About This Race
The 50K extends beyond the 30K's single loop to challenge runners with additional terrain and sustained effort over technical mountain trails. This distance demands experienced trail runners comfortable with longer climbs and descents, as the extended time on course requires strong pacing discipline and mental fortitude through the later miles. Runners seeking to step up from shorter trail distances will find this a substantial but achievable progression that tests both physical endurance and trail-specific skills.
The 30K follows the classic "Legend of Bear Pete" loop, gaining approximately 3,500 feet of elevation on technical alpine singletrack through the Payette National Forest. The 50K extends the challenge by beginning with the Willow and Jeanette Creek Trails, including a climb of Crystal Mountain before joining the Bear Pete loop to the finish.
Both courses showcase the demanding terrain that made the original IMTUF100 legendary among mountain ultrarunners. Runners navigate narrow singletrack, steep climbs, and technical descents while surrounded by the pristine wilderness of central Idaho's high country.
Elevation Profile
Elevation profile estimated from terrain data. Actual course may differ.
The course gains 3,501 ft over 31 miles, with the steepest section between mile 20–mile 20.
Location
Practical Info
Late June mountain weather in central Idaho can range from cool mornings to warm afternoons, with potential for afternoon thunderstorms at high elevation.
BOI - Boise Airport
Free dispersed camping available at Pete Creek Trailhead and Campground. Additional camping options nearby, plus lodging at Burgdorf Hot Springs and Secesh Stage Stop.
Best For
Notable Features
The race takes place on the original IMTUF100 course, widely regarded as one of America's most challenging mountain ultras. The combination of high-altitude singletrack, significant elevation gain, and remote wilderness setting creates an authentic mountain running experience. The race maintains the rugged character of Idaho mountain running with minimal amenities and maximum adventure.