Upper Altadena Crest Trail

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View of the San Gabriel Mountains from the Altadena Crest Trail, Pasadena, CA
View of the San Gabriel Mountains from the Altadena Crest Trail
Ocean view from the Altadena Crest Trail, San Gabriel Valley, CA
Dusk over the ocean from the top of the Altadena Crest Trail

Upper Altadena Crest Trail

  • Location: Staging area on the north side of Loma Alta Drive at the intersection with Dabney St. From I-210, take the Lincoln Ave. exit and head north for 1.9 miles. Turn right on Loma Alta Drive and go 0.2 miles to the staging area on the north side of the road, across from Loma Alta Park.
  • Agency: Arroyos & Foothills Conservancy/County of Los Angeles
  • Distance: 3.2 miles
  • Elevation gain: 1,050 feet
  • Suggested time: 2 hours
  • Difficulty rating: PG
  • Best season: October – June (sunrise to sunset)
  • USGS topo map: Mt. Wilson
  • Recommended gear: sun hat; hiking poles
  • More information: Everytrail report here; LA County Trails page here
  • Rating: 6
Altadena Crest Trail Head, Pasadena, CA
0:00 – Trail head at the Loma Alta Staging Area (click thumbnails to see the full sized versions)

This northwestern segment of the Altadena Trail connects Loma Alta Drive with Mt. Lowe Road, climbing about 800 vertical feet with a few ups and downs, adding up to a fairly vigorous workout. The trail’s convenient location and panoramic views make it a worthwhile excursion for anyone in the San Gabriel and San Fernando Valleys; it’s not far from downtown L.A. either.

From the staging area, follow the signed trail leading alongside the debris basin. The first few hundred yards might not seem promising but you quickly climb away from civilization, reaching the top of a ridge a quarter mile from the start. From here, you descend to a T-junction. Take a hard right and head into a shallow canyon. Stay straight, ignoring the cut switchback on the left and make your way up to another ridge, taking in some nice views of the San Gabriel Mountains dead ahead.

Fall colors on the Altadena Crest Trail, San Gabriel Valley, CA
0:09 – Heading right at the T-junction (times are approximate)

After another brief descent, you begin a steady climb to a Y-junction (0.9 miles from the start). Bear left and continue climbing a quarter mile to reach the paved Chaney Trail. The trail continues on the opposite side of the road and a wooden step makes a nice resting spot before the steep ascent ahead.

View of the mountains from the Altadena Crest Trail, San Gabriel Foothills, CA
0:24 – Bear left at the Y-junction

The trail continues its climb, quite steeply at times and over increasingly loose and washed out terrain. The good news is that for your efforts you are rewarded with views that are wider and wider, as well as an interesting aerial perspective on Cheney Trail. Finally the grade levels out you meet up with a paved road leading a few yards to a junction at a saddle with great views to the south, including the Santa Ana Mountains, Catalina Island and downtown L.A., and Millard Canyon to the north.

This is the turnaround point (1.6 miles from the start), but you can easily extend the hike along the Sunset Ridge Trail or the Mt. Lowe Fire Road if you see fit. As an alternate to the loose, steep trail, you can also descend via Cheney Trail by heading left on the Mt. Lowe Fire Road and following it a short distance.

View of the San Gabriel Valley from the Altadena Crest Trail, California
0:29 – View from the Cheney Trail intersection

Text and photography copyright 2015 by David W. Lockeretz, all rights reserved. Information and opinions provided are kept current to the best of the author’s ability. All readers hike at their own risk, and should be aware of the possible dangers of hiking, walking and other outdoor activities. By reading this, you agree not to hold the author or publisher of the content on this web site responsible for any injuries or inconveniences that may result from hiking on this trail. Check the informational links provided for up to date trail condition information.

View of the San Gabriel Valley from the top of the Altadena Crest Trail, Angeles National Forest, CA
0:49 – Southeast view from the top

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