NASA 25 Hours at Ozarks International Raceway

Welcome to NASA 25 Hours at Ozarks International Raceway

The Longest Endurance Race in the Country. Formerly the Iconic 25 Hours of Thunderhill.

Event Details

• Event: NASA 25 Hours of Ozarks
• Location: Ozarks International Raceway, Gravois Mills, MO
• Date: June 25-28
• Classes: Multi-Class. 6 classes
• HYC — (Hypercar)
• Fastest class, no limits on modifications. NASA Super Unlimited rules apply.
• PLE — (Prototype Lite Endurance)
• Same rules as HYC. Vehicles are restricted to having less than 2.5 liters displacement naturally aspirated, or 1.3 liters with forced induction.
• GTE — (Grand Touring Endurance) – Grand Touring Cars, Production Cars and Tin Tops
• Follows: NASA Super Touring GT rules. Unlimited modifications for GT style cars.
• STE — (Super Touring Endurance)
• Follows: NASA Super Touring 2 rules.
• TC1 — (Touring Car 1)
• Follows: NASA Super Touring 4 rules.
• TC2 — Touring Car 2)
• Follows: NASA Super Touring 5 rules.
• Entry Cap: 62 Teams

NASA 25 Hour Endurance Racing Rules/Regulations

What’s New?

• New venue with dynamic natural terrain.
• No minimum laps times – any car meeting NASA CCR’s is eligible.
• Fresh challenges and strategy with the unique Ozarks circuit.
• Sector Timing. You’ll know where your team is fastest and slowest. Compared with all other teams.
• Yellow Flag Pit Stops
• Single Class Qualifying, Best Time
• Day and Night Practice – Thursday, June 25
• Test and Tune – Friday, AM June 26
• My Laps in car virtual flags join the best corner flaggers in racing. GPS satellite location monitoring shows exactly where you are every second.
• Livestream for the full 25 Hour, roving announcers, guest speakers. Your team and sponsors highlighted.
• WhatsApp team communication from tower to team.
• Team/Sponsor suites available

Register Your Team Now

• Interested teams can enter beginning Dec 3rd by paying a $250 reservation fee that will be applied to the final entry cost to secure a team’s spot. This fee is nonrefundable.
• The balance of the entry fees will be due at a date that will be announced early in 2026
• The NASA registration team will work with Team Principals to effortlessly register their vehicles and drivers. Teams eligible for the discounted “Multi-Car Team Entry” option will be selected from teams that have completed the reservation fee. Once you have registered using the “reservation fee” option, you will be contacted with additional information to move forward with either a single car entry or a discounted mulit-car entry.
• The entry fee for a single-car team will be $3,500.
• The entry fee for a three car team will be $5,000.

Cancellation Policy:

A Competitor may withdraw from the event and receive a refund minus a $250 administrative fee by giving written notice of cancellation via email, no later than June 3rd, 2026. Send cancellation notification to 25hr@drivenasa.com. 100% refund will be issued if the event is cancelled for any reason (inclement weather) by the organizer.

Questions?

Contact Donna or Randy Lane

25hr@drivenasa.com

❤️🤍💙

Team NASA MidAmerica, alongside Randy and Donna Lane, would like to extend our sincere gratitude to the entire NASA Leadership and Thunderhill Raceway for your support and belief in this monumental transition of the beloved 25-hour race. Your faith in this move means the world to us, and we are honored to carry this legacy forward.