WMFG signed on the air on October 12, 1935, with studios in the Androy Hotel in downtown Hibbing, Minnesota. The station became affiliated with CBS in September 1937. As a CBS affiliate it carried the famous October 30, 1938, War of the Worlds broadcast. In June 1942, WMFG dropped CBS and joined the NBC Red. It remained with NBC until the early 1960s. By 1962, it was an independent station. WMFG was one of the original affiliates of the Minnesota Twins Radio Network in 1961. The station joined ABC in 1968 and remained with ABC until the mid-1980s. The station was sold in 1983 and FCC rules in effect at the time required the call letters be changed. The station was assigned the call sign WGGR on November 1, 1983. On August 5, 1987, the station changed its call sign back to the original WMFG.