Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 4:00 finish (an estimate) · starting 7:00 AM Apr 11. Dark means the sun below civil twilight.
Climbs
1 climb · 527 ft totalbiggest firstConditions typical race-day weather for Apr 11 at the start
Typical = the median of 2016–2025 for Apr 11 ±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 Sun, Apr 11, 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
Peterson Ridge Rumble 20 Miler — 2027 covers 19.7 mi (31.7 km) with 1,004 ft of elevation gain. That is about 51 ft per mile of climbing, and 1,006 ft of descent. The course tops out at 3,807 ft and bottoms out at 3,214 ft. The profile has 1 sustained climb; the only one is the climb from mi 3.9, +527 ft over 4.7 mi at 2.1% on average (steepest stretch 12%). Race day is April 11, 2027, starting at 7:00 AM; the sun rises at 6:31 AM and sets at 7:45 PM. Typical race-day weather at the start: a high of 52°F and a low of 32°F, with a 44% 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
- Oct 29, 2026Added to the catalog
Races like this one close in distance, climbing, terrain, altitude, weather and season
- Peterson Ridge Rumble Marathon — 2027Apr · 26 mi · 58 ft/miSimilar weather · Similar climbing · Same month
- Behind the Rocks Ultra 30K — 2027Apr · 19 mi · 78 ft/miSame distance · Same month · Similar climbing
- Ancient Lakes Trail Run — 2026Apr · 17 mi · 70 ft/miSame distance · Same month · Similar climbing
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