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Gravel rides
United States
California
Marin County

King Mountain Open Space Preserve

The best gravel rides in King Mountain Open Space Preserve

4.6

(26)

574

riders

43

rides

Gravel biking in King Mountain Open Space Preserve offers diverse landscapes across its 193 acres, featuring shaded mixed woodlands, sunny grasslands, and redwood canyons. The terrain includes both gentle climbs and more strenuous sections, with multi-use trails and fire roads suitable for gravel bikes. Riders can experience varied natural environments and panoramic views of the San Francisco Bay and Mount Tamalpais from various points. The preserve's network of trails provides an engaging experience for gravel cyclists.

Best gravel bike trails…

Last updated: July 1, 2026

7

riders

#1.

Camino Alto Road – Pickleweed Inlet crossing loop from Larkspur

27.1km

01:59

580m

580m

The Camino Alto Road – Pickleweed Inlet crossing loop from Larkspur is a challenging gravel biking route that stitches together the best of Marin County's varied terrain. You'll navigate the…

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Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard
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Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard

Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

Hard
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Tips from the Community

serge πŸšΆπŸ‰πŸ˜ŠπŸ‡§πŸ‡ͺ
May 13, 2026, Battery Townsley

Batterij Townsley is a place where nature and history meet. As you climb along the rugged cliffs of the Marin Headlands, the old coastal defense slowly emerges from the landscape. Once at the top, a panorama opens up that will leave you speechless: the Pacific Ocean, the Golden Gate Bridge, and the endless horizon. The abandoned bunkers and tunnels give the place a mysterious atmosphere, as if time has stood still here. A perfect stop to enjoy, wander, and completely immerse yourself in the view.

Translated by Googleβ€’

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Eric Cross
August 10, 2025, Phoenix Lake

log cabin at phoenix lake

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Part of the coastal defenses along Coastal Trail, latest remnants here date from the WW II and early cold war era.

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At this point on Sky Oaks Road, there is a junction with Shaver Grade Road, which connects with a dense network of trails and dirt roads near Bald Hill in the Mount Tamalpais State Park. From here, you can continue on the paved Sky Oaks Road or go arond the gate on to the gravel Shaver Grade Road.

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Mount Tamalpais State Park is a majestic area in the heart of Marin County, with sweeping hillsides covered in fantastic redwood forest, open grasslands, sturdy chaparral, and wooded oaklands. The views from Mount Tampais boast breathtaking vistas of the Pacific Ocean, San Francisco Bay and City, the Marin County Hills, Mount Diablo, and the East Bay. You can even see the Farallon Islands, 25 miles out to sea. If you're lucky, you can catch an occasional glimpse of the snow-capped Sierra Nevada Mountain Range, nearly 150 miles away. The Park is a haven for cyclists, hikers, wildlife watchers, or those who wish to find a beautiful spot for an afternoon picnic.

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Sue
October 26, 2023, Bothin Marsh Preserve

This tidal sanctuary runs along the Mill Valley-Sausalito Pathway and the Charles F. McGlashan Pathway. More than 400 species of migratory birds rest here after their long flights, and if you pass through in the early morning or late evening, the sunrises and sunsets reflect beautifully on the surface of this 106-acre marsh.

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There is a great view of the northern point of Alpine lake where a small channel feeds over to Bon Tempe Lake. This is a great place to drop a line, or just enjoy the aquatic views.

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There are, indeed, horses on this hill. Connector path between Mill Valley and Corte Madera, easier than Camino alto. The alto tunnel is still closed, learn more here: https://openaltotunnel.org/

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Frequently Asked Questions

How many gravel bike trails are available in King Mountain Open Space Preserve?

King Mountain Open Space Preserve offers a wide selection of gravel biking routes, with over 50 trails recorded on komoot. These routes cater to various skill levels, from easy to difficult, ensuring there's something for every rider.

What kind of terrain can I expect on the gravel bike trails?

The preserve features diverse terrain, including multi-use trails and fire roads. You'll ride through shaded mixed woodlands, sunny grasslands, chaparral, and redwood canyons. Expect both gentle climbs and more strenuous sections, with some trails potentially muddy after rain.

Are there any scenic viewpoints or landmarks along the gravel bike routes?

Yes, King Mountain Open Space Preserve is known for its panoramic views. From various points, you can enjoy expansive vistas of the San Francisco Bay, the Richmond-San Rafael Bridge, and Mount Tamalpais. A notable viewpoint is the View from King Mountain. You might also encounter rustic benches at creek crossings for a tranquil break.

When is the best time of year to go gravel biking in King Mountain Open Space Preserve?

Spring is particularly beautiful, as the area comes alive with wildflowers like milkmaids, monkeyflower, and California poppies. After rainstorms, seasonal waterfalls, such as Dawn Falls, are at their most impressive. Be aware that trails can be muddy during the wet season, so checking current conditions is advisable.

Are there any challenging gravel bike routes for experienced riders?

Absolutely. For those seeking a challenge, routes like the Camino Alto summit viewpoint – Camino Alto Road loop from Larkspur offer significant elevation gain and difficult terrain. Another demanding option is the Lagunitas Trail loop from Corte Madera, which covers 38.0 km through diverse landscapes.

What are some easier or moderate gravel biking options?

For a moderate experience, consider the Phoenix Lake – Fish Gulch trail junction loop from Larkspur, which is 20.4 km long and offers varied terrain. Another moderate choice is the Phoenix Lake – Fish Gulch trail junction loop from San Anselmo, covering 16.8 km.

Is King Mountain Open Space Preserve suitable for family gravel biking?

While the preserve offers diverse trails, some sections can be strenuous. There is at least one easy route available, and many trails are multi-use fire roads. When planning a family ride, it's best to choose routes with gentler climbs and be mindful that hikers are also prevalent, especially on weekends.

What do other gravel bikers say about King Mountain Open Space Preserve?

The area is highly rated by the komoot community, with an average score of 4.6 stars from 16 reviews. Nearly 600 gravel bikers have used komoot to explore the preserve, often praising its varied terrain, expansive views, and the engaging experience it provides.

Are there any waterfalls in the preserve, and are they accessible by bike?

Yes, the preserve features seasonal waterfalls, most notably Dawn Falls, which are particularly impressive after rainstorms. While the trails leading to them are generally multi-use, some sections might be more suitable for hiking or require dismounting, especially close to the falls themselves.

Where can I park when visiting King Mountain Open Space Preserve for gravel biking?

The region research mentions a 'gravel road' at the trailhead for parking, indicating designated areas are available. Specific parking locations can vary depending on your chosen starting point, so it's recommended to check the details for individual routes on komoot.

Are there any long-distance gravel routes in the preserve?

Yes, for longer rides, the Lagunitas Trail loop from Corte Madera is a substantial option at 38.0 km. Another challenging route, the Railroad Grade Fire Road loop from Mill Valley, covers 24.5 km with significant elevation gain.

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