Fort Collins, CO, United States · Saturday, October 31, 2026

Timed 12 hours

Colorado 12 Hour Run

31 days away

not publishedn/a Distance

not publishedn/a Climbing

not publishedn/a Grit

We hold no course length for this race — a timed or backyard event is measured by the clock, not the kilometre — so there is no Grit score to give you.

40.5853° N, 105.0844° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~19 Tiny. You will run alone for most of it.

DUV results for the 2025 edition (12h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, October

Daytime high 17°C

Night low 2°C

Rainfall Mostly dry

Daylight 10 h 32 m of light

Regional 2001-2020 average for October — NASA POWER, grid elevation 1773 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	12h	19	Luke Peterson · 82.076 km	Elizabeth Banister · 94.951 km
2024	12h	24	Nicholas Horton · 125.528 km	Sara Emmerich · 82.076 km

The field shrank 21% between 2024 (24) and 2025 (19). 63% of the 2025 field were women.

DUV results for the 2025 edition (12h) — ranked runners 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 this trail race.

Trail Running Shoes Cushioning on trail that is still there in the last quarter.
Race Nutrition Self-supported fuelling between aid stations.
Hydration Vests Flask capacity without the bounce.
Headlamps A 12 h limit puts you out there after dark.
GPS Watches Battery life first — an ultra outlasts most full-GPS modes.