IMTUF 100
IMTUF 100 is a rugged mountain hundred around McCall, combining remote Idaho singletrack, sustained climbing and a deeply established ultra community.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 23, 2026.
Quick facts
- Saturday start on September 19, 2026
- Rugged Idaho mountain hundred
- Remote singletrack and long climbs
- Established UltraSignup results history
2026 IMTUF 100 registration
Registration for the 2026 IMTUF 100 runs through the official registration page at ultrasignup.com.
About the IMTUF 100
The Idaho Mountain Trail Ultra Festival centers on one separately timed 100-mile race with its own qualification standards and results archive.
Course
Technical mountain trail, forest roads and high-country climbs create a demanding loop through the Payette region around McCall.
Race-day weather
Mid-September can shift from warm sun to freezing overnight temperatures, rain or early snow in the Idaho mountains.
Past IMTUF 100 dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Saturday, September 19, 2026 | Upcoming | — |
| 2025 | — | Completed | Open results |
| 2024 | — | Completed | Open results |
IMTUF 100 FAQ
When is the IMTUF 100?
The 2026 IMTUF 100 is on Saturday, September 19, 2026.
How do I register for the IMTUF 100?
Register for the IMTUF 100 through the official registration link: marathonscout.com/go/imtuf-100/register. It opens the race registration page at ultrasignup.com.
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