IMSA has revealed the 11 dates for the 2027 WeatherTech SportsCar Championship, a season that retains the same venues and race formats as this year but will carry the weight of four significant anniversaries, including the 75th running of the 12 Hours of Sebring, the 65th running of the 24 Hours of Daytona, 70 years of competition at Laguna Seca, and the 30th running of the Petit Le Mans at Road Atlanta.

Photo By IMSA

A calendar that barely moved

Those who place the 2026 and 2027 calendars side by side will find few differences. Daytona shifts from January 21st to the 28th, the Petit Le Mans moves from September 30th to October 6th, and Detroit shifts from May 29th to June 4th, slightly extending the gap between the California swing and the start of summer on the East Coast. Race formats remain intact at all venues, with Road America at six hours, Indianapolis at 2 hours 40 minutes, Long Beach and Detroit at 100 minutes. The category distribution per event also remains identical, with all four classes (GTP, LMP2, GTD PRO, and GTD) together at the five endurance rounds of the Michelin Endurance Cup plus Indianapolis.

That stability confirms that IMSA has found a calendar formula that works and has no reason to change it. The 11 venues have been fixed for several years now, the alternation of categories between permanent and street circuits is resolved, and the season's arc (Florida in winter, California in spring, Northeast and Midwest circuits in summer, fall finale in Georgia) needs no adjustments.

Photo By IMSA

Additional tests at endurance circuits

IMSA plans to add official test sessions at Daytona, Sebring, Watkins Glen, Road America, and Road Atlanta ahead of the long races, reserved exclusively for teams entered in the WeatherTech Championship. No dates are defined yet, but the intention is to give competitors regulated track time at the circuits where they need it most, rather than relying on private tests. The pre-season will kick off with the Roar Before the Rolex 24 from January 22nd to 24th, mandatory as every year for all teams that will compete at Daytona.

2027 IMSA WeatherTech SportsCar Championship Schedule

Dates	Circuit	Format	Classes
Jan 22-24	Daytona International Speedway	Roar Before the 24 (testing)	GTP, LMP2, GTD PRO, GTD
Jan 28-31	Daytona International Speedway	24 hours	GTP, LMP2, GTD PRO, GTD
Mar 17-20	Sebring International Raceway	12 hours	GTP, LMP2, GTD PRO, GTD
Apr 16-17	Long Beach	100 minutes	GTP, GTD
Apr 30-May 2	WeatherTech Raceway Laguna Seca	2h 40m	GTP, GTD PRO, GTD
Jun 4-5	Detroit	100 minutes	GTP, GTD PRO
Jun 24-27	Watkins Glen International	6 hours	GTP, LMP2, GTD PRO, GTD
Jul 9-11	Canadian Tire Motorsport Park	2h 40m	LMP2, GTD PRO, GTD
Jul 29-Aug 1	Road America	6 hours	GTP, LMP2, GTD PRO, GTD
Aug 20-22	VIRginia International Raceway	2h 40m	GTD PRO, GTD
Sep 17-19	Indianapolis Motor Speedway	2h 40m	GTP, LMP2, GTD PRO, GTD
Oct 6-9	Michelin Raceway Road Atlanta	10 hours	GTP, LMP2, GTD PRO, GTD