Aspen Backcountry

Race completed

50 km Distance

not publishedn/a Climbing

2.5 est Grit · Entry level

Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.

39.1911° N, 106.8175° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 9.5 hours 11:24 min/km average. Generous. Walkable throughout for most of the field. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. About average for a 50K. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~123 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2026 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, August

Daytime high 19°C

Night low 4°C

Rainfall Mostly dry

Daylight 14 h 14 m of light

Regional 2001-2020 average for August — NASA POWER, grid elevation 3268 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2026	50km	123	John Herrick · 04:23:06	Juliette Soule · 04:49:35
2025	50km	49	Kevin Carson · 04:30:19	Mary Baughman · 04:55:19

The field grew 151% between 2025 (49) and 2026 (123). 28% of the 2026 field were women.

DUV results for the 2026 edition (50km) — 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

👟 gear

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

By UltraHub Expert

Gear for this race

Chosen for 50 km of trail.

Trail Running Shoes 50 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 50 km, without the bounce.
GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.

Adidas

Terrex Speed Ultra

RunRepeat found the Adidas Terrex Speed Ultra to have a grippy outsole and great lockdown, while iRunFar noted that the shoe works on a variety of trail conditi…

★★★★★ 4.5

La Sportiva

Prodigio Pro

RunRepeat found the La Sportiva Prodigio Pro to have a secure, locked-in fit due to its premium upper, and also praised the shoe's energetic ride, particularly…

$225 ★★★★★ 4.6

Tailwind