It was played between March 18 and March 20, 2021.As the tournament champion, St. Lawrence, received an automatic bid to the 2021 NCAA Division I Men's Ice Hockey Tournament.
With the majority of ECAC member schools opting out of competition for the 2020–21 season due to the COVID-19 pandemic, the format for the tournament was reduced to just four participating institutions.
The format introduced would have the four programs compete in two single-elimination rounds over the course of one championship weekend.
[1] On March 10, ECAC announced that Clarkson would not be participating in the tournament, due to COVID protocols.
Top-seed Quinnipiac was awarded a bye to the Championship game and St. Lawrence will host Colgate in the lone semifinal.