It was held between March 17 and 19, 1966, and concluded with Michigan State defeating Clarkson 6–1.
All games were played at the Williams Arena in Minneapolis, Minnesota.
An at-large bid was offered to a second eastern team based upon both their ECAC tournament finish as well as their regular season record.
[1] Despite winning the tournament the ECAC champion was not seeded as the top eastern team; this occurred because the at-large team played and won more games, both in conference and overall.
The WCHA co-champion with the better regular season record was given the top western seed.