Idaho Mountain Trail Ultra Festival (IMTUF 100)
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IMTUF 100 - Idaho Mountain Trail Ultra Festival
The IMTUF 100 is the 15th annual mountain ultrarunning event held September 19-20, 2026, with courses that start and finish at Jug Mountain Ranch just south of McCall, Idaho. Organizers state they will run the same courses used in previous years.
The event includes the following distances:
- 100 Miler
- 20 Miler
For 2026 IMTUF continues to serve as a qualifier for both the Hardrock 100 and the Western States 100. Organizers describe the race as mountain adventure running with a committing feel; runners may be many miles and many hours away from help and should review the waiver carefully because the event is not appropriate for those who want minimal uncertainty.
Registration information and refund rules are specified by the organizers. Registration opens January 2, 2026, and registration closes September 13, 2026 at 11:59 PM PT. The refund policy states a 50% refund is available until July 1, 2026 at 11:59 PM; after that date there are no refunds, no rollover or transfer of bibs, and no refunds if the race must be cancelled due to fire or severe weather. Organizers note they may consider individual financial hardship on a case by case basis. Visit the organization's website for the most recent information.
