Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 10:20 finish (an estimate) · starting 7:00 AM Apr 3. Dark means the sun below civil twilight.
Climbs
6 climbs · 2,792 ft totalbiggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 4,290ft | -8% |
| USGS lidar, 1 m | 4,686ft | 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 23, 2026. The planner still uses the course file.
Aid stations as published on the course file
| Aid station | Mile | km |
|---|---|---|
| Start/Finish | 0.0 | 0.0 |
| A Pit Aid Station | 6.0 | 9.7 |
| A Gatherer Aid Station | 15.5 | 24.9 |
| A Oasis Aid Station | 23.3 | 37.5 |
Badge colours match the markers on the map above — always confirm locations and cutoffs with the race organizer.
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Conditions typical race-day weather for Apr 3 at the start
Typical = the median of 2016–2025 for Apr 3 ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.
Race almanac the sky on race day
Next race day Sat, Apr 3, 2027 · 7:00 AM start
First and last light are civil twilight, the sun 6° below the horizon. The moon is lit as at midnight after the start; headlamp hours count a typical finish from the start while the sun is below civil twilight. Worked out for the start line.
Reviews what runners who have been there say
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About this course
Behind the Rocks Ultra 50 Miler — 2027 covers 50.2 mi (80.8 km) with 4,290 ft of elevation gain through Utah, United States. That is about 85 ft per mile of climbing, and 4,303 ft of descent. The course tops out at 5,571 ft and bottoms out at 4,111 ft. The surface is 94% gravel and 6% trail. There are 3 aid stations on course; the longest stretch between aid is 26.9 mi. The profile has 6 sustained climbs; the biggest is the climb to Oasis Aid Station, +948 ft over 4.7 mi at 3.8% on average (steepest stretch 8%). Race day is April 3, 2027, starting at 7:00 AM; the sun rises at 7:01 AM and sets at 7:43 PM. Typical race-day weather at the start: a high of 61°F and a low of 37°F, with a 13% 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.
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Course history
- Sep 3, 2026Added to the catalog
Races like this one close in distance, climbing, terrain, altitude, weather and season
- West Texas Ultra — 2026Apr · 50 mi · 81 ft/miSame distance · Similar climbing · Same month
- Moab Red Hot Ultra 50 Miler — 2027Feb · 53 mi · 110 ft/mi · UTSimilar terrain · Same distance · Same state
- Thelma and Louise Marathon and Half 50K — 2027Apr · 30 mi · 73 ft/mi · UTSimilar terrain · Similar climbing · Same month
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