Imsa Calendar 2025. Imsa president john doonan revealed the slate of races that will make up the 2025 schedules for the weathertech championship and the imsa michelin pilot challenge. Imsa has (already) unveiled its 2025 calendar, practically unchanged compared to that of 2024.

Imsa has announced its calendar for the 2025 imsa weathertech sportscar championship during this weekend’s 12 hours of sebring. 13 events (2014, 2018, 2019, 2021, 2022) shortest season: