Full NASA MidAmerica Event dedicated to ENDURANCE Racing. Easy entry. Develop/Practice your drivers at this event for the 25 or just enjoy a great and easy endurance weekend with your team. This event also has a Friday Day to Night Track Day open to all intermediate+ drivers.

Test+11 straight hours of Endurance Racing.

Saturday, March, 28th. TREC is open to ALL Intermediate or better drivers. Find a team and run this race!

DAY to NIGHT OPEN TRACK/TEST AT OIR!!

Friday, March 27th.

OPEN TO ALL HPDE 3+, Intermediate drivers or better.

7 to 11 pm.

Don't miss this rare opportunity to run OIR at night!!

Bring your team, form a team or join a team! Lots of ways to run this event!

Don't miss out on the fun!

**Don't forget your garage! See "EVENT PARKING" at the top right of this page. You can now choose your own garage at time of purchase.

This race will run under our NASA TREC Rules.

The easiest way to endurance race in the country!

2026 TREC Rules

Use our track records for OIR for your cars placement in TREC

Ozarks International Raceway - NASA MidAmerica Track Records - Google Sheets

Check out the rules for the NASA 25 Hour of Ozarks Race here:

Ozarks International Raceway - June 25th - 28th, 2026 - #5335 | #DRIVENASA

Join us for this 11 hour race and prep your team for the Longest, Oldest, most challenging Endurance Race in the Country!