IMTUF 100 Course Profile

Burgdorf, ID, Idaho

• Distance: 100 miles
• Elevation Gain: 22,000 ft
• Elevation Loss: 22,000 ft
• High Point: 8,800 ft
• Low Point: 6,200 ft
• Time Limit: 36 hours
• Month: October
• Finisher Rate: ~55%

The Idaho Mountain Trail Ultra Fest is a remote 100-mile loop through the mountains near the Frank Church Wilderness in central Idaho. The course features steep climbs, river crossings, and some of the most isolated terrain of any US 100-miler.

Aid Stations

Name	Mile	Elevation	Crew Access	Drop Bag	Cutoff
Chinook Campground	18	7,200 ft	Yes	Yes	—
Lake Creek	35	6,800 ft	No	Yes	14:00
Loon Creek Summit	55	8,400 ft	Yes	Yes	20:00
Warm Lake	72	7,000 ft	Yes	Yes	26:00
Boiling Springs	88	6,600 ft	Yes	Yes	31:00

Course Segments

Segment	Miles	Terrain	Difficulty	Notes
Burgdorf to Chinook	0–18	climb	moderate	Gradual climb into the backcountry.
Chinook to Loon Creek Summit	18–55	mixed	hard	Remote wilderness. River crossings possible.
Loon Creek to Warm Lake	55–72	descent	hard	Technical descent through dense forest.
Warm Lake to Burgdorf	72–100	rolling	hard	Final push through the Idaho night.

View the full interactive elevation profile, 3D course flyover, and race strategy tools on HARDN.