4.2
(8)
150
riders
18
rides
Gravel biking in Roy'S Redwoods Open Space Preserve offers diverse terrain across old-growth redwood groves, open meadows, and oak woodlands. The preserve features a network of multi-use trails, including fire roads and singletrack, suitable for various cycling levels. Rolling hills characterize much of the landscape, with some routes providing significant elevation changes and panoramic views across Marin County. The area's connectivity to adjacent open spaces extends the potential for varied gravel biking experiences.
Last updated: October 26, 2026
3
riders
15.9km
01:33
490m
500m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
5.0
(1)
4
riders
69.3km
06:24
1,680m
1,680m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.

5
riders
17.7km
01:30
390m
390m
Moderate gravel ride. Good fitness required. Mostly paved surfaces.
4.0
(2)
33
riders
56.4km
04:15
960m
960m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
21
riders
31.3km
02:35
620m
620m
Hard gravel ride. Very good fitness required. Mostly paved surfaces.
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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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Roy's Redwoods Open Space Preserve offers a network of over 15 gravel biking routes. These trails cater to various skill levels, ranging from easy to difficult, ensuring options for every rider.
The preserve features a range of difficulties. While there is 1 easy route and 3 moderate routes, the majority of the trails, about 11, are considered difficult. These challenging routes often include significant elevation gains and varied terrain, such as the Loma Alta Summit – 680 Trail loop from Marin County, which climbs over 490 meters.
You'll experience diverse landscapes, from majestic old-growth redwood groves to sunny grasslands and oak woodlands. Larsen Creek runs through the valley, supporting the redwoods. Keep an eye out for local wildlife like red-tailed hawks, deer, and various songbirds. The preserve also connects to areas like Roy's Redwoods Open Space Preserve and French Ranch Open Space Preserve, offering extended natural beauty.
Yes, for those seeking views, the Dickson Ridge Fire Road offers a challenging climb that rewards riders with expansive views across the rolling hills of Marin County and the valley below. You might even catch glimpses toward Mount Tamalpais on clear days.
Trail surfaces vary; while some are firm, many are unpaved, ideal for gravel biking. However, during rainy months, some trails, particularly parts of the Roy's Redwoods Loop Trail, can become very muddy due to horse traffic. Spring is vibrant with wildflowers in the meadows. It's advisable to check local conditions, as some trails may have seasonal closures for bicycles during wet conditions to prevent damage. Generally, drier seasons offer the best riding experience.
While many routes are challenging, the preserve does offer some easier sections. The Roy's Redwoods Loop Trail is generally considered easy to moderate and is a primary route, making it a good starting point for families. It winds through wooded areas and grasslands, offering a pleasant experience.
Absolutely. Roy's Redwoods Open Space Preserve is well-connected to adjacent areas like French Ranch Open Space and the former San Geronimo Valley Golf Course (now San Geronimo Commons). The Valley Trail, for instance, links Roy's Redwoods to French Ranch Open Space, allowing for longer and more varied rides, such as the Marie Dhority Bridge – Cross Marin Trail loop from Samuel P. Taylor State Park.
Yes, parking is generally available at designated access points for the preserve. It's always a good idea to check specific trailheads or park websites for the most current parking information and any potential fees or restrictions.
The area is highly rated by the komoot community, with an average score of 4.5 stars from over 4 reviews. Riders often praise the diverse terrain, from the tranquil redwood groves to the challenging fire roads, and the opportunity to explore varied landscapes. Many appreciate the less crowded experience compared to other redwood parks.
Yes, several loop options are available. The Roy's Redwoods Loop Trail is a popular choice, offering a roughly three-mile circuit through varied scenery. For a more challenging loop, consider the 680 Trail – Gestalt Haus loop from Fairfax, which climbs through hills and offers expansive views.
Roy's Redwoods Open Space Preserve is generally dog-friendly, but specific rules regarding leashes and trail access may apply. It's best to consult the Marin County Parks website for the most up-to-date regulations regarding dogs on trails within the preserve.
While the preserve itself is a natural area, the nearby town of San Geronimo and other surrounding communities offer options for cafes and restaurants where you can refuel after your ride.


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