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City of license Denver, Colorado
Broadcast area Denver, Colorado
Branding KOSI 101
Slogan Continuous Lite Rock
Frequency 101.1 MHz (also on HD Radio)
First air date 1968
Format Soft AC
HD2: KEZW simulcast
ERP 74,000 watts
HAAT 495 meters
Class C
Facility ID 67844
Callsign meaning Sounds like "cozy"
Owner Entercom Communications
(Entercom License, LLC)
Webcast Listen Live
Website kosi101.com

KOSI is a commercial radio station located in Denver, Colorado, broadcasting on 101.1 FM. KOSI airs a soft adult contemporary music format branded as "KOSI 101". As of 2011, airplay extensively uses radio edit versions of songs; usually 2-3 min of length, and emphasizing the refrain. Its studios are located in the Denver Tech Center district, and the transmitter is on Lookout Mountain near Golden.

HD Programming[edit]

KOSI broadcasts in the HD format.[1]


KOSI-FM signed on in 1968 airing an easy listening/beautiful music format. At the time, it was paired with KOSI 1430 AM. The stations were owned by Bill Armstrong, who would later become a Republican congressman and two term U.S. Senator. Armstrong sold KOSI-FM to Westinghouse Broadcasting in 1981. KOSI-AM then became KEZW in March of that year. In 1988, Westinghouse sold KOSI and KEZW to D&D Broadcasting, Inc. for $15.5 million. [2] By 1990 the format evolved into its current mainstream adult contemporary music format. From 2007 to 2011, KOSI aired the syndicated Delilah radio show. Delilah has since been replaced with local programming.


KOSI is the only radio station in the Denver area to switch its format entirely to Christmas music during the Christmas season. The change generally takes place during the week of Thanksgiving and continues until 12:00 AM on December 26, at which point the format goes back to soft adult contemporary. In 2008 the Christmas music continued until December 27.


External links[edit]

Coordinates: 39°43′45″N 105°14′06″W / 39.72917°N 105.23500°W / 39.72917; -105.23500