KKFN is a commercial radio station serving the Denver-Boulder market. Owned and operated by Salt Lake City–based Bonneville International, KKFN airs a sports radio format. The station is licensed in Longmont, Colorado. Its studios are located in Greenwood Village, and the transmitter is in Lakewood on Green Mountain. KKFN runs local sports shows days and evenings, and carries ESPN Radio programming late nights and weekends.