WOI-FM first hit the airwaves on December 1, 1949. Like most FM stations of the time, it was originally a full-time simulcast of WOI (AM). The two stations went their separate ways in the 1960s.
Until the formation of Iowa Public Radio in 2004, WOI-FM was the flagship station for a mini-network of FM stations in central Iowa, including KWOI in Carroll and KTPR in Fort Dodge.
Shortly after midnight on September 10, 2012, the decades old classical music and news format of WOI-FM was changed by IPR to their News and Studio One service. The classical service moved to WOI-FM's second digital subcarrier. For those without HD Radio, the classical continues to be heard in portions of central Iowa on other frequencies.