Proposition AA	An initiative imposing several new taxes on marijuana sales for the purpose of funding school construction and marijuana regulation	Yes	902,181 (65.27%)	479,992 (34.73%)
Amendment 66	A constitutional amendment raising some state taxes for the purpose of funding education	No	496,151 (35.54%)	899,927 (64.46%)

2014

Ballot Measures from 2014

Measure name	Description	Passed?	Yes votes	No votes
Amendment 67	A constitutional amendment redefining the terms "person" and "child" to include human fetuses	No	702,544 (35.13%)	1,297,299 (64.87%)
Amendment 68	A constitutional amendment allowing limited gambling at some horse racetracks for the purpose of funding a kindergarten fund	No	597,239 (29.62%)	1,419,095 (70.38%)
Proposition 104	An initiative requiring collective bargaining negotiations for school employees to be open to the public	Yes	1,364,747 (70.09%)	582,473 (29.91%)
Proposition 105	An initiative requiring that food containing GMOs carry a label clearly identifying them as such	No	694,738 (34.53%)	1,317,288 (65.47%)

2015

Ballot Measures from 2015

Measure name	Description	Passed?	Yes votes	No votes
Proposition BB	An initiative allowing the state to retain $66,000,000 in marijuana tax revenues for the purpose of funding school construction projects	Yes	847,380 (69.39%)	373,734 (30.61%)

2016

Ballot Measures from 2016

Measure name	Description	Passed?	Yes votes	No votes
Amendment T	A constitutional amendment prohibiting slavery as a punishment for a crime	No	1,280,037 (49.68%)	1,296,722 (50.32%)
Amendment U	A constitutional amendment exempting some assets from taxation	No	1,103,593 (43.85%)	1,412,923 (56.15%)
Amendment 69	A constitutional amendment creating a universal healthcare system for Colorado residents	No	568,683 (21.23%)	2,109,868 (78.77%)
Amendment 70	A constitutional amendment raising the minimum wage to $12.00 an hour	Yes	1,517,903 (55.36%)	1,224,189 (44.64%)
Amendment 71	A constitutional amendment requiring initiative petitioners to gather signatures in all 35 state senate districts and imposing a 55% vote threshold for future constitutional amendments	Yes	1,476,948 (55.69%)	1,175,324 (44.31%)
Amendment 72	An initiative raising taxes on cigarettes by $1.75	No	1,286,851 (46.94%)	1,454,342 (53.06%)
Proposition 106	An initiative legalizing assisted death	Yes	1,765,786 (64.87%)	956,263 (35.13%)
Proposition 107	An initiative creating an open primary system for presidential elections	Yes	1,701,599 (64.09%)	953,246 (35.91%)
Proposition 108	An initiative allowing unaffiliated electors to vote in primary elections	Yes	1,398,577 (53.27%)	1,227,117 (46.73%)

2018

Ballot Measures from 2018

Measure name	Description	Passed?	Yes votes	No votes
Amendment A	A constitutional amendment prohibiting slavery as a punishment for a crime	Yes	1,599,790 (66.21%)	816,342 (33.79%)
Amendment V	A constitutional amendment lowering the minimum age for state legislators from 25 to 21	No	889,179 (36.19%)	1,567,560 (63.81%)
Amendment W	A constitutional amendment allowing county clerks to consolidate judge retention questions on election ballots	No	1,262,713 (53.81%)	1,083,712 (46.19%)
Amendment X	A constitutional amendment redefining "industrial hemp"	Yes	1,421,630 (60.64%)	922,597 (39.36%)
Amendment Y	A constitutional amendment creating a 12-member redistricting committee for congressional districts	Yes	1,711,008 (71.37%)	686,260 (28.63%)
Amendment Z	A constitutional amendment creating a 12-member redistricting committee for General Assembly districts	Yes	1,687,583 (71.07%)	687,113 (28.93%)
Amendment 73	A constitutional amendment establishing a graduated income tax	No	1,137,527 (46.43%)	1,312,331 (53.57%)
Amendment 74	A constitutional amendment requiring property owners be compensated if their property value decreased due to changes in state law	No	1,139,205 (46.42%)	1,315,182 (53.58%)
Amendment 75	A constitutional amendment allowing candidates in races where a self-funded candidate gives their campaign at least $1,000,000 to accept more than the standard campaign contribution limit	No	813,861 (34.04%)	1,576,835 (65.96%)
Proposition 109	An initiative allowing the state to issue $3,500,000,000 in bonds for the purpose of funding statewide transportation projects	No	952,814 (39.28%)	1,472,933 (60.72%)
Proposition 110	An initiative authorizing the state to issue $6,000,000,000 in bonds for the purpose of funding statewide transportation projects and raising the state sales tax rate	No	990,287 (40.61%)	1,448,535 (59.39%)
Proposition 111	An initiative capping payday loan interest rates	Yes	1,865,200 (77.25%)	549,357 (22.75%)
Proposition 112	An initiative mandating that new fracking projects be at least 2,500 feet from occupied buildings	No	1,116,738 (44.88%)	1,371,284 (55.12%)

2019

Ballot Measures from 2019

Measure name	Description	Passed?	Yes votes	No votes
Proposition CC	An initiative allowing the state to retain excess revenue and direct it towards transportation and education programs	No	724,060 (46.34%)	838,282 (53.66%)
Proposition DD	An initiative legalizing sports betting	Yes	800,745 (51.41%)	756,712 (48.59%)

2020

Ballot Measures from 2020

Measure name	Description	Passed?	Yes votes	No votes
Amendment B	A constitutional amendment repealing the Gallagher Amendment	Yes	1,740,395 (57.52%)	1,285,136 (42.48%)
Amendment C	A constitutional amendment lowering the entry requirements for charitable lotteries	No	1,586,973 (52.35%)	1,444,553 (47.65%)
Amendment 76	A constitutional amendment restricting voting to United States citizens	Yes	1,985,239 (62.90%)	1,171,137 (37.10%)
Amendment 77	A constitutional amendment allowing voters in Central, Black Hawk, and Cripple Creek cities to expand gambling	Yes	1,854,153 (60.54%)	1,208,414 (39.46%)
Proposition EE	An initiative to tax nicotine products for the purpose of funding health and education programs	Yes	2,134,608 (67.56%)	1,025,182 (32.44%)
Proposition 113	A referendum to uphold Colorado's membership in the National Popular Vote Interstate Compact	Yes	1,644,716 (52.33%)	1,498,500 (47.67%)
Proposition 114	An initiative requiring the Colorado Parks and Wildlife Commission to create a management plan for gray wolf populations	Yes	1,590,299 (50.91%)	1,533,313 (49.09%)
Proposition 115	An initiative banning abortions after 22 weeks	No	1,292,787 (41.01%)	1,859,479 (58.99%)
Proposition 116	An initiative decreasing state income tax rates from 4.63% to 4.55%	Yes	1,821,702 (57.86%)	1,327,025 (42.14%)
Proposition 117	An initiative requiring statewide voter approval for some new state enterprises	Yes	1,573,114 (52.55%)	1,420,445 (47.45%)
Proposition 118	An initiative creating a paid family and medical leave program	Yes	1,804,546 (57.75%)	1,320,386 (42.25%)

2021

Ballot Measures from 2021

Measure name	Description	Passed?	Yes votes	No votes
Amendment 78	A constitutional amendment transferring power over custodial funds from the state treasurer to the General Assembly	No	646,983 (43.03%)	856,704 (56.97%)
Proposition 119	An initiative raising the marijuana sales tax for the purpose of funding a Learning Enrichment and Academic Progress Program	No	701,479 (45.75%)	831,670 (54.25%)
Proposition 120	An initiative modifying property tax rates and allowing the state to spend $25,000,000 over the TABOR cap to reimburse localities for lost revenue	No	652,382 (42.96%)	866,197 (57.04%)

2022

Ballot Measures from 2022

Measure name	Description	Passed?	Yes votes	No votes
Amendment D	A constitutional amendment directing the Governor to assign judges to Colorado's 23rd judicial district	Yes	1,502,853 (67.3%)	727,402 (32.6%)
Amendment E	A constitutional amendment extending a property tax exemption to the surviving spouses of deceased military service members	Yes	2,109,453 (87.6%)	298,510 (22.4%)
Amendment F	A constitutional amendment modifying the rules relating to charitable gaming	No	930,361 (40.6%)	1,359,011(59.4%)
Proposition FF	An initiative reducing the income tax deduction for some income brackets for the purpose of funding school meals	Yes	1,394,834(56.7%)	1,055,575 (43.2%)
Proposition GG	An initiative requiring that ballot measures changing income taxes break down their impact by tax bracket	Yes	1,704,744(71.9%)	655,464 (28.0%)
Proposition 121	An initiative decreasing the state income tax rate from 4.55% to 4.40%	Yes	1,581,148(65.2%)	842,499 (34.7%)
Proposition 122	An initiative decriminalizing some psychedelic plants and fungi	Yes	1,269,802(53.6%)	1,121,144 (46.3%)
Proposition 123	An initiative creating a state affordable housing fund	Yes	1,269,802(52.6%)	1,143,964 (47.3%)
Proposition 124	An initiative increasing the number of liquor store licenses any single individual can hold	No	905,554 (37.6%)	1,497,322(62.3%)
Proposition 125	An initiative allowing stores that are licensed to sell beer for off-site consumption to also sell wine for off-site consumption	Yes	1,228,394(50.5%)	1,200,205 (49.4%)
Proposition 126	An initiative allowing stores that are licensed to sell alcohol for off-site consumption to also offer delivery	No	1,182,047 (48.8%)	1,238,063 (51.1%)