Challis, ID, United States · Saturday, June 19, 2027

Fixed Distance 50K

River of No Return Endurance Run 53K

262 days away

55 km Distance

2,300 m Climbing

6.2 Grit · Hardcore

44.5046° N, 114.2317° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 42 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Time limit 12 hours 13:05 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 61% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~97 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2026 edition (55km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, June

Daytime high 19°C

Night low 4°C

Rainfall Mostly dry

Daylight 15 h 33 m of light

Regional 2001-2020 average for June — NASA POWER, grid elevation 2207 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2026	55km	97	Jakub Galczynski · 05:19:23	Codie Muthig · 06:12:40
2025	55km	92	Zeke Wilson · 05:48:46	Leigh Anne Wasteney · 06:18:58
2024	53km	95	Alexander Parker · 05:27:45	Sophia Forstag · 06:36:52
2023	53km	81	Alfredo Asuzano · 05:47:48	Jenna Maffey · 06:35:56
2022	53km	89	Taylor Farnsworth · 05:39:51	Megan Rolland · 05:55:53
2021	53km	109	Jeff Mogavero · 04:49:58	Mary Kate McGuire · 05:55:55
2019	53km	124	Michael Foote · 05:17:22	Alexis Crellin · 05:57:25
2018	50km	126	Giff Walters · 04:30:09	Emily Sullivan · 05:21:49
2017	50km	113	Chris Lundberg · 04:55:58	Danielle Marquette · 05:04:55
2016	50km	109	Gray Augustus · 04:23:29	Andrija Barker · 04:55:22

The field grew 5% between 2025 (92) and 2026 (97). 30% of the 2026 field were women.

DUV results for the 2026 edition (55km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a mountain course. Poles are highly recommended for the sustained climbs.

By UltraHub Expert

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Gear for this race

Chosen for 55 km of trail with 2,300 m of ascent.

Trail Running Shoes 42 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition 55 km of self-supported fuelling between aid stations.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 2,300 m of ascent to walk up.
Headlamps A 12 h limit puts you out there after dark.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Brooks

Catamount 3

RunRepeat found the Brooks Catamount 3 to have a cozier upper that enhances the overall fit, though breathability and durability could be better. iRunFar noted…

★★★★★ 4.5

Skratch Labs