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Bighorn Trail Run
Race Details:
- Location: Dayton, WY, United States
- Race Date: 06/19/2027
- Race Distances: 100 Mile, Ultra Marathon
What This Race Counts Toward:
Western States 100: Yes
UTMB Index: No
Bighorn Trail Run Description
The Bighorn Trail Run sends 100-mile runners on a remote out-and-back through the Bighorn National Forest near Dayton, Wyoming each June, climbing over 20,000 feet through the Little Bighorn and Tongue River drainages. Born out of a local effort to protect the Bighorn Mountains from development, the race has earned a reputation as one of the toughest ultras in the country, with steep climbs, technical descents, and true backcountry remoteness. It’s a Western States 100 qualifier that rewards runners who come ready for a genuine mountain test.
Always check the official race website for the most accurate and up-to-date race information and logistics.
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Bighorn Trail Run Additional Details:
The course mixes technical single-track, rugged jeep doubletrack, and gravel road across its full 100 miles, with stretches of up to 18 miles between access points where the trail is the only way in or out. Runners share the course with elk, deer, moose, and the occasional black bear, and should plan for extreme, fast-changing mountain weather at elevation. Aid stations are run entirely by volunteers who camp on the course for days before the race, stocking major checkpoints with hot food alongside standard ultra fare. With a 35-hour cutoff, the Bighorn 100 is a full test of pacing, preparation, and grit from the Little Bighorn drainage to the finish in Dayton.
Course Information
Profile: Very Hilly
Type: Out and Back
Surface: Mixed Surfaces
Pace Groups: No
Time Limit: 35 hours
# of Finishers
100 Mile: 79% out of 200 to 300 entrants
Elevation Details
Elevation Gain: 20,500 ft
Elevation Loss: 20,750 ft
Average Temperature
- Low: 48°F
- High: 77°F
Train Smarter for Race Day
A great race starts long before the starting line. Whether you’re chasing your first finish or hunting a new PR, a structured training plan takes the guesswork out of race prep — building your fitness, your confidence, and your mileage at the right pace for you.
Explore plans for every distance and experience level, from your first 5K to your next ultra.
Plans for every ultra distance, from your first one to your longest day yet.
Things to Do in Dayton, WY, United States
Make the most of race weekend — here’s how to fill the time before and after you cross the finish line.
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Hotels & Lodging Near the Bighorn Trail Run
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