Event Overview

The Texoma Challenge is an endurance event featuring a 5K, 10K, 10K Ruck, Half Marathon, Marathon, 50K, and 50K Relay in the foothills of North Texas at Waterloo Park. The event follows 6.2 mile loop of unique trails beginning and ending in Waterloo Park in Denison Texas.

Price Increases
Early Bird (January 21st through March 2nd)
Standard (March 3rd through May 22nd)
Late Registration (May 23rd, if not sold out)

Texas Summer Night Series

This race is a part of the Texas Summer Night Series. You can save up to 20% on the 2026 Texas Summer Night Series by registering for a Series Pass. You can choose your distance range or get the Midnight Monster Pass, which allows you to build up to the 40 Miler Race at the Noche Trail Run in September.

Series Passes are available until June 3, 2026, lock in yours before! Sign Up for the Series Here
The first 50 people who register for any of the Texas Summer Night Series Passes will receive a FREE TSNS hat shipped to them. Anyone who finishes 3/7 races will receive a TSNS exclusive duffle bag. Complete 6/7 races, and runners get a Texas Summer Night Series plaque and the collectible race medals.

June 6 | Texoma Challenge (Denison TX) Sign Up

June 13 | Fire Trail Running Festival (near San Antonio TX) Sign Up

August 1 | Fiesta Night Run (San Antonio TX) Sign Up

August 15 | Night Claw (Glen Rose TX) Sign Up

September 5 | Bear Country Night Trek (Waco TX) Sign Up

September 12 | Lone Star Night Run (near Ft Worth TX) Sign Up

September 19 | Noche Trail Run (near Kerrville TX) Sign Up

Course Overview

- Surface: Rooty & dirt single-track trails.
- Course: Waterloo Trails Course Map
- Elevation: Rolling hills 500 ft elevation gain per loop.
- Location: Waterlooo Park (1101 Waterloo Lake Dr, Denison, TX 75020)
- Weather: Historic Average shows 68-80 degrees
- No Cup Race: We don't serve cups, please make sure to bring your own water-carrying system!

Location and Times

Waterloo Park - 1101 Waterloo Lake Dr, Denison, TX 75020

Schedule - Saturday
*Please arrive 60-45 min. before your start time*
6PM - packet pickup + Texas Outlaw pop-up store
8PM - 50K & Marathon STARTS
8:10PM - Half Marathon, 10K, & 10K RUCK STARTS
8:20PM - 5K STARTS
8:30PM - 5OK Relay STARTS
*headlamp required for ALL particpants*

Sunday
5AM - cutoff for all events (9 hours)

Ruck Weight requirements
- If you weigh more than 150 lbs = 30 lb. Ruck
- If you weigh less than 150 lbs = 20 lb. Ruck
Ruck Sack or Vest are allowed

What You Get

ALL DISTANCES
- Texoma Challenge Tee
- 1st, 2nd, 3rd place OVERALL male AWARDS FOR EACH DISTANCE
- 1st, 2nd, 3rd place OVERALL Female AWARDS FOR EACH DISTANCE

RUNNING EVENTS
- Each running event will get a Texoma Challenge finisher medal with their distance on it.
- There will be a last place, DFL "Dead Freakin' Last" award for the 50K running event & relay
- Relay teams will get a 1st place championship team award & 2nd place runner-up award

RUCK EVENT
- All Ruck finishers will earn a Texoma Challenge RUCK patch

More Information/Policies/FAQ

For more detailed information, including the course map, other event info, and aid stations, please visit www.TexasOutlawRunning.com

For Policies regarding event communication, refunds/credits, discounts, ensuring race shirts/swag, lower entry prices, and changing distance, visit our Policies Page

For other questions, please make sure to look at our Frequently Asked Questions page before contacting us. If the answer is on that page, we may not respond. You can contact us by visiting our website. 

Event's current local time: 3:10 PM CT