River of No Return Endurance Runs
June 20th 2026
Challis, ID
55 KM |
108 KM
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!
Upcoming Races
Jun 20 2026
55 KM
9,300
9,300
ft.
Mixture
5 Aid
Stations
14:00 Cutoff
5
Elevation Rating
Mountainous, >12,500 feet in 50 miles
3
Surface Rating
Some rocks, root, and/or ruts
Jun 20 2026
108 KM
15,100
15,100
ft.
Single Loop
9 Aid
Stations
22:00 Cutoff
5
Elevation Rating
Mountainous, >12,500 feet in 50 miles
3
Surface Rating
Some rocks, root, and/or ruts
Additional Distances
This event also has the following sub ultra distances
32 KM
Results
108 KM
| Date | Finishers | Top Result (F) | Top Result (M) |
|---|---|---|---|
| 06/14/25 | 60 | 12:54:48 | 10:58:42 |
| 06/15/24 | 67 | 14:56:25 | 11:11:20 |
| 06/17/23 | 53 | 13:20:01 | 12:58:33 |
| 06/18/22 | 32 | 15:53:58 | 12:44:39 |
| 06/19/21 | 57 | 13:42:05 | 11:03:34 |
| 06/20/20 | Race Cancelled | ||
| 06/15/19 | 43 | 14:37:03 | 12:18:46 |
| 06/16/18 | 41 | 16:30:37 | 13:26:58 |
| 06/17/17 | 40 | 17:31:24 | 12:37:18 |
| 06/18/16 | 50 | 15:39:34 | 13:21:03 |
| 06/20/15 | 45 | 14:10:38 | 12:13:25 |
55 KM
| Date | Finishers | Top Result (F) | Top Result (M) |
|---|---|---|---|
| 06/14/25 | 92 | 6:18:58 | 5:48:46 |
| 06/15/24 | 95 | 6:36:52 | 5:27:45 |
| 06/17/23 | 81 | 6:35:56 | 5:47:48 |
| 06/18/22 | 89 | 5:55:53 | 5:39:51 |
| 06/19/21 | 111 | 5:55:55 | 4:49:58 |
53 KM
| Date | Finishers | Top Result (F) | Top Result (M) |
|---|---|---|---|
| 06/20/20 | Race Cancelled | ||
| 06/15/19 | 124 | 5:57:25 | 5:17:22 |
50 KM
| Date | Finishers | Top Result (F) | Top Result (M) |
|---|---|---|---|
| 06/16/18 | 126 | 5:21:49 | 4:30:09 |
| 06/17/17 | 113 | 5:04:55 | 4:55:58 |
| 06/18/16 | 109 | 4:55:22 | 4:23:29 |
| 06/20/15 | 133 | 4:52:52 | 4:09:32 |
| 06/21/14 | 104 | 4:57:54 | 3:52:15 |
100 KM
| Date | Finishers | Top Result (F) | Top Result (M) |
|---|---|---|---|
| 06/21/14 | 60 | 11:48:13 | 9:15:28 |