River Of No Return Endurance Runs

The River of No Return Endurance Runs is a challenging ultramarathon event held in Challis, Idaho, featuring distances of 32K, 55K, and 108K. Participants traverse rugged terrain, including mountain climbs over 9,000 feet, scenic ATV trails, dirt roads, and single-track trails, offering stunning views of Idaho’s wilderness and wildlife. The courses pass through historic mining communities and remote landscapes, culminating in a fast finish down Challis’s Main Street. The event emphasizes support for runners with multiple aid stations accessible to support crews. It is part of the Idaho Trail Ultra Series and celebrates the region’s natural beauty and rugged outdoor spirit. Visit the organization's website for the most recent information.