The spring and summer regular season records were combined to determine LCS Championship seeding.
The summer split regular season was expanded to a triple round-robin format that took place over nine weeks.
The quarterfinals in the knockout stage were contested in a best-of-three series, while the semifinals and final used a best-of-five format.
Additionally, they gained the advantage of side selection for Game 5 of the regular season in case of tied head-to-head records.
The top six teams from the Spring Split advanced to the Mid-Season Showdown (MSS), a double-elimination tournament.
This format was similar to the 2020 Spring Playoffs, with the fifth and sixth seeds starting in the lower bracket.
The Summer Split regular season featured a triple round robin format, spanning nine weeks of play, where each team faced each other three times.
The top eight teams with the highest combined regular season records from both spring and summer secured spots in the LCS Championship playoffs.
However, due to the increasing number of COVID-19 cases in the United States, these matches were relocated to the LCS Arena in Los Angeles, California, where they took place without a live audience.