NOTES:
- No league play in 1958-59.
- No tournament played until 1960.
- The 2020 tournament was canceled after the quarterfinals because of the COVID-19 pandemic, resulting in no tournament champion for the 2019-20 season.
| SEASON | REGULAR SEASON CHAMPION(S) | TOURNAMENT CHAMPION |
|---|---|---|
| 1951-52 | Colorado College | |
| 1952-53 | Minnesota & Michigan | |
| 1953-54 | Minnesota | |
| 1954-55 | Colorado College | |
| 1955-56 | Michigan | |
| 1956-57 | Colorado College | |
| 1957-58 | North Dakota & Denver | |
| 1959-60 | Denver | Denver & Michigan Tech |
| 1960-61 | Denver | Denver & Minnesota |
| 1961-62 | Michigan Tech | Michigan Tech |
| 1962-63 | Denver & North Dakota | Denver |
| 1963-64 | Michigan | Denver |
| 1964-65 | North Dakota | Michigan Tech |
| 1965-66 | Michigan Tech | Denver & Michigan State |
| 1966-67 | North Dakota | Michigan State & North Dakota |
| 1967-68 | Denver | Denver & North Dakota |
| 1968-69 | Michigan Tech | Denver & Michigan Tech |
| 1969-70 | Minnesota | Michigan Tech & Wisconsin |
| 1970-71 | Michigan Tech | Denver & Minnesota |
| 1971-72 | Denver | Denver & Wisconsin |
| 1972-73 | Denver | Denver & Wisconsin |
| 1973-74 | Michigan Tech | Michigan Tech & Minnesota |
| 1974-75 | Minnesota | Michigan Tech & Minnesota |
| 1975-76 | Michigan Tech | Michigan Tech & Minnesota |
| 1976-77 | Wisconsin | Wisconsin |
| 1977-78 | Denver | Colorado College & Wisconsin |
| 1978-79 | North Dakota | Minnesota & North Dakota |
| 1979-80 | North Dakota | Minnesota & North Dakota |
| 1980-81 | Minnesota | Michigan Tech & Minnesota |
| 1981-82 | North Dakota | Wisconsin |
| 1982-83 | Minnesota | Wisconsin |
| 1983-84 | Minnesota-Duluth | Minnesota-Duluth |
| 1984-85 | Minnesota-Duluth | Minnesota-Duluth |
| 1985-86 | Denver | Denver |
| 1986-87 | North Dakota | North Dakota |
| 1987-88 | Minnesota | Wisconsin |
| 1988-89 | Minnesota | Northern Michigan |
| 1989-90 | Wisconsin | Wisconsin |
| 1990-91 | Northern Michigan | Northern Michigan |
| 1991-92 | Minnesota | Northern Michigan |
| 1992-93 | Minnesota-Duluth | Minnesota |
| 1993-94 | Colorado College | Minnesota |
| 1994-95 | Colorado College | Wisconsin |
| 1995-96 | Colorado College | Minnesota |
| 1996-97 | Minnesota & North Dakota | North Dakota |
| 1997-98 | North Dakota | Wisconsin |
| 1998-99 | North Dakota | Denver |
| 1999-00 | Wisconsin | North Dakota |
| 2000-01 | North Dakota | St. Cloud State |
| 2001-02 | Denver | Denver |
| 2002-03 | Colorado College | Minnesota |
| 2003-04 | North Dakota | Minnesota |
| 2004-05 | Colorado College & Denver | Denver |
| 2005-06 | Minnesota | North Dakota |
| 2006-07 | Minnesota | Minnesota |
| 2007-08 | Colorado College | Denver |
| 2008-09 | North Dakota | Minnesota-Duluth |
| 2009-10 | Denver | North Dakota |
| 2010-11 | North Dakota | North Dakota |
| 2011-12 | Minnesota | North Dakota |
| 2012-13 | Minnesota & St. Cloud State | Wisconsin |
| 2013-14 | Ferris State | Minnesota State |
| 2014-15 | Minnesota State | Minnesota State |
| 2015-16 | Michigan Tech & Minnesota State | Ferris State |
| 2016-17 | Bemidji State | Michigan Tech |
| 2017-18 | Minnesota State | Michigan Tech |
| 2018-19 | Minnesota State | Minnesota State |
| 2019-20 | Minnesota State | |
| 2020-21 | Minnesota State | Lake Superior |