El Prieto and Fern Truck Trail Loop
El Prieto and Fern Truck Trail Loop
4.5
(3046)
12,158
hikers
El Prieto and Fern Truck Trail Loop
03:42
12.3km
400m
Hiking
The El Prieto and Fern Truck Trail Loop offers a moderate hiking experience through varied landscapes, from shaded canyons to open hillsides. As you hike, you'll wind through an oak-lined canyon on the El Prieto side, encountering multiple stream crossings and old dams. The route then climbs, rewarding you with panoramic views that stretch across the cityscape, Pasadena, and the Los Angeles basin, making for a scenic journey over 7.7 miles (12.3 km) with 1324 feet (403 metres) of elevation gain, typically completed in about 3 hours and 41 minutes.
When planning your visit, you can find street parking in Altadena, often close to Loma Alta Park. The trailhead is commonly accessed near the JPL entrance or at the end of W Altadena Drive. Be aware that this trail is quite popular with both hikers and mountain bikers, so you should expect to share the path with others, especially on weekends. Starting early can help you avoid the busiest times.
This loop is a fantastic way to immerse yourself in the natural beauty of the Angeles National Forest, right on the edge of Altadena. Beyond the diverse terrain, you might also spot local wildflowers and various wildlife along the way, adding to the trail's appeal. It's a well-loved route for its accessibility and the rewarding views it provides, offering a true escape into nature without venturing too far from the city.
Last updated: April 23, 2026
Tips
Your route passes through a protected area
Please check local regulations for:
Waypoints
Start point
Parking
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5.39 km
El Prieto Trail
Highlight • Trail
Tip by
12.3 km
End point
Way Types & Surfaces
Way Types
8.14 km
4.04 km
135 m
Surfaces
8.53 km
2.22 km
729 m
516 m
212 m
120 m
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Elevation
Highest point (720 m)
Lowest point (340 m)
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Weather
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Today
Wednesday 15 July
34°C
21°C
0 %
Additional weather tips
Max wind speed: 11.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
Where can I park for the El Prieto and Fern Truck Trail Loop?
You can find street parking in Altadena, often near Loma Alta Park. The starting point is commonly near the JPL entrance or at the end of W Altadena Drive.
Do I need a permit or pay an entrance fee for this trail?
The El Prieto and Fern Truck Trail Loop is located within the Angeles National Forest. While there isn't a specific entrance fee for the trail itself, a Forest Adventure Pass may be required for parking in certain areas within the National Forest. It's always best to check the latest regulations before your visit.
Is the El Prieto and Fern Truck Trail Loop dog-friendly?
Yes, this trail is generally dog-friendly. Please ensure your dog is on a leash at all times and that you pack out any waste to help keep the trail clean for everyone.
What is the best time of year to hike this loop?
The trail can be enjoyed year-round, but spring and fall offer the most pleasant temperatures. Spring brings wildflowers, while fall showcases beautiful colors. Be mindful of potential heat in summer and cooler, possibly wet conditions in winter. The El Prieto side has multiple stream crossings, which can be more significant after heavy rains.
What is the terrain like on the trail?
The terrain is quite varied. It starts on a paved path, transitions to a dirt road, and then to singletrack. The El Prieto Trail section is known for being rocky and rooty, with 180-degree switchbacks and stream crossings in an oak-lined canyon. Fern Truck Trail is a wider, steadier climb, often with a 10% incline.
What kind of scenery and views can I expect on the trail?
You'll experience a mix of wooded areas, especially on the El Prieto Trail climb, and more open sections with commanding views. As you gain elevation, you'll be treated to panoramic sightlines overlooking the cityscape, Pasadena, and the Los Angeles basin. You might also see wildflowers, fall colors, and a river/creek.
Are there any notable landmarks or natural features along the way?
Yes, the El Prieto Trail section winds through an oak-lined canyon with multiple stream crossings. You can also spot interesting old dams along this part of the trail, which are remnants of historical water regulation efforts.
What's the recommended direction to hike the loop?
For hikers, it's generally recommended to ascend via the El Prieto Trail and descend via Fern Truck Trail. Hiking down El Prieto is considered less desirable due to its steep and technical nature, especially with rocks and some exposed areas.
Does the trail intersect other well-known paths?
Yes, the route also passes through sections of the Gabrielino Trail, Fern Truck Trail, and the El Prieto Trail.
How much shade does the trail offer?
The trail is described as being roughly half-shaded and half-exposed. The El Prieto Trail section, in particular, offers more shade as it winds through an oak-lined canyon.
Can I extend my hike beyond the main loop?
Yes, from the Brown Mountain Saddle, you have the option to extend your adventure. You can do an out-and-back towards the Ken Burton Trail for a longer hike.
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