Embark on an unforgettable journey through Idaho's rugged heartland at the River of No Return Endurance Runs on June 20, 2026, in Challis, ID. Offering challenging distances of 108K, 55K, and 32K, this event is renowned for its remote beauty and demanding terrain. Participants will traverse a landscape cradled by the Salmon River to the south and the Frank Church Wilderness to the north, experiencing a true backcountry adventure.

The courses are meticulously designed to be both tough and breathtaking, featuring significant mountain climbs that crest over 9,000 feet, particularly for the longer distances. The 108K boasts approximately 17,600 feet of elevation gain with five major ascents, while the 55K includes around 8,800 feet over three climbs. Runners will navigate a mix of two-track ATV trails, dirt roads, and single-track elk trails, passing historic sites like the Bayhorse ghost town and the abandoned Pacific Mine. Keep an eye out for abundant wildlife, including elk, deer, eagles, bears, and even wolves, adding to the mystique of this wild frontier. Aid stations are plentiful and crew-friendly, ensuring support throughout your journey.

Runners consistently describe the River of No Return as a relentless course, demanding mental and physical fortitude with its long, continuous uphills and downhills. The event culminates with a triumphant final mile down Main Street Challis, where locals cheer you toward the finish line at Challis City Park. Typical race day conditions in late June bring highs around 79°F and lows near 47°F, with a minimal 4% chance of precipitation, providing ideal weather for pushing your limits in this spectacular Idaho wilderness.