It's official! KOST 103.5 will flip the switch to Christmas music next Friday, November 9, 2018. Ellen K made the official announcement on the Ellen K Morning Show and also revealed that superstar Gwen Stefani will be joining the KOST 103.5 Holiday Kick-Off Party to perform and make the official switch to Christmas music! We'll be giving away passes all weekend long so you can be here with us kicking off the holiday music with Santa & Gwen Stefani! Listen to KOST 103.5 FM or the iHeart Radio app! #KOSTCHRISTMAS