The 2021 Monster Energy AMA Supercross schedule has been adjusted to include a third race in Indianapolis, Indiana. Lucas Oil Stadium will now host a trio of races as Rounds 4 and 5 will take place on Saturday, January 30 and Tuesday, February 2 as originally planned and Round 6 will now take place on Saturday, February 6.

The schedule will resume on Saturday, February 20 at State Farm Stadium in Glendale, Arizona as originally scheduled, followed by the Daytona Beach, Florida round on Saturday, March 6 and then the Arlington, Texas rounds will now be Saturday, March 13, Tuesday, March 16 and Saturday, March 20 at AT&T Stadium. The season finale will take place at Rice-Eccles Stadium in Salt Lake City.     

Three Rounds of the 17-Round Championship will be announced later as will the remaining Eastern Regional and Western Regional 250SX Class races, Triple Crown and East/West 250SX Showdown events.