In March 1960, the station first signed on as KGMI-FM.[3] It was owned by International Good Music, Inc., serving as the FM counterpart to KGMI (790 AM). The two stations simulcast their programming. It switched to KVGM in 1970.
In 1998, Saga Communications purchased KISM and KGMI for $9.8 million.[5]
HD Radio
KISM's third HD Radio channel carries a classic hits format branded "98.9 K-Bay", in reference to FM translator K255DC (98.9 FM). The "K-Bay" programming had previously been carried on KBAI (930 AM) from 2017 until the AM station's closure 2024.[6]