The NASA 25 Hours at Ozarks International Raceway is a premier endurance racing event, recognized as the longest endurance race in the country. Formerly known as the iconic 25 Hours of Thunderhill, this challenging competition tests the limits of both drivers and machines over a grueling 25-hour period. Held at the state-of-the-art Ozarks International Raceway in Gravois Mills, Missouri, this event is a highlight for motorsports enthusiasts and professional racing teams alike.
What to Expect
A grueling and exciting 25-hour endurance race.
Who Should Attend
Motorsports fans
Racing teams
Endurance racing enthusiasts
Agenda Overview
The race takes place over 25 hours.
Venue & Address
Ozarks International Raceway
29211 MO-135 Gravois Mills , Missouri – 65037 United States
Organizer
NASA (National Auto Sport Association) · Motorsports Organization
A national organization for auto sports and racing.
Frequently Asked Questions
When is the event?
June 25, 2026.
Where is it held?
Ozarks International Raceway, 29211 MO-135, Gravois Mills, MO.
What is the event?
A 25-hour endurance race.
Why is it famous?
It is the longest endurance race in the country.
Is it open to the public?
Yes, spectators are welcome.
What is the track?
Ozarks International Raceway.
Tags
Racing
Endurance
Motorsports
Gravois Mills
Missouri
NASA
Summary
A prestigious 25-hour endurance race held at a professional raceway.