El Prieto to Brown Mountain Loop

Dogs Leashed

Features Fall Colors · River/Creek · Views · Wildflowers · Wildlife

The best moderate loop in the Pasadena/Altadena front range of the San Gabriels. Although the El Prieto climb is a bit challenging, it's wooded, crosses multiple streams, and is pretty. The descent on Brown Mountain Road and Fern Truck Trail isn't too steep, has nice views, and can be done pretty fast.

Rocky, rooty, and a challenging uphill.

This loop has a challenging ascent. Watch out for mountain bikers descending the El Prieto Trail. It is generally easy to let them pass, and they are always friendly, because it's a great trail.

From the parking lot near the JPL entrance, follow the paved trail that turns to a dirt road for about 1.25 miles. Take the right fork towards El Prieto/Brown Mountain for about 0.25 miles, then stay right onto El Prieto.

Follow this steep trail for about 2 miles until you reach Brown Mountain Fire Road. Turn left here and climb up to the saddle between Brown Mountain Fire Road and Fern Truck Trail. Descend down Fern Truck Trail (also called Brown Mountain; the left-most trail when you reach the saddle) back to the junction where you took El Prieto, and head back the way to came to the parking lot.

You can also do the loop in reverse, but running down El Prieto is a little less desirable. You can also add an out-and-back from the Brown Mountain Saddle towards Ken Burton Trail if you are looking for a longer run. El Prieto has a few off-shoots, but they'll all reach Brown Mountain eventually.

Might see some coyotes, deer, and rabbits.