Course
A looped course of double-track and single-track trail through Mueller State Park near Divide, Colorado, with zero pavement. Start and finish are at the Pisgah Camping Area, where the single aid station sits and which runners pass between laps. The terrain is scenic and challenging.
Key dates
- !Entries openTue 1 Dec 2026 · in 6 weeks
- ★Race daySat 15 May 2027
About
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. 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.
Save Endure Trail Runs to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Ram Party Trail Runs
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Boneyard Boogie 14K & 6K
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Vallecito Lake Heavy Half
A rugged half marathon beside Vallecito Lake
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.