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United States
California
Marin County
Lagunitas-Forest Knolls

San Geronimo Ridge and Kent Lake Loop

Hard

4.9

(3023)

18,208

runners

San Geronimo Ridge and Kent Lake Loop

02:27

17.6km

660m

Running

Difficult 11.0 miles (17.6 km) jogging loop through diverse terrain and scenic views of Kent Lake in the Mount Tamalpais Watershed.

Last updated: February 26, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Samuel P. Taylor State Park

Waypoints

A

Start point

Parking

Get Directions

1

3.72Β km

Caterpillar - Contour Trails

Highlight (Segment) β€’ Trail

2

11.0Β km

Green Hill overlook

Highlight β€’ Viewpoint

Sweeping views along the ridge trail, down into the valley filled by Kent Lake and beyond.

Tip by

3

12.9Β km

San Geronimo Ridge

Highlight (Segment) β€’ Viewpoint

From the high ridge sweeping views open up to both sides, most still densely forested and often covered in morning mist that helps this forest survive despite the long periods without rain.

Tip by

4

16.0Β km

Kent Lake

Highlight (Segment) β€’ Lake

Upper Peters Dam Road is a well shaded path that partially navigates along Kent Lake shore. On the way out you can see the large dam looming overhead.

Tip by

B

17.6Β km

End point

Parking

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Way Types & Surfaces

Way Types

9.66Β km

7.48Β km

273Β m

201Β m

Surfaces

9.57Β km

7.41Β km

273Β m

201Β m

169Β m

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Elevation

Elevation

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

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Weather

Powered by Foreca

Wednesday 8 July

22Β°C

9Β°C

0Β %

Additional weather tips

Max wind speed: 17.0Β km/h

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Frequently Asked Questions

Where can I park to access the San Geronimo Ridge and Kent Lake Loop?

While specific parking areas aren't detailed, trailheads for this loop are typically found within the Mount Tamalpais Watershed area. It's advisable to check the Marin County Parks website (marincounty.gov) for the most current information on designated parking lots and access points.

Are dogs allowed on the San Geronimo Ridge and Kent Lake Loop?

Yes, dogs are generally allowed on these trails. Typically, they should be on-leash on singletrack trails and can be under voice command on fire roads. Always be mindful of other trail users and local regulations.

What is the best time of year to jog this loop?

The trails are generally accessible year-round. However, conditions vary: summers can lead to 'buffed out and hard' trails, while wet winters can make them 'sloppy and muddy'. Spring offers the bonus of wildflowers at lower elevations.

Are there any permits or fees required for this trail or the Mount Tamalpais Watershed?

The Mount Tamalpais Watershed, where this trail is located, is managed by the Marin Municipal Water District. Generally, there are no specific permits or entrance fees required for day use of the trails. However, it's always a good idea to check the official Marin County Parks website (marincounty.gov) for any updated regulations or special permits that might be needed.

Is the San Geronimo Ridge and Kent Lake Loop suitable for beginners?

This loop is rated as 'difficult' for jogging on komoot, and research indicates it ranges from moderate to hard due to significant elevation changes. While some sections offer gentle ascents, others can be very steep. It might be challenging for absolute beginners, but those with some jogging experience and good fitness could manage it.

What is the terrain like on the San Geronimo Ridge and Kent Lake Loop?

You'll encounter a diverse mix of surfaces. Expect dirt and gravel fire roads, which can sometimes be 'nasty loose at parts with baby heads' (small rocks). There are also sections of light singletrack. Some fire roads are well-maintained, while other areas can be more rugged. Conditions can change with the seasons, becoming hard and buffed out in dry months or muddy when it rains.

How long does it typically take to complete the San Geronimo Ridge and Kent Lake Loop?

The komoot tour estimates a duration of approximately 2 hours and 27 minutes for jogging the 17.6 km (10.9 miles) loop. Keep in mind this is an estimate, and your actual time may vary based on your pace and stops.

What kind of scenery and viewpoints can I expect along the route?

The loop offers beautiful scenery, including sweeping views of Kent Lake and surrounding valleys. You'll pass through dense forests, lush redwood groves, and grassy meadows. Notable viewpoints include Green Hill overlook and sections of San Geronimo Ridge. The area is rich in diverse trees like redwood, madrone, Douglas-fir, oak, and bay.

How popular is this trail, and can I expect solitude?

This trail system is often described as less popular than other Marin trails, offering 'lighter traffic' and 'little to no people around'. If you're looking for a more secluded experience, this loop could be a great choice.

Are there any notable highlights or points of interest on the loop?

Yes, the route features several highlights. You'll traverse sections of the Caterpillar - Contour Trails, enjoy views from Green Hill overlook and San Geronimo Ridge, and experience the beauty of Kent Lake.

Does the loop connect with other trails in the area?

Yes, the route integrates with a broader network of trails. You'll find yourself on sections of the Bay Area Ridge Trail - 01 - North Bay, San Geronimo Ridge Road, Hunt Camp Trail, Manzanita Fire Road, Contour Trail, Caterpillar Trail, and Upper Peters Dam Road, among others.

What are the trail conditions like during different seasons?

During dry months, especially summer, the trails can become 'buffed out and hard'. In contrast, when it rains, particularly in winter, sections can become 'sloppy and muddy'. Always check recent conditions before heading out, especially after heavy rainfall.

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