The station first signed on the air as KRKD on the FM dial on December 8, 1992. Not much else is known about the ownership of the station at the time or what format was played before Big Tree Communications took over ownership in 1997. During that time, the station's call letters were changed to the current KZRO-FM at 100.1 with the city of license being out of Dunsmuir, California. The format for the station was changed to "rockin' oldies", predominantly a rock station to compete with other Siskiyou County radio stations such as KMJC-AM, KMJC-FM, KSYC-AM, KSYC-FM and KWHO-FM.
In 2021, KZRO became the only locally-run radio station in operation as their competing stations either went silent, became satellite radio affiliates or signed off for good within the next decade. KSYC-FM Yreka and KHWA Weed went silent in 2019 but returned to the air in 2022 as Jefferson Public Radio-owned stations joining KSYC-AM Yreka and KMJC-AM Mount Shasta that were already JPR stations; KMJC-FM Mount Shasta became a K-LOVE radio affiliate and changed call letters to KKLC in 2008; local church-owned station KMSJ-LP Mount Shasta signed off for good in 2022 and KSYC-AM Yreka signed off for good in 2024. KZRO continues to serves the Northern California region as Siskiyou County's only local station to this day.
Michaels would acquire the station under his own banner Z-Channel Radio LLC sometime in the 2010's.
The station, with the slogan "We're in it for the music, not the money," features only two commercial breaks per hour 24/7 on weekdays plus 30 hours of weekend syndicated programming (see below).
[WEEKDAYS] 6–10am: The Dennis Michaels Dog And Pony Show includes music features, goofy stories, daily listener emails and requests, The Old Farmer's Almanac, The Prime Comedy Cutand Stupid News. Other daily features include Into Tomorrow with Dave Graveline, Flashback Pop Quiz, A Better Life with Sonjay Gupta, and Lunchtime With The Beatles Monday at noon.
WESTWOOD ONE RADIO NEWS full five minute reports air weekdays at 8am, 10am, noon, 2pm and 5pm. One-minute updates air at the bottom of every hour, 24/7 (weekend times float with programming).
[FRIDAY] noon-Live From The 60s with The Real Don Steele, 5pm-Live in Concert with Lisa Berigan.
[SATURDAY] 6am-The Car Show, 7am-Time Warp with Bill St. James, 11am-Sammy Hagar's Top Rock Countdown, 12 pm-The Acoustic Storm with Audrey Parets, 1pm-The Classic Hit List with MG Kelly and 4pm-The Classics with Steve Downes.
[SUNDAY] 6am-Hot Rod Radio USA with Wings Kalahan, 8am-Goddard's Gold with Steve Goddard, 11am-Off the Record with Uncle Joe Benson, 12 pm-Get The Led Out with Carol Miller, 1pm-Little Steven's Underground Garage with Little Steven Van Zandt, 3pm-Floydian Slip with Craig Bailey and 4pm-Blues Deluxe with Dave Johnson.
Past/present local talent
Michele Cloutier (1997-present, part-time account executive and commercial talent)
Rick Martin (2008-2009, formerly of KWSD/KMJC, KSYC/KYRE, KEDY, KNTK/KCWH/KSIZ)
Kevin Sponsler (2024, formerly of KSYC-AM & FM, now of Siskiyou Country Radio)