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KSFI FM 100.3 logo.png
City Salt Lake City, Utah
Broadcast area Salt Lake City-Ogden-Provo, Utah
Branding FM 100.3
Slogan Better Music For A Better Workday
Better Music For A Better Holiday (Nov.-Dec.)
Frequency 100.3 MHz (also on HD Radio)
First air date December 6, 1946; 71 years ago (December 6, 1946) (as KSL-FM)
Format Adult Contemporary
Christmas music (Nov.-Dec.)
ERP 25,000 watts
HAAT 1140 meters
Class C
Facility ID 60452
Callsign meaning K Simmons Family Inc. (Former owners)
Former callsigns KSL-FM (1946–1979)
Owner Bonneville International
(Bonneville International Corporation)
Sister stations KRSP-FM, KSL (AM), KSL-FM, KSL-TV
Webcast Listen Live
Website fm100.com

KSFI is a radio station operating at frequency 100.3 FM in Salt Lake City, Utah, United States. KSFI maintains studio facilities located at the KSL Broadcast House building in Salt Lake City's Triad Center (which also house KRSP-FM and the KSL-AM-FM-TV partners), and its transmitter is located on Farnsworth Peak in the Oquirrh Mountains, southwest of Salt Lake City.

The station's original call letters were KSL-FM when it began broadcasting in December 1946 as the sister station of KSL. Originally owned by the Deseret News, it became a part of Bonneville International when the LDS Church formed it as the parent of its broadcasting outlets in 1964.

"FM 100" was a pioneer of Bonneville's "beautiful music" format, but in 1978 it was sold to Simmons.[1] Simmons changed the call letters in 1979 to KSFI (Simmons Family Incorporated) and began adding more vocal selections to the music mix, eventually evolving the format to soft adult contemporary. Bonneville reacquired the station (along with Star 102.7 and Arrow 103.5) from Simmons in 2003.[1] According to the website of its owner, Bonneville International, FM100 is the top-performing adult contemporary station in Utah.


KSFI 100.3 logo 2015.png


  1. ^ a b Arave, Lynn. "Bonneville purchase of 15 stations OK'd", Deseret News, December 9, 2003. Retrieved February 26, 2017.

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Coordinates: 40°39′32″N 112°12′07″W / 40.659°N 112.202°W / 40.659; -112.202