4.6
(22)
487
riders
19
rides
Gravel biking in Camino Alto Open Space Preserve offers a network of no traffic gravel bike trails through 170 acres of diverse terrain. The preserve features fire roads and multi-use paths winding through oak and wildflower forests, redwood groves, and grasslands. Riders can experience varied landscapes, from nearly flat sections to moderately steep climbs, with panoramic views of the Bay Area and Mount Tamalpais.
Last updated: July 10, 2026
4.8
(6)
73
riders
47.4km
04:21
1,270m
1,270m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
15
riders
45.7km
03:59
1,180m
1,180m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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10
riders
51.6km
04:12
1,200m
1,200m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
9
riders
20.2km
01:32
460m
460m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(2)
28
riders
45.1km
03:18
770m
770m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Camino Alto Open Space Preserve
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.
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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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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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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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From easiest to hardest climbs out of phoenix lake from this junction: -Shaver Grade, easy grade, longer, shaded and pretty -Eldridge Grade, medium, good length and can connect you to mt tam east peak -Fish Grade fire road, very steep, we hiked the bikes
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Camino Alto Open Space Preserve offers a wide selection of routes, with over 20 no-traffic gravel bike trails available for exploration. These trails provide a great way to experience the preserve's natural beauty without vehicle interference.
The preserve is renowned for its diverse network of fire roads and multi-use paths, perfect for gravel biking. Riders can enjoy stunning panoramic views of the entire Bay Area, including San Francisco, the Bay Bridge, and Mount Tamalpais, all while traversing through varied ecosystems like oak groves, redwood forests, and wildflower-filled areas.
Prepare for breathtaking vistas! Many trails offer expansive views of the San Francisco Bay, the Bay Bridge, and even Mount Diablo in the distance. You'll also get fantastic perspectives of Mount Tamalpais and the foothills leading to Muir Woods, making for a truly scenic ride.
Yes, many of the gravel bike trails in Camino Alto Open Space Preserve are designed as loops, allowing you to start and end your ride at the same point. For example, consider the challenging Lagunitas Trail loop from Corte Madera or the scenic Fern Creek and spring β Pantoll Road loop from Mill Valley.
The terrain primarily consists of wide fire roads and multi-use paths. While generally less technical than singletrack, some routes feature moderately steep climbs and descents. You'll ride through diverse landscapes, from open grasslands to shaded oak and redwood forests.
While many routes offer challenging climbs, Camino Alto Open Space Preserve also features accessible routes with mostly paved surfaces suitable for various skill levels. These less technical fire roads can be a good starting point for families looking for a quieter gravel biking experience. Always check the route details for elevation and distance to ensure it matches your family's abilities.
Along your ride, you can explore various points of interest. The Camino Alto Road itself offers scenic sections, and you might pass by the Middle Summit / Escalon Fire Road π»π΅, which is a prominent trail. The preserve's diverse flora, including redwoods, Douglas firs, and seasonal wildflowers, also provides natural beauty to admire.
Camino Alto Open Space Preserve features multi-use paths that are generally dog-friendly. However, it's always best to check specific trail regulations and ensure your dog is on a leash, especially given the preserve's focus on protecting sensitive wildlife. You might even spot horses grazing on nearby Horse Hill.
The preserve offers enjoyable gravel biking year-round. Spring brings vibrant wildflowers, while fall provides cooler temperatures and beautiful foliage. Summer can be warm, but the shaded sections through oak and redwood forests offer relief. Winter rides are often pleasant, though some areas may experience seasonal night closures for wildlife protection.
The area is highly rated by the komoot community, with an average score of 4.5 stars. Reviewers often praise the stunning panoramic views, the sense of escape despite proximity to urban areas, and the well-maintained fire roads that provide an excellent no-traffic gravel biking experience through diverse natural settings.
Yes, for experienced riders seeking a challenge, routes like the Phoenix Lake β Fish Gulch trail junction loop from Mill Valley offer significant elevation gains and longer distances. These routes provide a rigorous workout while still allowing you to enjoy the preserve's quiet, traffic-free environment.
Trailheads are accessible from various points around the preserve. A notable access point is the Camino Alto OSP - Fire Road Trailhead. Parking is typically available near these access points, but it's advisable to check local signage for specific parking regulations and availability, especially during peak times.


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