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Routes
Mountain biking trails
United States
California
Los Angeles County
San Gabriel Mountains National Monument

Lower Monroe Truck Trail

Moderate

3.4

(13)

97

riders

Lower Monroe Truck Trail

02:38

22.3km

820m

Mountain biking

Experience a moderate 13.9-mile mountain bike ride on the Lower Monroe Truck Trail, known for its sustained climb and long descent.

Last updated: February 26, 2026

Tips

Includes a very steep uphill segment

You may need to push your bike.

After 4.19 km for 322 m

Waypoints

A

Start point

Get Directions

1

3.70 km

View of Glendora

Highlight • Viewpoint

At the junction of Lower Monroe Trail, Mystic Canyon Trail, and Lower Monroe Truck Trail is a great view over Glendora down in the south below.

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2

12.4 km

Lower Monroe Truck Trail

Highlight (Segment) • Trail

The Lower Monroe Truck Trail has a mix of terrain, starting with a flat, rocky doubletrack section that transitions into a gradual, twisty eight-mile climb up to Glendora Mountain Road. …

Tip by

B

22.3 km

End point

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Way Types & Surfaces

Way Types

16.2 km

4.01 km

2.15 km

Surfaces

16.2 km

3.09 km

2.15 km

920 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (1,040 m)

Lowest point (350 m)

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Weather

Powered by Foreca

Today

Wednesday 6 May

21°C

6°C

0 %

Additional weather tips

Max wind speed: 12.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

Where can I park and access the trailhead for this route?

The Lower Monroe Truck Trail typically starts near the bottom of the canyon in Glendora. Parking is usually available along the street near the trailhead. Many riders also opt for a shuttle service to the top of Glendora Mountain Road to focus solely on the extensive downhill ride.

How difficult is the Lower Monroe Truck Trail for mountain biking?

This route is generally rated as moderate for mountain biking. The climb, while long (about 6-8 miles), is steady rather than extremely steep, though it's physically demanding. The downhill section is fast-paced and can be compared to a 'crazy fun blue trail,' but it features rocky and rutted sections that require attentiveness.

What is the terrain like on this mountain bike route?

The trail begins with a roughly 1.7-mile 'rock garden creek' section that is bumpy and twisty, with both doubletrack and narrower singletrack. After this, it transitions to a steady, gradual 6.2-mile climb, mostly on doubletrack. The descent retraces this path, offering a fast ride that can be rocky and rutted, with loose rocks in the bottom section and characteristic Southern California dirt and sand elsewhere.

What kind of scenery and viewpoints can I expect?

Riders can enjoy amazing views of the San Gabriel Valley and south towards Orange County from a plateau about 3.3 miles into the climb. This spot, often called an 'appreciation station,' is a popular rest stop. The trail continues to offer great scenery as it ascends along the mountainsides. You'll pass by the View of Glendora highlight.

Is this trail dog-friendly?

Yes, dogs are generally allowed on the Lower Monroe Truck Trail. However, it's always best to keep them on a leash, especially in shared-use areas, and be mindful of other trail users, particularly mountain bikers on the downhill sections.

What is the best time of year to ride this trail?

Spring and fall offer the most pleasant riding conditions with milder temperatures. Due to limited tree cover, the trail can get very hot during summer months, making early morning rides essential if visiting then. Winter can also be a good time, but be aware of potential rain and cooler temperatures.

Are there any permits or fees required to ride here?

The Lower Monroe Truck Trail is located within the Angeles National Forest. While there are no specific permits required for riding the trail itself, a National Forest Adventure Pass may be required for parking in certain areas within the forest. It's advisable to check the latest regulations before your visit.

Does the trail intersect other well-known paths?

Yes, the route primarily follows the Lower Monroe Truck Trail, but sections of the route also pass through the Lower Monroe Trail and the Punk Out Trail.

What should I bring for a mountain bike ride on this trail?

Given the trail's exposure to the sun and length, it's crucial to bring plenty of water, especially during warmer months. Full-finger gloves are recommended to protect against thorny vegetation. Sunscreen, a helmet, and basic bike repair tools are also essential.

Is there a long descent on this route?

Yes, the Lower Monroe Truck Trail is renowned for providing one of the longest descents in Southern California. After a sustained climb, the return journey offers an extensive, fast-paced downhill experience.

Are there any specific hazards to be aware of on the trail?

The trail has limited tree cover, leading to significant sun exposure and heat, especially in summer. The downhill sections can be rocky and rutted, requiring careful attention. Also, the lower sections are shared with pedestrians, so caution is advised during descents.

Nearby routes

Hard

4.5

18

Glendora Mountain Road and Lower Monroe Truck Trail

03:36h

38.9km

1,190m

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