Idaho Mountain Trail Ultra Festival (IMTUF 100)
McCall, United States • 19-20 Sep 2026
IMTUF 100 : Idaho Mountain Trail Ultra Festival
The IMTUF 100 is a mountain ultramarathon event held for the 15th time on September 19 to 20, 2026 near McCall, Idaho. Courses start and finish at Jug Mountain Ranch, just south of McCall. The event offers two race distances:
- 100 Miler
- 20 Miler
Registration opens January 2, 2026 and closes September 13, 2026 at 11:59 PM PT. The organizers list entry fees and availability; entry prices vary. The race is a qualifier for the Hardrock 100 and for the Western States 100.
The organizers describe the courses as remote mountain running with long distances between aid and help. They advise that the race requires substantial preparation and that it may not be appropriate for runners seeking an experience without remoteness or uncertainty. The event is presented as having a committing feel with potential consequences for the unprepared.
The published refund policy states that 50 percent of the entry fee will be refunded until July 1, 2026 at 11:59 PM. After that date there are no refunds, no bib rollovers or transfers, and no refunds or rollovers if the race is cancelled for reasons such as fire or severe weather. The organizers note that runners facing personal financial hardship may contact them. Visit the organization's website for the most recent information.