Entries are stacking up for the 2019 NASA 25 Hours of Thunderhill Presented by Hawk Performance. Already, some 45 teams have stepped up to take on the longest closed-course endurance race in North America.

Slated for the weekend of Dec. 7-8, 2019, the 25 Hours of Thunderhill also will host the 12-hour final race of the Western Endurance Racing Challenge series during the first 12 hours of the race. Teams can supersize into the 25 from the 12 and vice versa.

The 25 is like no other endurance race in the country. The diverse mix of cars, amateur and semiprofessional teams, and the elements all combine to make it unique and challenging.

Register for the 25 Hours of Thunderhill

Register for the 12 Hours of Thunderhill

12 and 25 Hour Rules


  1. Where can we find a list of all the entries? Going to the registration link and then “Entry List” doesn’t provide any information.

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