Best trails in Altadena, California

11,021 Reviews
Looking for a great trail near Altadena, California? AllTrails has 41 great hiking trails, trail running trails, mountain biking trails and more, with hand-curated trail maps and driving directions as well as detailed reviews and photos from hikers, campers, and nature lovers like you. If you're looking for the best trails around Topanga State Park or Chino Hills State Park, we've got you covered. You'll also find some great local park options, like Eaton Canyon Natural Area Park or Runyon Canyon Park. Ready for some activity? There are 22 moderate trails in Altadena ranging from 1.9 to 19.1 miles and from 1,161 to 6,158 feet above sea level. Start checking them out and you'll be out on the trail in no time!
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Map of trails in Altadena, California
Top trails (41)
#1 - Echo Mountain via Sam Merrill Trail
Angeles National Forest
moderateYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray Star(3836)
Length: 5.4 mi • Est. 3 h 8 m
This trail is good for running but can be crowded. This route is the Lower San Merrill trail towards Lake. At the beginning, take the second trail further back towards mountain. At the top, turn right for Echo Mtn. Alternatively, turn left for Sierra Saddle (turn left again once you hit the paved road and the sign for Sierra Saddle should be on the right; you can take the paved road back up to backtrack to Echo Mtn after you reach the tables—adds on 4 miles). Show more
#2 - Dawn Mine and Sunset Trail Loop
Angeles National Forest
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Length: 6.0 mi • Est. 3 h 31 m
When the road leading up to the trail is closed, there is an extra mile walk to the trailhead.Show more
#3 - Millard Canyon Falls Trail
Angeles National Forest
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Length: 2.5 mi • Est. 1 h 1 m
In addition, the gates heading up and leading to the parking lot are closed on holidays and weekends so there may be an additional major uphill trek along the road to get to the trailhead. This trail is scenic and features waterfalls. It is shared with mountain bikers so there will be traffic going in both directions. You may encounter rattlesnakes on this trail. Show more
#4 - Inspiration Point Loop
Angeles National Forest
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Length: 10.0 mi • Est. 5 h 29 m
#5 - Inspiration Point via Sam Merril Trail to Castle Canyon Trail
Angeles National Forest
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Length: 9.4 mi • Est. 5 h 41 m
#6 - Dawn Mine
Angeles National Forest
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Length: 3.8 mi • Est. 2 h 11 m
The trail itself is beautiful. There is plenty of shade and a tree covered stream, which users report as very peaceful. Parts of the hike require users to cross the stream a few times and climb rocks, so it is recommended to bring proper footwear and to be ready for high water at times of heavy rain. The namesake Dawn Mine is tucked into the mountain next to an old steel water pump. The gate may be closed on weekends, which adds approximately 1.2 miles roundtrip from the lower parking area. If coming from Fire Road from Loma Alta Drive, users will come to a split with two signs. In this case, users recommend taking the left path.Show more
#7 - Mount Lowe Railway Loop
Angeles National Forest
hardYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray Star(245)
Length: 9.8 mi • Est. 5 h 49 m
Fascinating historic railway, great views, pine trees, deep canyons. This is a hike along the ruins of the Mt Lowe railway, Echo Mountain, and the Alpine Tavern. These locations were the most popular in Southern California in the late 1800's, before being destroyed by floods and fire. More than a dozen historical markers along the way tell the fascinating story of this railway. To top it off, the hike includes stunning views, pine forests, deep canyons, and lots of hiking. The first half of the hike, up to Alpine Tavern (now Mt Lowe Camp) and Inspiration Point, follows the Sunset Ridge Fire road to the top. The return leg is a bit more convoluted, but quite fun. A quarter mile down hill from Inspiration point, take the Sam Merrill Trail to Echo Mountain and visit the ruins of the former Inn at this location. Next head right on Echo Mountain Trail back to the Sunset Ridge Fire road. A hundred yards down the fire road on the right, take the unmarked trailhead for Sunset Ridge Trail, which parallels the fire road, and will get you home.Show more
#8 - Brown Mountain/El Prieto Trail
Hahamongna Watershed Park
moderateYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray Star(332)
Length: 7.3 mi • Est. 3 h 50 m
This is a very popular mountain biking trail, so take caution if you are a hiker. It is important for all users to share the trail with others and help make your whereabouts known with bells, or using your voice.Show more
#9 - Sunset Ridge Saddle Loop
Angeles National Forest
moderateYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarYellow StarGray Star(286)
Length: 4.4 mi • Est. 2 h 41 m
There are signs at the entrance gate indicating that it closes on weekends but users have reported that this is not always the case. The first 2.5 miles of the route are very uphill - on a fire road. The trail back is fantastic but not great if you’re afraid of heights.Show more
#10 - Mount Disappointment and San Gabriel Peak
Angeles National Forest
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Length: 4.4 mi • Est. 2 h 50 m
It is easy to miss the actual trailhead for this trail. The trailhead is right before the small parking area. If you pass the gate on the paved fire road, you've gone too far. Both trails lead to the peaks.Show more
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