Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 6:50 finish (an estimate) · starting 7:00 AM Aug 22. Dark means the sun below civil twilight.
Climbs
3 climbs · 928 ft totalbiggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 4,931ft | +39% |
| USGS lidar, 1 m | 3,559ft | 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 30, 2026. The planner still uses the course file.
Aid stations as published on the course file
| Aid station | Mile | km |
|---|---|---|
| START SCAL | 0.0 | 0.0 |
| A 50K FINAL | 3.5 | 5.6 |
| A RED RIBBON | 3.5 | 5.6 |
| AID STATIO | 31.1 | 50.0 |
| FINISH WAT | 31.1 | 50.0 |
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 Aug 22 at the start
Typical = the median of 2016–2025 for Aug 22 ±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 84°F at the start, with a low of 63°.
| Year | Start °F | Rain | Wind | Heat index |
|---|---|---|---|---|
| 2026 Aug 22 | 84°/63° | dry | 9mph | 81° |
race-day weather from the Open-Meteo historical archive (ERA5) at the start line.
Reviews what runners who have been there say
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About this course
Trail Run at Sly Park - Summer 50K — 2026 covers 31.1 mi (50.0 km) with 4,931 ft of elevation gain. That is about 159 ft per mile of climbing, and 4,944 ft of descent. The course tops out at 3,852 ft and bottoms out at 3,432 ft. There are 2 aid stations on course; the longest stretch between aid is 27.6 mi. The profile has 3 sustained climbs; the biggest is the climb from mi 18.6, +361 ft over 1.0 mi at 6.8% on average (steepest stretch 34%). Race day is August 22, 2026, starting at 7:00 AM; the sun rises at 6:23 AM and sets at 7:49 PM. Typical race-day weather at the start: a high of 84°F and a low of 59°F, with a 7% 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
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