River Of No Return Endurance Runs

The River of No Return Endurance Runs, held in Challis, Idaho, offers challenging trail races of 32K, 55K, and 108K distances. Set against Idaho’s stunning wilderness, the courses feature significant elevation gains—up to 17,600 feet for the 108K—with climbs reaching over 10,000 feet. Runners traverse diverse terrain including ATV trails, single track, dirt roads, and pavement, passing through remote mountain landscapes rich with wildlife and historic mining sites. The 32K starts at the ghost town of Bayhorse, while the 55K and 108K begin and end at Challis City Park. The event is crew-friendly with multiple aid stations accessible by support teams, and finishes with a spirited run down Main Street Challis amid local cheers. Visit the organization's website for the most recent information.