[2] They have played their home games at Legends Field (formerly CommunityAmerica Ballpark) since 2003, when the team began as a member of the Northern League.

The team was founded in 1993 as the Duluth–Superior Dukes (representing Duluth, Minnesota, and Superior, Wisconsin), a charter member of the Northern League.

The T-Bones broke ground on the park now known as Legends Field on September 4, 2002, and played their first home game on June 6, 2003, just over nine months later.

Eight T-Bones were selected to the East Division squad, which won the game 7–6, scoring two runs in the bottom of the ninth.

[5] The highlight of the night, though, was the appearance of 94-year-old Buck O'Neil, a former Kansas City Monarchs star who took one at-bat for each side, drawing walks each time.

They swept the Fargo-Moorhead RedHawks in the best-of-five semifinal round of the playoffs and then defeated the Gary SouthShore RailCats three games to one to win the Northern League championship.

The T-Bones matched their previous season's record (46–50) and finish (fourth in a six-team league) in 2009, but could not advance past the first round, losing that series 3–2 to Gary.

The T-Bones enjoyed their most successful season under new manager Tim Doherty, winning 58 games and setting a new league record with 162 home runs, exceeding the previous high by more than 30%.

On October 13, 2010, the T-Bones left the Northern League, along with the Fargo-Moorhead RedHawks, Gary SouthShore RailCats, and the Winnipeg Goldeyes to join the American Association (AA) for the 2011 season.

In 2014, Kansas City's record improved to 48–52 under first-year manager John Massarelli, finishing third in the Central Division.

Pitcher Tommy Collier led the league with 12 wins and 140 strikeouts, while Todd Cunningham was named an American Association Postseason All-Star.

The T-Bones partnered with the Unified Government and the Kansas City Royals, the Major League Baseball franchise across the river in neighboring Kansas City, Missouri, to host a group of Royals players and coaches at T-Bones Stadium as the club's "alternate training site" for summer training.

[12] Kansas City won the 2021 American Association championship, going a perfect 6-0 in the postseason and sweeping the Fargo-Moorhead RedHawks in the best-of-five Finals.

The season was highlighted by posting a league-best and franchise-record 69 wins, as well as setting AA records with 149 homers and 664 runs scored.

Nonetheless, the Monarchs earned a third straight division title with a league-best 65-35 record to take the West crown, only to succumb in the semifinals to eventual champion Fargo-Moorhead.

Starting pitcher Matt Hall earned AA Starting Pitcher of the Year honors after posting a league-record 1.10 ERA while the club shattered their own year-old league records by scoring 696 runs and blasting 165 home runs, while also setting league records in slugging percentage (.505), walks (478), grand slams (8), and total bases (1,767).

Catcher Chris Herrmann earned Postseason All-Star honors and was named American Association Player of the Year after slashing .355/.439/.617 with 23 home runs and a league-high 88 RBI.