Idaho Mountain Trail Ultra Festival (IMTUF 100)

The Idaho Mountain Trail Ultra Festival (IMTUF 100) is a challenging mountain ultramarathon held annually near McCall, Idaho, starting and finishing at Jug Mountain Ranch. The 14th edition in 2025 features a 100-mile race beginning Saturday morning and a 20-mile race on Sunday. Known for its rugged, remote terrain, IMTUF offers a serious mountain adventure with significant risks for the unprepared.

It serves as a qualifier for prestigious ultras like Hardrock 100 and Western States 100, attracting experienced runners seeking a demanding and committing race experience. The event emphasizes safety, preparation, and respect for the mountain environment. Visit the organization's website for the most recent information.