Bighorn 100
100 miles through Wyoming's Bighorn Mountains. A classic mountain ultramarathon with 21,000 feet of climbing and stunning high-altitude terrain.
Race Resources
Grade Profile Analysis
Analyze the Bighorn 100 course by grade steepness. See ascent and descent breakdown to optimize your race strategy.
ExploreOfficial Race Website
Registration, course maps, aid station info, and official race details.
bighorntrailrun.comTraining Resources
General ultramarathon training guidance, climb rate analysis, and preparation strategies.
ExploreQuick Facts
Location
Bighorn Mountains
Near Dayton, Wyoming
Elevation Range
4,600 - 9,400 ft
High altitude challenge
Qualifies For
Hardrock 100
Western States 100
Terrain
50%+ Runnable
Mixed trail and dirt road
About the Course
The Bighorn 100 is one of America's classic mountain ultramarathons, traversing the Bighorn National Forest in northern Wyoming. The course features a mix of single track trails, dirt roads, and stunning alpine scenery.
With over 50% of the climbing in the 0-5% grade band, the course is more runnable than many mountain 100s. However, the high altitude (reaching 9,400 feet) and typical June heat create significant challenges. The 5.7 miles of steep climbing (15%+) and technical descents require solid mountain running skills.
The race starts and finishes near Dayton, Wyoming, with multiple crew-accessible aid stations throughout the course. A 52-mile option is also available for those seeking a shorter but still challenging mountain experience.