Imsa 2025 Schedule April 2025. Imsa has announced its calendar for the 2025 imsa weathertech sportscar championship during this weekend’s 12 hours of sebring. The season will consist of 11 rounds, including five races which form.

2025 imsa weathertech sportscar championship. The season will have 11 race weekends, 10 in the united states and one at canadian tire motorsport park in ontario.