2021 IMSA Prototype Challenge
The 2021 IMSA Prototype Challenge is the sixteenth season of the IMSA Lites series and its successors, and the fifth under the IMSA Prototype Challenge name. The season started on January 23 at Daytona International Speedway and concludes on November 12 at Michelin Raceway Road Atlanta. Calendar. The provisional 2021 calendar was released on September 9, 2020. As of April 7, 2021 the calendar remains provisional and subject to change. Race results. Bold indicates to overall winner. External links. Official Website IMSA Website