River of No Return Endurance Runs

River of No Return Endurance Runs

Date: Saturday, June 20, 2026

Location: Challis City Park, Challis, ID (32K starts at Bayhorse)

Distances: 108K, 55K, 32K

Description: The River of No Return (RONR) Endurance Runs offer runners a unique opportunity to experience Idaho’s beauty. Choose between distances of 32k, 55k, or 108k, where you’ll be challenged by varying terrain and awed by gorgeous scenery. Designed to be tough and beautiful, the courses tour some big mountain climbs over 9000 feet. Elk, deer, eagles, bears and wolves add to the mystique of the River of No Return, as do the forgotten mines and mining communities, old Idaho traditions – all surrounded by the very supportive community of Challis. Runners will be treated to a fast finish down Main Street Challis and back to the Challis City Park. Enjoy the return to civilization in the last mile as the locals cheer you home! The course is crew-friendly with multiple aid stations that are support team-accessible without the use of four-wheel drive vehicles.

Courses

• 108K: Approx. 17,600' elevation gain, 9 aid stations. Large single-loop course with five significant climbs cresting 8000', 9000', and 10,000'. Mostly two-track, some dirt road, single track, and pavement finish. Start: 5:00 am. Time limit: 22 hours.
• 55K: Approx. 8800' elevation gain, 5 aid stations. Large lollipop-type loop with three major climbs over 8000'. Mostly narrow ATV trail, some dirt road, single track, and pavement finish. Start: 6:30 am. Time limit: 12.5 hours.
• 32K: Approx. 4500' elevation gain, 2 aid stations. Point-to-point from Bayhorse to Challis City Park, following the 55K route. Start: 9:00 am.

Support Crews

RONR highly encourages the use of support crews, especially in the 55K and 108K races. Crews will be treated to gorgeous drives along the Salmon River. Specific aid station access and pacing rules apply for each distance.

Refunds

• Full Refunds less -$20 given up to May 1.
• 50% refund after May 1.
• No refunds after June 1.

Part of the Idaho Trail Ultra Series.