Everything You Wanted to Know About The NASA 25 Hour
The NASA 25 Hours of Thunderhill is the longest closed-course endurance race in North America. Begun in 1998 as the Timex 12 Hours of Thunderhill, the race expanded to 25 hours in 2003, and has since evolved to become known as one of the most grueling endurance races in the nation, attracting amateur and professional sports car drivers from around the world.
Ozarks International Raceway in Gravois Mills, Mo., will be the site of the event, which will take place June 25-28, 2026.
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Questions and Answers to Feed Your Curiosity
The 25 Hours of Thunderhill was held at Thunderhill Raceway Park in Willows, Calif., from 1998 through 2023. Beginning in 2026, the race will take place at Ozarks International Raceway.
If there are no weather delays, the race begins at 11 a.m. Saturday and ends at noon Sunday
No. A minimum of two drivers are required.
Most teams have settled on a range of three to six drivers to run the event, but the number of drivers is not capped.
Yes, but we recommend rookies drive during daylight hours, so if you want to run the whole race, you should have drivers with regular competition licenses to handle night duties.
Yes. The NASA 25 Hour requires a team effort, and that means a full crew, professional or volunteer. You’re going to need people to do everything from fueling, servicing and repairing the car to forming race strategy and keeping everyone rested and fed.
Classes for the NASA 25 Hours of Ozarks have been retooled, which should make it easier to understand what the classes actually mean. Also, in the interest of decreasing speed differentials among classes while enhancing parity, we have reduced the number of classes from eight to five.
You can find information on the new classes for the NASA 25 Hour here.
Go to the registration page and get signed up when registration opens December 3.
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