The first round of the postseason tournament featured a best-of-three games format. The team that finished ninth in the conference was not eligible for tournament play. Teams were seeded No. 1 through No. 8 according to their final conference standing, with a tiebreaker system used to seed teams with an identical number of points accumulated. The top four seeded teams each earned home ice and hosted one of the lower seeded teams.
The winners of the first round series advanced to the semifinal and championship rounds held at the Civic Center. All Final Four games used a single-elimination format. Teams were re-seeded No. 1 through No. 4 according to the final regular season conference standings, with the top remaining seed matched against lowest remaining seed in one semifinal game while the two other semifinalists meeting with the winners advancing to the championship game and the losers competing in a Third Place contest. The Tournament Champion received an automatic bid to the 1991 NCAA Division I Men's Ice Hockey Tournament.
Conference standings
Note: GP = Games played; W = Wins; L = Losses; T = Ties; PTS = Points; GF = Goals For; GA = Goals Against
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