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Lower Monroe Truck Trail

 4.2 (52)

16.1 Miles 25.9 Kilometers



2,319' 707 m


-2,319' -707 m



Avg Grade (3°)


Max Grade (8°)

3,435' 1,047 m


1,201' 366 m


Shared By Aviv Bar


All Clear 21 days ago
Dry History

Getting forecast...

A great doubletrack to the top of Glendora Mountain Road and a screaming downhill.

Aviv Bar

Dogs Unknown

Features -none-


The Lower Monroe Truck Trail combines a flat doubletrack rock garden with a steady but gradual eight-mile twisty climb to the top of Glendora Mountain Road. The reward comes in the form of a scenic eight-mile descent back to the start point.

Need to Know

A large parking area is available along Glendora Mountain Road approximately 1/2 mile south of the trailhead and in smaller patches leading into the trailhead.


The ride begins through a fairly flat rock garden creek, a bumpy and twisty 1.7-mile section with intermittent tree cover, but nothing extremely technical. The trail is mostly doubletrack, but narrows to singletrack in various spots along the rock garden.

At the end of the rock garden, the doubletrack takes a sharp right turn to begin a 6.2-mile climb. The climb is not extremely difficult, but it is steady with a very small number of flat areas and short descents along the way. A majority of the ride does not contain any tree cover.

At 3.3 miles, there is a plateau with amazing views of the San Gabriel Valley and south towards Orange County. This is a popular rest point before the climb gets a bit steeper.

From the rest point, the trail continues to climb as it winds along various sides of the mountains, providing great scenery. The trail ends at a turn-around point with a gate that leads to a dirt parking lot, adjacent to Glendora Mountain Road. If you want to skip the climb workout, you can shuttle to this parking lot and downhill the trail all day long.

Making a 180° turn at the gate will send you right back down the way you came up, but at a MUCH faster pace. The ride down Lower Monroe Truck Trail can be compared to a downhill park without the crazy jumps and super sharp turns. It is a fast-paced. twisty ride, negotiating a trail that is rocky and rutted in many places with trail-hugging vegetation.

The downhill seems to last forever and is guaranteed to put a constant smile on your face. On the lower area of the descent, you may encounter a few pedestrians, so a cowbell will serve your downhill well.

Also full-finger length gloves are highly recommended during dry summer months, to protect yourself against those handlebar-level thorny plants. Since you'll be exposed to the sun for the majority of the trail, a good supply of water is also recommended.


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Your Check-Ins


Sep 27, 2018
Jake Yi
6.8mi — 1h 10m
Sep 8, 2018
Christopher Hudson
Overgrown and sun exposure throughout. Lots of fun
Aug 10, 2018
Trianglist BJJ
Jun 30, 2018
Joseph Nassar
Jun 19, 2018
Matt Hawk
I want to warn MTBers to watch for hikers and their dogs. they like to keep them off leash and I just happened upon one on the decent on a blind co… 17.5mi
Jun 6, 2018
Vien To
May 6, 2018
Andy so
Apr 14, 2018
Cesar Lugo

Trail Ratings

  4.2 from 52 votes


  4.2 from 52 votes
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in California


344 Views Last Month
18,559 Since May 29, 2014
Intermediate Intermediate


this is singletrack, all the way. May 20, 2015
Michael Milne
Greenville, SC
Michael Milne   Greenville, SC
great trail, rode it today. the climb isnt that bad due to being so gradual and not technical at all. the dh is sweet! Dec 23, 2015
A gem in the western Inland Empire! What appears to be an abandoned truck trail overgrown into a combination of single/double tracks. 7.5 miles of continuous climb to a large dirt lot next to the famous paved Glendora Mountain Road; out n back for a total of about 15 miles. First mile is a slightly technical rock garden. Jan 5, 2016

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