4.0
(5)
120
riders
16
rides
Gravel biking in French Ranch Open Space Preserve offers diverse landscapes across 403 acres in Marin County, featuring multiuse fire roads suitable for cycling. The preserve is characterized by deep, forested canyons with redwood and oak groves, ascending to ridges that provide expansive valley overlooks. Riders will encounter varied terrain, including areas with unique serpentine soil and sections of the Lagunitas Creek watershed.
Last updated: August 20, 2026
3
riders
15.9km
01:33
490m
500m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.0
(2)
36
riders
65.9km
04:42
1,010m
1,010m
The Alpine Dam – Alpine Lake loop from Sleepy Hollow is a crown jewel among Marin County gravel biking routes, offering an incredible journey through varied landscapes. You'll wind through…

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5.0
(1)
4
riders
69.3km
06:24
1,680m
1,680m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5
riders
17.7km
01:30
390m
390m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
19
riders
31.3km
02:35
620m
620m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around French Ranch Open Space Preserve
Constructed in 1917 this dam forms Alpine Lake, which sites between Kent and Bon Tempe Lakes. The road across the top of the dam make it a great place to ride on a loop around the lake.
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This lake was formed by the building of Alpine Dam in 1917. It sits between Kent Lake and Bon Tempe Lake, and is popular for a variety of outdoor activities.
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West of Lake Lagunitas, Bon Tempe Lake is a reservoir managed by Marin Municipal Water District. It features striking scenery, with lush trees, clear water, and a peaceful atmosphere.
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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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Steep heading West can have traffic on SFD
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Loma Alta literally translates to "high hill" and is the highest point in the Loma Alta Open Space Preserve. A few different dirt roads and trails lead to the bald summit that looks over the surrounding hillsides.
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Embark on an adrenaline-fueled mountain biking adventure through Big Rock. The trail reaches its peak at the towering landmark, a colossal rock that adds a unique touch to the experience. Exercise caution on the descent; the pavement can get slippery, adding an exhilarating challenge to this thrilling ride.
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French Ranch Open Space Preserve offers a good selection of traffic-free gravel bike trails, with 11 routes currently available on komoot. These trails primarily utilize the preserve's multiuse fire roads, providing ample opportunities for gravel cyclists to explore the diverse landscapes.
The preserve is enjoyable year-round, but spring and fall offer ideal conditions with mild temperatures and vibrant scenery. During the rainy season, you might encounter more active wildlife like salamanders and snails, and spring brings an array of wildflowers. The forested canyons and redwood groves, especially around Roy's Redwoods, offer refreshing cool temperatures even during summer.
While many routes are rated moderate to difficult, the preserve's multiuse fire roads generally provide a stable surface. For a family-friendly experience, consider shorter sections of these fire roads. Always check the specific route details for elevation and distance to ensure it matches your family's ability. The area around Roy's Redwoods Open Space Preserve might offer gentler terrain suitable for a more relaxed ride.
You can expect a mix of terrains, predominantly multiuse fire roads which are ideal for gravel biking. These routes often ascend to ridges offering expansive valley views and pass through deep, forested canyons with Douglas fir, redwood, oak, and tanoak trees. Some areas, particularly the western end, feature unique serpentine soil, adding an interesting ecological dimension.
The preserve is rich in natural beauty. You can ride through majestic redwood groves, particularly near Roy's Redwoods Open Space Preserve, which is famous for being a Star Wars filming location. Ascend to Moon Hill Summit for panoramic views, or explore sections of the Roy's Redwoods Loop Trail. The preserve is also part of the Lagunitas Creek watershed, home to diverse wildlife.
Yes, many of the gravel bike routes in and around French Ranch Open Space Preserve are designed as loops. For example, the challenging Loma Alta Summit – 680 Trail loop from Marin County offers a circular experience with significant elevation gain. Another option is the Fairfax – Gestalt Haus loop from Fairfax.
The gravel bike trails in French Ranch Open Space Preserve range from moderate to difficult. Out of the 11 routes, 3 are rated moderate and 8 are rated difficult. Routes like the Phoenix Lake – Fish Gulch trail junction loop from Fairfax are considered moderate, while longer rides such as the Alpine Dam – Alpine Lake loop from Sleepy Hollow present a significant challenge with over 1000 meters of elevation gain.
While specific parking areas within the preserve are not detailed, access points often exist near the eastern start of gravel trails along Sir Francis Drake Blvd. It's advisable to check local regulations and designated parking areas in nearby towns like Woodacre or Fairfax, which serve as common starting points for rides into the preserve.
The area is highly rated by the komoot community, with an average score of 4.0 stars. Reviewers often praise the preserve's quiet, traffic-free fire roads, the stunning views from ridge overlooks, and the unique experience of riding through ancient redwood groves. The diverse terrain and challenging climbs are also frequently highlighted by experienced riders.
Yes, for those seeking a longer adventure, French Ranch Open Space Preserve and its surrounding areas offer extensive routes. The Alpine Dam – Alpine Lake loop from Sleepy Hollow is a challenging 65.8 km route, while the Fairfax – Alpine Lake - Bon Tempe Dam loop from Fairfax covers 38.5 km, both providing significant distances and elevation for experienced gravel bikers.
Public transport options directly to the trailheads within French Ranch Open Space Preserve may be limited. It is generally recommended to plan your trip by car to reach the main access points or starting towns like Woodacre or Fairfax, from where you can cycle into the preserve. Always check local transit schedules for the most up-to-date information.


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