Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 20:20 finish (an estimate) · starting 7:00 AM Jan 16 · dark at the start until mi 0.5 · headlamp mi 55–the finish. Dark means the sun below civil twilight.
Climbs
7 climbs · 2,485 ft totalbiggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 5,391ft | -32% |
| USGS lidar, 1 m | 7,944ft | 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 24, 2026. The planner still uses the course file.
Aid stations as published on the course file
| Aid station | Mile | km |
|---|---|---|
| Start/Finish (lap 1) | 0.0 | 0.0 |
| A Gila Aid (lap 1) | 5.6 | 9.0 |
| A Rumble HQ Aid (lap 1) | 9.8 | 15.8 |
| A Start/Finish (lap 2) | 10.0 | 16.1 |
| A Gila Aid (lap 2) | 15.6 | 25.1 |
| A Rumble HQ Aid (lap 2) | 19.8 | 31.9 |
| A Start/Finish (lap 3) | 20.0 | 32.2 |
| A Gila Aid (lap 3) | 25.6 | 41.2 |
| A Rumble HQ Aid (lap 3) | 29.8 | 48.0 |
| A Start/Finish (lap 4) | 30.0 | 48.3 |
| A Gila Aid (lap 4) | 35.6 | 57.3 |
| A Rumble HQ Aid (lap 4) | 39.8 | 64.1 |
| A Start/Finish (lap 5) | 40.0 | 64.4 |
| A Gila Aid (lap 5) | 45.6 | 73.4 |
| A Rumble HQ Aid (lap 5) | 49.8 | 80.2 |
| A Start/Finish (lap 6) | 50.0 | 80.5 |
| A Gila Aid (lap 6) | 55.6 | 89.4 |
| A Rumble HQ Aid (lap 6) | 59.8 | 96.3 |
| A Start/Finish (lap 7) | 60.0 | 96.5 |
| A Gila Aid (lap 7) | 65.6 | 105.5 |
| A Rumble HQ Aid (lap 7) | 69.8 | 112.4 |
| A Start/Finish (lap 8) | 70.0 | 112.6 |
| A Gila Aid (lap 8) | 75.6 | 121.6 |
| A Rumble HQ Aid (lap 8) | 79.8 | 128.5 |
| A Start/Finish (lap 9) | 80.0 | 128.7 |
| A Gila Aid (lap 9) | 85.6 | 137.7 |
| A Rumble HQ Aid (lap 9) | 89.8 | 144.6 |
| A Start/Finish (lap 10) | 90.0 | 144.8 |
| A Gila Aid (lap 10) | 95.6 | 153.8 |
| A Rumble HQ Aid (lap 10) | 99.8 | 160.7 |
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 Jan 16 at the start
Typical = the median of 2016–2025 for Jan 16 ±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, Jan 16, 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
Coldwater Hundred 100 Miler — 2027 covers 100.0 mi (161.0 km) with 5,391 ft of elevation gain through Arizona, United States. That is about 54 ft per mile of climbing, and 5,391 ft of descent. The course tops out at 1,450 ft and bottoms out at 1,004 ft. The surface is 100% gravel. There are 29 aid stations on course; the longest stretch between aid is 5.6 mi. The profile has 7 sustained climbs; the biggest is the climb from mi 12.3, +399 ft over 2.5 mi at 3.1% on average (steepest stretch 4%). Race day is January 16, 2027, starting at 7:00 AM; the sun rises at 7:34 AM and sets at 5:46 PM. Typical race-day weather at the start: a high of 66°F and a low of 44°F, with a 10% 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
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