2026 St. Louis Supercross – 450SX Heat 1 | Round 12

The 450SX class opens its night at Round 12 of the 2026 Monster Energy AMA Supercross Championship — and Heat 1 at The Dome at America’s Center in St. Louis, Missouri marks the beginning of another crucial evening for the premier class title fight.

St. Louis is one of the most electric stops on the Supercross calendar. The Dome at America’s Center creates an indoor atmosphere that is hard to match anywhere else in the series, and the track layout consistently delivers close, technical racing that keeps the crowd on their feet from the very first lap. For the 450SX riders, arriving at a venue like this with the championship on the line adds another layer of pressure to every single race of the night.

Heat 1 is where the tone is set. A strong result means a prime gate pick heading into the main event — and at a track as tight and technical as St. Louis, starting position can be absolutely decisive. The 450SX riders who perform cleanly and confidently in Heat 1 carry that momentum straight into the most important race of the night.

With the 2026 450SX championship entering its final stretch, every round from here on out carries enormous weight. St. Louis has a history of delivering results that shake up the standings — and it all starts with Heat 1.

Hit play on the video below and watch 450SX Heat 1 from the 2026 St. Louis Supercross.

450 Heat Race 1