KOST 103.5

About KOST 103.5

KOST 103.5 FM is an adult contemporary station licensed to Los Angeles, California, serving Greater Los Angeles and Orange County with a strong regional signal. Owned by iHeartMedia, it has long been a key presence in Southern California radio, especially recognized for its annual switch to an all-Christmas music format during the holiday season. This tradition has helped make KOST one of the most listened-to stations in the market.

The format features a polished mix of current and recurrent pop hits alongside familiar favorites, presented in a smooth, listener-friendly style. The Ellen K Morning Show anchors the weekday lineup, combining music, conversation, and community engagement. Listener interaction, promotions, and charitable initiatives further connect the station with its audience. By blending upbeat adult contemporary music with approachable personalities and seasonal traditions, KOST 103.5 continues to be a top choice for at-work and family listening across Southern California.