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Routes
Mountain biking trails
United States
California
Los Angeles County
Altadena

El Prieto Trail – Andrea Wilson Triangle loop from John Muir High School

Routes
Mountain biking trails
United States
California
Los Angeles County
Altadena

El Prieto Trail – Andrea Wilson Triangle loop from John Muir High School

Hard

4.7

(9974)

12,397

riders

El Prieto Trail – Andrea Wilson Triangle loop from John Muir High School

01:47

18.7km

520m

Mountain biking

Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike. The starting point of the route is accessible with public transport.

Last updated: August 19, 2026

Tips

Temporary access restrictions

Includes segments with temporary access restrictions.

After 13.7 km for 1.86 km

Open: • 6:00 AM-8:00 PM (otherwise closed)

Waypoints

A

Start point

Bus stop

Get Directions

1

10.1 km

El Prieto Trail

Highlight • Trail

El Prieto Trail is a sweet singletrack with lots of switchbacks, stream crossings and rock gardens. Intermediate riders will love it.

Tip by

2

15.0 km

Andrea Wilson Triangle

Highlight • Natural Monument

Andrea Wilson Triangle is a small protected area along Chaney Trail in Altadena. Though not a developed trail, it’s part of a larger effort to preserve open space and wildlife habitat in the foothills near Angeles National Forest.

Tip by

B

18.7 km

End point

Bus stop

Loading

Way Types & Surfaces

Way Types

7.04 km

5.54 km

3.45 km

1.65 km

1.01 km

< 100 m

Surfaces

7.10 km

6.43 km

3.21 km

1.64 km

258 m

133 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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