Fall ultramarathons in Idaho, United States

Last person standing format on a 4.167-mile loop each hour, emphasizing endurance, mental grit, and camaraderie until only one runner remains.

Remote, demanding mountain ultramarathon starting and finishing at Jug Mountain Ranch, featuring rugged terrain and long stretches between aid stations

Rugged 50k trail featuring varied terrain through forests, open fields, and rolling hills with technical sections and scenic vistas

Challenging 50K mountain route through City of Rocks and Castle Rocks, single-track trails, 1,500-foot climb, granite spires, panoramic summit views

Boise Foothills course featuring favorite local trails, starting and finishing at Military Reserve, 50 miles through scenic Idaho landscapes

Diverse terrain from dense forests to alpine areas, steep climbs and demanding descents, 7,000 feet of elevation gain, reaching 8,550 feet high point

Challenging 50k on technical single-track and logging roads along Moscow Mountain, featuring significant elevation and Palouse vistas.

Scenic loop course through Ponderosa State Park, featuring accessible trail terrain and a community-focused atmosphere

Rugged Idaho trail 50K with singletrack, double track, gravel road, about 6,000 ft of gain, and the climb to Prospector Peak.