Endure Trail Runs
Sat, May 16, 2026, 4:00 AM MDT
- Type
- Run
Finish signup on the organizer site (check fees and dates there).
Race feel
A unique trail challenge at Mueller State Park, featuring a 12-hour timed event where colorful balls determine your loops, plus scenic traditional distances.
- Fun
- Scenic
- Quirky
Fun
Scenic
QuirkyExperience the Endure Trail Runs at Mueller State Park, offering a unique 12-hour timed event where colorful balls determine your next loop. For those seeking a more traditional distance, choose from a 10k, Half Marathon, or Marathon. All courses traverse beautiful double-track and single-track trails with no pavement, set in a supportive, no-pressure environment. Enjoy the natural beauty and a generous 11-hour cutoff, making it welcoming for various paces.
What to expect
- Engage in a distinctive 12-hour timed event where your next trail loop is determined by drawing colorful balls.
- Run traditional distances including a 10k, Half Marathon, or Marathon on beautiful, unpaved trails.
- Enjoy a supportive, no-pressure atmosphere with a generous 11-hour cutoff for all distances.
Standout details
- Unique ball-pulling loop system
- 12-hour timed event option
- Zero pavement trails
- Generous 11-hour cutoff
Distances & registration
5 optionsUse the official signup link above for all distances.
Marathon
1 option · closes May 12, 2026, 7:59 PM MDT
10d 12h 43m leftGeneral entry
Closes May 12, 2026, 7:59 PM MDT · From $107.00
Other options
2 options · closes May 12, 2026, 7:59 PM MDT
10d 12h 43m left12-Hour (Endure- LMS)
Closes May 12, 2026, 7:59 PM MDT · From $128.20
12-Hour (Tiny Balls)
Closes May 12, 2026, 7:59 PM MDT · From $128.20
6.81 Miles
1 option · closes May 12, 2026, 7:59 PM MDT
10d 12h 43m left10k
Closes May 12, 2026, 7:59 PM MDT · From $64.60
14.12 Miles
1 option · closes May 12, 2026, 7:59 PM MDT
10d 12h 43m leftHalf Marathon
Closes May 12, 2026, 7:59 PM MDT · From $75.20
Summaries use public event text. Confirm schedule, fees, and rules on the official page before you sign up.
From the organizer
The Human Potential Running Series Presents: The Endure Trail Runs @ Mueller State Park
The Endure 12-Hour is a one-of-a-kind 12-Hour timed event designed by YOU… and tiny colorful balls. Each runner will pull colored balls from a bucket, which determines the loop they’ll next run. This continues for up to 12 hours; the runner’s result is the miles they ran within the allotted time. Y ou are not required to run for all 12 hours , as your final result is the number of miles you ran within the time you participate!
The 10k, Half Marathon, and Marathon are great ways to enjoy Mueller State Park’s natural beauty in a supportive, “no-pressure” environment. All three distances feature a generous 11-hour cutoff.
All courses feature double-track and single-track trails with ZERO pavement, and an aid station you’ll want to hang around at for hours (we’re that much fun)!
Formerly Known As The Tommyknocker 12-Hour & Mine Shaft Half