The Minot Mallards of the Manitoba–Dakota League ended the 1956 regular season with a record of 43–35, placing 3rd in the league standings. Knowles Piercey and Hal Daugherty served as managers in 1956. In the Playoffs, the Mallards defeated the Bismarck Barons 4 games to 2. In the Finals, the Williston Oilers defeated Minot 4 games to 2. 1957 was the final season of the Manitoba–Dakota League and Minot advanced to the league Finals. With Clifton McLean returning as manager, the Mallards ended the 1957 season with a 36–35 record, placing 2nd in the regular season standings. In the Finals, the Bismarck Barons defeated the Minot Mallards 2 games to 1, when Minot forfeited after rain cancelled two games. The Manitoba–Dakota League permanently folded after the 1957 season. Northern League 1958–1960, 1962 Minot looked to host a franchise to join the Northern League in 1958, in unison with the Bismarck-Mandan Pards. The Northern League was looking to expand to ten teams and wished to add both franchises. But, the eight–team Northern League saw their Wausau franchise fold, leaving them with seven teams. The Northern League wasn't able to successfully create a nine–team schedule after Wausau folded. The league was only able to add one more team and Minot was chosen over a Bismarck-Mandan franchise to be the eighth team. After the folding of the Manitoba-Dakota League, the Minot Mallards continued play, becoming members of the 1958 Class C level Northern League as an affiliate of the Cleveland Indians. The Minot Mallards ended the 1958 Northern League regular season with a record of 67–55, placing 4th in the standings. In the playoffs, the Fargo-Moorhead Twins defeated Minot in a one–game playoff. Ken Landenberger was the 1958 manager. Playing home games at Corbett Field, season attendance was 34,355, an average of 563 per game. The 1959 Minot Mallards continued play as a Cleveland Indians affiliate, playing again under manager Ken Landenberger. Minot finished the 1959 regular season with a record of 63–60, 4th in the Northern League. In the Playoffs, the Aberdeen Pheasants defeated Minot. Season Attendance at Corbett Field was 29,337. In the 1960 season, the Mallards placed 4th in the Northern League regular season standings, ending the season with a 62–62 record. Walt Novick was the 1960 manager. In the playoffs, the Duluth-Superior Dukes defeated the Minot Mallards. Corbett Field season attendance was 25,376, an average of 409 per game.