KDAL signed on the air as a 100-watt station at 1500 kHz on November 22, 1936. The KDAL call sign came from the station's founder, Dalton A. LeMasurier, who was president and general manager of KDAL for many years. On September 5, 1937, power increased to 250 watts and the station joined the CBS Radio Network. KDAL broadcast CBS's dramas, comedies, news, sports, soap operas, game shows and big band broadcasts during the "Golden Age of Radio". With the enactment of the North American Regional Broadcasting Agreement (NARBA), the station moved to 1490 kHz in early 1941.[3]
KDAL switched frequencies to the current 610 kHz on October 24, 1941, increasing power to 1,000 watts. The switchover was dramatically made from a plane flying over the city. In 1947, a new transmitter and tower were constructed at 63rd Avenue West along the harborfront. The facilities remain to this day. KDAL got another power increase again to 5,000 watts on August 7, 1947.[4] A new transmitter and tower were constructed for the boost in wattage. This enabled KDAL to serve a wider area. The event was celebrated with a "Kilowatt Karnival" in the Duluth Armory.
In the 1948-1949 season, CBS raided NBC and grabbed some of their biggest stars. Radio's highest rated program, "The Jack Benny Program", moved to CBS and KDAL in January, 1949. "Amos 'n' Andy", "George Burns & Gracie Allen", "Edgar Bergen & Charlie McCarthy" and Bing Crosby also made the switch. CBS was suddenly the number one network and KDAL finally made some headway against NBC's WEBC.
KDAL made the jump to television as KDAL-TV (now KDLH) in 1953. FM station KDAL-FM went on the air in 1985.
Network programming moved from radio to television in the 1950s. KDAL featured a full service, middle of the road (MOR) format of popular music, news and sports in the 1950s, 1960s and 1970s. In the 1980s and 1990s, the music was updated to adult contemporary. By the late 1990s, the music shows were eliminated and the station became a full time talk outlet.
In the beginning of the 2000s, Midwest acquired KDAL AM/FM, KRBR-FM, WDSM, KTCO and KXTP in the Duluth/Superior market. KDAL would gain an additional sister station in the form of KQDS-FM in 2016, acquired by Midwest from Red Rock Radio.
In 2022, Midwest Communications merged the news-talk programming of sister station WDSM into KDAL.[5] Simultaneously, WDUL's sports-talk format was moved to WDSM. AM 710 is now branded as The Game with most programming originating from WRNW in Milwaukee. The 98.1 translator from WDSM moved to WDUL, which now airs a contemporary hit radio format as Hot 98.1.[6]