100mi ultramarathons in Idaho, United States

Backcountry courses in the Pioneer Mountains featuring rugged trails, steep ascents up to 11,000 feet, long aid station gaps, and alpine scenery

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

Flat, scenic dirt trail loop at Eagle Island State Park near Boise, Idaho

Demanding 50- and 100-mile mountain routes over Scout Mountain, with tough climbs, rugged scenery, and high-country terrain in southeast Idaho.