The station first signed on December 24, 1968 as KLOM-FM on the 92.7 FM frequency. Originally, the station was owned by Communications Corporation of America and broadcast a middle of the road music format as a simulcast of its AM sister station KLOM (1330 AM, now defunct).[2] On October 9, 1975, Communications Corporation of America sold KLOM-AM-FM to Robert D. Janecek for $200,000.[3]
In April 1979, KLOM-FM changed its call letters to KLPC-FM.[4] Simultaneously, Janecek sold the station pair to D 'n' T Broadcasting Inc., owned by Richard N. Savage, for $1 million.[5] On August 24, 1984, the station switched its call sign to KXCC-FM.[4][6]
On July 16, 1986, Golden Coast Broadcasting Inc. sold KXCC-FM to Broadcast Management Consultants Inc. for $750,000.[7] The new owner changed the station's call letters to KBOX on November 1.[4][8]
In 2000, American General Media took control of KBOX upon closing on its purchase from Broadcast Management Consultants. By 2007, the station adopted an adult hits format under the branding "Pirate Radio".[11]
On January 18, 2010 at 11:30 a.m., high winds in the Santa Maria area triggered a power outage that knocked several stations off the air, including KBOX. The station resumed broadcasting one hour later under generator power.[12]