About WDIOWDIO-TV first went on the air on January 24, 1966 and has transmitted from its first day in color. It immediately joined ABC, which had previously been relegated to off-hours clearances on CBS affiliate KDAL-TV (channel 3, now KDLH) and NBC affiliate WDSM-TV (channel 6, now KBJR-TV). It was owned by Frank Befera, a trained engineer who owned a chain of radio stations across northeastern Minnesota. WIRT went on the air on August 31, 1967. Befera sold channels 10 and 13 to publishers Harcourt Brace Jovanovich in 1977, but remained as president and general manager. HBJ sold the stations to Hubbard Broadcasting in 1986, and Befera retired a year later.
The station utilized a longtime logo from the 1980s until 2019, when it switched to a callsign-only logo. The lettering used in the logo (which blends a number "10" into the "IO" lettering) dates back to as late as the early 1970s. Changes to the 10/13 logo until 2019 merely depended on changes to ABC's logo and branding guidelines.
On April 11, 2008, a blizzard swept through the Northland. This caused power outages in Duluth causing WDIO, KDLH, and KBJR all to lose their signal at times.
On November 28, 2011, MeTV replaced RTV on 10.2 and 13.2. At the end of September 2017, WDIO/WIRT added Ion Television programming to their third subchannels, and all three signals now run in 720p high definition.