The station went on the air as KNUW-FM on November 30, 1979. On November 2, 1984, the station changed its call sign to the current KMON.[3]
KMON-HD2
On May 5, 2017, KMON-FM launched an adult alternative format on its HD2 subchannel, branded as "107.5 The Peak" (simulcast on translator K298BL 107.5 FM Great Falls).[4]