The best walks and hikes around Altadena
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2,988
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Hiking around Altadena is characterized by routes that ascend into the foothills of the San Gabriel Mountains. The area's geography provides a network of trails through rugged canyon terrain and chaparral-covered hillsides within the Angeles National Forest. Many of these popular hiking trails in Altadena California follow historic paths, offering views across the Los Angeles Basin.
Best hiking trails around Altadena
- The most popular hiking route is Echo Mountain via Sam Merrill Trail — Angeles National Forest, a 6.6 mile (10.7 km) trail that takes about 3 hours 35 minutes to complete. The route leads to the historic ruins of the Mount Lowe Railway and Echo Mountain resort.
- Another top favourite among local hiking enthusiasts is Eaton Canyon Trail — Eaton Canyon Park, an easy 2.5 mile (4.0 km) path. This route follows a seasonal stream through the Eaton Canyon Natural Area to a waterfall.
- Local hiking enthusiasts also love the Mount Lowe Railway Ruins loop — Angeles National Forest, a 5.4 mile (8.7 km) trail leading through the San Gabriel Mountains, often completed in about 3 hours 25 minutes.
- Hiking around Altadena is defined by canyon trails, chaparral-covered hills, and routes exploring the San Gabriel Mountains. The trail network includes options for different ability levels, from easy walks in nature preserves to more strenuous hikes to viewpoints.
- The routes in Altadena are highly rated by the komoot community with an average score of 4.7 stars from more than 70 reviews. More than 1,400 hikers have used komoot to explore Altadena's varied terrain.
Last updated: April 26, 2026
5.0
(6)
18
hikers
11.8km
04:12
830m
430m
The Inspiration Point via Sam Merrill and Castle Canyon Loop offers a rewarding hiking experience, covering 7.3 miles (11.8 km) with a substantial 2723 feet (830 metres) of elevation gain. This moderate route, typically completed in about 4 hours and 11 minutes, leads you through varied terrain to stunning vistas. You will find yourself at Inspiration Point, where panoramic views of the Los Angeles Basin, including Altadena, Pasadena, and Glendale, unfold before you, with Catalina Island visible on clear days.
When planning your visit, remember that this trail is quite popular, especially on weekends, so an early start is advisable to secure parking at the trailhead. The Sam Merrill Trail section is largely exposed, offering minimal shade, which makes an early morning hike preferable to avoid the midday heat. Be sure to bring sturdy footwear, plenty of water, and snacks to stay comfortable and energized throughout this demanding journey.
Beyond the scenic beauty, this loop also provides a glimpse into the region's past. As you hike, you will encounter historical sites such as the ruins of the Mt. Lowe Observatory and remnants of the old Mount Lowe Railway. These historical elements add a unique layer to your outdoor adventure, connecting you with the rich heritage of the Angeles National Forest.
7
hikers
4.29km
01:33
400m
30m
Hike the moderate 2.7-mile Henninger Flats Trail in Angeles National Forest for panoramic views of Los Angeles and a unique forestry nursery
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7
hikers
9.87km
03:25
730m
200m
Hike the Mount Wilson Toll Road and Idlehour Trail to Idlehour Campground, a 6.1-mile route with 2383 feet of elevation gain.
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hikers
14.9km
05:13
1,210m
240m
The Idlehour Trail via Mount Wilson Toll Road is a difficult 9.2-mile hike in Angeles National Forest with 3954 feet of elevation gain.
13.5km
04:52
1,240m
110m
Embark on a challenging hike up the Mueller Tunnel via Loma Alta Trailhead, a difficult route covering 8.4 miles (13.5 km) with a significant elevation gain of 4069 feet (1240 metres). As you ascend, you will pass through oak woodlands and chaparral, offering expansive views of the Los Angeles Basin and the San Gabriel Mountains. This demanding adventure typically takes around 4 hours and 52 minutes to complete, rewarding you with panoramic vistas.
Before you go, be aware that an Adventure Pass might be necessary for parking at trailheads within the Angeles National Forest. Always carry plenty of water, especially on warmer days, as this is a strenuous climb. The trail is accessible from Loma Alta Drive, and you should plan your start time to allow ample daylight for your return.
One of the unique features of this route is the historic Mueller Tunnel, a hundred-yard passage carved directly through the mountain. This tunnel has been closed to motor vehicles since a 2009 landslide, making it an exclusive experience for hikers and cyclists. It stands as a testament to the area's history and offers a distinct landmark within the rugged landscape.
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Other adventures around Altadena
Tips from the Community
Upper terminus of Mount Lowe "Motorway" trail, a gravel double track that starts at about 600 m elevation from Chaney Trail in Altadena and ends here at Mount Wilson Red Box Road at about 1550 m above sea level.
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Short tunnel on the eastern slope below San Gabriel Peak, part of the old Mt Lowe Motorway, that was never paved. The tunnel is very short, so you don't have to worry about bringing light. The road continues to the trailhead half a mile uphill.
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Henninger Flats sits along the road with views of Altadena. You’ll pass by it while climbing the Mt. Wilson Toll Road and can take a moment to catch your breath while enjoying the views. The route features a steady climb with minimal shade, so it’s best to start early, especially in summer. At the top, enjoy panoramic views of the San Gabriel Valley and explore the area, which includes a visitor center, picnic spots, and a tree nursery.
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A series of disasters has eroded the properties in this area. In 1900, a kitchen fire destroyed the main house, and in 1905, another fire consumed the remaining structures. From 1909 to 1938, a combination of flooding, wind storms, and additional fires destroyed the rest. Here, you can now observe the ruins of the observatory and enjoy the beautiful view from this point.
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Gravel track on former railway from Eaton Canyon to Mt Wilson
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A site with spectacular views over Los Angeles County. Additionally, beneath the pavilion, you'll find various sighting tubes, each pointing to a different location, such as Redondo Beach, Catalina Island, Hollywood, etc.
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Eaton Canyon Trail crosses over the creek which is flowing out from the waterfall at the end of the trail. Depending on flow, there isn't rushing water, but enough for your leashed dog to cool off in!
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Inspiration Point is a view point that gives you a great view of Los Angeles County. There is a covered area that is available to enjoy the view!
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Frequently Asked Questions
Are the hiking trails in Altadena dog-friendly?
Many trails in the Altadena area, particularly within the Angeles National Forest, are dog-friendly, but dogs must be kept on a leash. However, specific areas like the Eaton Canyon Natural Area have stricter rules and may not permit dogs on all trails, especially the path to the waterfall, to protect wildlife. Always check the regulations for the specific trail you plan to hike.
Where can I find hikes with waterfalls near Altadena?
Altadena is home to several popular waterfall hikes. The most well-known is Eaton Canyon Falls, which is reached via the relatively easy Eaton Canyon Trail. Another beautiful cascade is Millard Canyon Falls, a 50-foot waterfall accessible via a short, family-friendly trail. Keep in mind that the flow of these waterfalls is seasonal and best viewed after recent rainfall.
Are there any easy, family-friendly hikes in the area?
Yes, Hahamongna Watershed Park is an excellent choice for families, offering flat and easy walking paths suitable for all ages. The trails around the Millard Falls Trailhead are also generally considered easy and rewarding for a shorter family outing.
What are some challenging hikes for experienced trekkers?
For a more strenuous challenge, the Muir Peak to Inspiration Point loop offers significant elevation gain and rewards hikers with exceptional panoramic views. These difficult routes require good fitness and preparation.
Can I hike to historical sites in Altadena?
Absolutely. Many trails follow the path of the historic Mount Lowe Railway. The hike to Echo Mountain leads you to the ruins of the 'White City' resort from the late 19th century, with interpretive signs explaining the history along the way.
What should I know about parking for popular trailheads?
Parking can be challenging, especially on weekends at popular trailheads like Eaton Canyon and the Sam Merrill Trail at Cobb Estate. Arrive early to secure a spot. Some trailheads in the Angeles National Forest may require a displayed Adventure Pass for parking, so it's wise to check requirements beforehand.
Do I need a pass to hike in the Angeles National Forest?
Yes, for parking at many trailheads and recreation sites within the Angeles National Forest, you will need a National Forest Adventure Pass. These can be purchased online or from local vendors. It's best to check the specific requirements for your planned trailhead before you go.
Which trails offer the best panoramic views?
Many trails provide stunning vistas. The hike to Echo Mountain offers expansive views over the Los Angeles Basin. For even more dramatic scenery, the trek to Inspiration Point is renowned for its breathtaking panoramic views that can stretch to the Pacific Ocean on a clear day.
Are there any good loop hikes available?
Yes, the Mount Lowe Railway Ruins loop is a fantastic option. This circular trail takes you through the historic area, offering varied scenery and a comprehensive exploration of the old railway's path without having to backtrack.
What's the best time of year to hike in Altadena?
Spring is a wonderful time to hike, as the hills are green and wildflowers are in bloom. Fall and winter offer cooler, more pleasant temperatures for hiking. Summers can be very hot, especially on exposed trails with little shade, so if you hike then, it's crucial to start early and bring plenty of water.
How many hiking trails are there around Altadena?
There are over 20 designated hiking routes to explore around Altadena. These range from easy nature walks to difficult mountain treks, offering a wide variety of options for every skill level.
What do other hikers enjoy most about the trails in Altadena?
The area is highly rated by the komoot community, with an average score of 4.7 stars. Reviewers often praise the combination of natural beauty and local history, highlighting the stunning views from the San Gabriel Mountains and the fascinating ruins of the Mount Lowe Railway.
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