"The Zone" became Billings' first modern rock or alternative radio station. The format of music it plays has sometimes been referred to as new rock as well. Its playlist tends to be a mix of alternative acts, active rock, as well as 1980's classic rock. It began broadcasting as "The Zone" in June 2000. It had formerly played a country music format.
In June 2006, KRZN was acquired by Cherry Creek Radio from Fisher Radio Regional Group as part of a 24 station deal with a total reported sale price of $33.3 million. It was later acquired by Connoisseur Media.