September 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