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River of No Return Endurance Runs

Jun 20, 2026 at 6:00 AM

US-93 , Challis ID, 83226, USA

You Are Not at the Top of the Food Chain Here, so Better Run Fast!!

That’s right: The Wolf, the Coyote, the Fox, the Bear, the Cougar: you are not at the top of the food chain here, so Run Fast.

With a start and finish in Challis, Idaho, (32K Start-Bayhorse) 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.

Event History

2026
Jun 20, 2026
2025
Jun 14, 2025
2024
Jun 15, 2024
2023
Jun 17, 2023View Results →
2022
Jun 18, 2022View Results →
2021
Jun 19, 2021View Results →
2020
Jun 20, 2020View Results →
2019
Jun 15, 2019View Results →
2018
Jun 16, 2018View Results →
2017
Jun 17, 2017View Results →
2016
Jun 18, 2016View Results →
2015
Jun 20, 2015View Results →
2014
Jun 21, 2014View Results →

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