The station began as an FM simulcast of the then nostalgia KLCY and became the adult contemporary KLTC in October 2001. Lite Fm, as it was called, was the first station in the Missoula market to broadcast continuous Christmas music during the holiday season. It became the second station in the market to broadcast the syndicated Delilah show until the end of the 2002 Christmas season. It then became an adult top 40 station as Wild 1075. In 2004, the format was moved to more of a contemporary hit radio format and by September it had started an urban format from 7 pm to midnight. For a few days it became a fully fledged hip-hop station before moving back to hot adult contemporary.
On the weekend of 4 July in 2005, it changed to triple A as Rock 107.5. However, unlike most adult alternative stations, it did play heavy songs such as "More Human than Human" and "Crazy Train", and harder selections by Metallica, Nirvana and Pearl Jam mixed in with more standard triple A bands such as Coldplay, U2 & INXS to take on clustermate 963 The Blaze & newly launched trail 1033. Eventually, the station changed to mainstream rock. It also became the first station to air the syndicated Bob & Tom show.
KLTC remained a rock station until January 2007, when it changed to a rhythmic adult contemporary format as "Energy 107.5", which changed to a rhythmic contemporary format in 2008, claiming to be "Your Only Station In The State For Hip-Hop & R&B". The switch also brought back the Kidd Kraddick morning show to Missoula. The station also started internet streaming and tried to market itself with an interactive approach. In 2009, the station changed to contemporary hit radio as "107.5 Zoo FM" but still kept most of the rhythmic titles it had as Energy and continues to lean rhythmic to try to compete with the more adult-leaning KXDR and Hot AC's KMSO and KKVU.