Brown Mountain / JPL

Loop • 9.7 mi • 1400 ft

Located in the Angeles National Forest, above the foothills in Altadena. Highlights: The trail starts just above NASA's Jet Propulsion Laboratory. Hazards: Poison oak and rattlesnakes.
Download Trail Guide
View Topo Map
Activity Type: Mountain Biking
Nearby City: Altadena
Length: 9.7 total miles
Elevation Gain: 1,400 feet
Trail Type: Loop/Lollipop
Skill Level: Aerobic level: Moderate. Technical difficulty: Moderate to difficult.
Duration: 1.3 hours
Trailhead Elevation: 1,100 feet
Top Elevation: 2,300 feet
Local Contacts: Angeles National Forest, Arroyo Seco Ranger District (818) 790-1151
Local Maps: USGS Pasadena, Mount Wilson; Thomas Brothers, Los Angeles County.
Trail Photos
Got photos of this trail?  Upload Now
View All Photos

Recent Trail Reviews


El Prieto ROCKS! The Brown Mountain uphill ride on the fire road is simply a warm up. As soon as you cross the saddle you are heading downhill to the entrance to El Prieto Canyon. It has some great techy-rocky sections, switchbacks, water crossings, and is all single track. My only complaint is that it is too short!


You just got to love this place. the climb is long(bring plenty water)but the prirto single track is all worth it when you are ziping along in and out as you make your way down. one of the best short single tracks with differnt plants along the trail from catuss to poison oak it has it all.

View All Reviews