Ultra Running Hub Vail, AZ, United States · Saturday, December 5, 2026
Fixed Distance 50K
Colossal Vail 50 Km
80 days away
55 km Distance
not publishedn/a Climbing
2.8 est Grit · Entry level
Calculated from 55 km alone — the organiser has not published an elevation profile. Read 2.8 as a floor, not a verdict.
What the course asks
Time limit 9 hours
9:49 min/km average. Comfortable. Room to walk the climbs and stop at aid. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 80% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →
Field size ~64 Mid-sized. Company early, well spread out by halfway.
DUV results for the 2025 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, December
Daytime high 14°C
Night low 0°C
Rainfall Dry — rain unlikely
Daylight 10 h 10 m of light
Regional 2001-2020 average for December — NASA POWER, grid elevation 1262 m. Not a forecast.
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 55 km of trail.
- Trail Running Shoes55 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition55 km of self-supported fuelling between aid stations.
- Hydration VestsFlask capacity for 55 km, without the bounce.
- GPS WatchesBattery life first — a 55 km day outlasts most full-GPS modes.
Course Notes
The run starts in La Posta Quemada Ranch in Colossal Cave Mountain Park.
Similar races
Other 50K trail ultras, closest in distance first.