The 2026 IMSA SportsCar Championship runs eleven rounds, opening with the signature back-to-back classics — the Rolex 24 At Daytona in January and the 12 Hours of Sebring in March — and closing with Petit Le Mans in October.
The headline schedule change is to the Michelin Endurance Cup. Road America joins the crown-jewel lineup with a new six-hour race, taking the slot previously held by Indianapolis; Indy stays on the calendar but reverts to a shorter sprint that no longer counts toward the Endurance Cup. The five enduros are now Daytona, Sebring, the Six Hours of The Glen, Road America and Petit Le Mans.
At the front, the GTP class fields five manufacturers — Porsche, Cadillac, BMW, Acura and Aston Martin. Most run hybrid LMDh machinery; Aston Martin's Valkyrie is the outlier, built to non-hybrid Le Mans Hypercar rules. There is change on the horizon, too: Acura has announced it will leave GTP at the end of the season.
New to the series? Start with what IMSA is.