Event Overview
| Date | Sep 19-20, 2026 |
|---|---|
| Location | McCall, Idaho, USA |
| Format | Fixed-Distance |
| Terrain | Mountain |
| Region | North America |
| Distance | 100 mi |
| State / area | Idaho (ID) |
| Course model | Loop |
| Cutoff | 36 hours |
| Start | 6:00 AM Saturday |
| Highlights | Hardrock Qualifier, Western States Qualifier |
Course & Terrain
Mountain trail race starting and finishing at Jug Mountain Ranch south of McCall.
Entry & Logistics
| Registration and fees | Check the official event website for current availability, deadlines, prices, taxes, and refund terms. |
|---|
Why This Race Matters
IMTUF 100 is a useful reference point for runners comparing long fixed-distance ultras that still unfold over multiple days. Its format, terrain, and support model shape the kind of preparation required: not just fitness, but pacing discipline, nutrition planning, foot care, and the ability to make good decisions under fatigue.
Planning Notes
- Prepare for sleep decisions, weather swings, and aid-station discipline. The distance is only one part of a multi-day fixed-distance race.
- Treat intermediate cutoff gates as part of the course. Build enough margin for aid stops and late-race slowdown, and verify every current gate in the official rules.
- Train for terrain-specific fatigue. Technical trails and mountain courses demand downhill durability, hiking efficiency, and reliable night lighting.
- The directory does not mark this as having simpler logistics. Confirm qualification, terrain, support, registration, medical, and withdrawal requirements before planning around it.
Related Preparation
- Compare verified US 100-mile races
- Compare this race in the full 2026 calendar
- Open the 100-Mile format guide
- Open the Fixed-Distance format guide
- Compare all race formats
- Use the multiday pace calculator
- Build a race-specific gear checklist
Verification & Sources
Verification scope: the listed edition's date, location, format, and available logistics were checked against the event-specific official sources below during the directory review dated August 18, 2026. Organizers can revise details after review.
- Official IMTUF site — https://www.imtuf100.com/
- Official registration listing — https://ultrasignup.com/register.aspx?did=133939
- Multiday Running event directory review scope: August 18, 2026.