Bighorn Trail Run
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About the race
The Bighorn Trail Run is a multi-distance trail event in the Bighorn Mountains near Dayton, WY, held over two days. Entries are non-transferrable and refunds are not offered after March 31, 2026. Participants must register for a single distance and distance changes are not allowed. Regular registration opens for the 100M on October 15, 2025 and for the 18M, 32M, and 52M on January 5, 2026. The 18M field is listed as full with a wait list available.
Distances offered:
- 100 miles
- 52 miles
- 32 miles
- 18 miles
The 100-mile course is an out-and-back through Little Bighorn and Tongue River areas of the Bighorn National Forest with a 34-hour limit and an average pacing guideline noted as 2.94 mph. Course statistics include about 20,500 feet of ascent and 20,750 feet of descent, approximately 76 miles of technical single-track, 16 miles of 2-track jeep trail, and 8 miles of gravel road. The route passes remote backcountry sections where stretches of up to 18 miles provide the only access.
Trail marking includes orange flagging, wire ground flags in meadows, lime arrows at some junctions, reflective tape, and glow sticks for night sections. The event notes the presence of wildlife including elk, deer, moose, black bear, mountain lions, and rattlesnakes. Volunteers staff aid stations and provide first aid support; crew access points are limited so individual preparation and required equipment are emphasized. Visit the organization's website for the most recent information.