Endure Trail Runs
Divide, United States • 15 May 2027
Endure Trail Runs at Mueller State Park
Endure Trail Runs take place at Mueller State Park, Pisgah Point Group Camping Area in Divide, Colorado. The event offers multiple trail race formats on courses that use only single-track and double-track trails with no pavement. An aid station is provided on course.
Distances and formats include:
- 10k - 6.81 miles (green then orange loops)
- Half Marathon - 14.12 miles (green, orange, then purple loops)
- Marathon - 26.53 miles (green, orange, purple including Grouse Mountain, blue, then red)
- 12 hour (Tiny Balls) - timed event with individual loop draws
- 12 hour (Endure LRS) - timed event with field loop draws and pace ball
The two 12 hour events use colored ball draws to determine which loop or sequence runners will complete. In the Tiny Balls event each runner draws their own loop sequence; black balls are included in that format. In the Endure LRS event the race director draws the loop for the entire field and a separate pace ball sets a maximum loop completion pace; failure to return in time can lead to elimination. Results in the timed events are based on total miles completed within the time limit.
The 10k, half marathon, and marathon routes share the loop system and a course cutoff applies to these distances. The event was formerly known as the Tommyknocker 12 Hour and Mine Shaft Half. Visit the organization's website for the most recent information.