Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 6:55 finish (an estimate) · starting 7:00 AM Dec 6. Dark means the sun below civil twilight.
Climbs
3 climbs · 1,075 ft totalbiggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 2,183ft | -7% |
| USGS lidar, 1 m | 2,349ft | reference |
They differ because a GPS file picks up noise on every wiggle and often takes its heights from a coarse terrain model, while lidar maps the ground itself to about a metre. We sampled this route every 98 ft against USGS 3DEP and counted each rise of 10 ft or more, on Oct 26, 2026. The planner still uses the course file.
Conditions typical race-day weather for Dec 6 at the start
Typical = the median of 2016–2025 for Dec 6 ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.
Race almanac 1 year of this race
Past editions
On race day it reached 62°F at the start, with a low of 37°.
| Year | Start °F | Rain | Wind |
|---|---|---|---|
| 2025 Dec 6 | 62°/37° | dry | 8mph |
race-day weather from the Open-Meteo historical archive (ERA5) at the start line.
Reviews what runners who have been there say
No reviews yet — be the first to run it and tell other runners what to expect.
About this course
Colossal-Vail 50/50 — 2025 covers 33.5 mi (53.9 km) with 2,183 ft of elevation gain. That is about 65 ft per mile of climbing, and 2,192 ft of descent. The course tops out at 4,182 ft and bottoms out at 3,312 ft. The profile has 3 sustained climbs; the biggest is the climb from mi 9.3, +532 ft over 6.3 mi at 1.6% on average (steepest stretch 11%). Race day is December 6, 2025, starting at 7:00 AM; the sun rises at 7:11 AM and sets at 5:19 PM. Typical race-day weather at the start: a high of 64°F and a low of 43°F, with a 9% chance of a wet day. The interactive map above shows the full route with its elevation profile and aid stations, built from the course's GPS file.
Load the course in the TrailGoat Run Planner for grade-adjusted pacing, climb-by-climb splits, hourly weather and a full hydration & fueling plan — free, no account needed.
Race director? — one line of HTML, always up to date.
Course history
- Oct 13, 2026Added to the catalog
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