Date
Sat, 5 Dec 2026
Start
07:00
Venue
La Posta Quemada Ranch, Colossal Cave Mountain Park, Vail, Arizona
Vail, Pima County
Countdown
December
The full 50 miles, run as a double out-and-back, so you see the same ground twice. Modest climbing for the distance, which makes this one about pacing and patience.
Key facts
0115-hour cutoff, finish by 22:00
02No early start, everyone goes at 07:00
03Plan for the last hours to be in the dark
Create a free training plan for the Colossal Vail 50/50 81 km
7-day free trial, no card required
The course
The route
Vail
Distance81km
Total climb1,219m
StartElevation
0 kmDrag map to rotate66.1 km
Weather
Early-December, Vail
19°CTypical high
4°CTypical low
-7°CColdest in 20 years
11%Days with rain
Highs around 19°C and lows around 4°C, but it has dropped to -7°C. Rain on 11% of days. Pack for the cold end, not the average.
NASA POWER data, 2006-2025, the week either side of race day
2025 results
Who finishes, and how
#RiderTimeAvg speed
01Casey Mattix09:40:108.3 km/h
02Aden-Shiloh Broyles10:18:457.8 km/h
03Sarah Simmons11:10:047.2 km/h
17
Women finishers
12:20:21
Median time
6.5 km/h
Median speed
Women · 2025 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
Training
Training for the Colossal Vail 50/50 81 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Colossal Vail 50/50 81 km plan targets
Typical sessions
81 km with 1,219 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Colossal Vail 50/50 81 km plan.
7-day free trial, no card required.
Other races at Colossal Vail 50/50
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