4.2
(8)
150
riders
18
rides
Gravel biking in Roy'S Redwoods Open Space Preserve offers routes through a diverse landscape characterized by old-growth redwood groves, open grasslands, and woodlands of oaks and Douglas fir. While the preserve itself is primarily for hiking, adjacent areas and broader valley networks provide suitable terrain for no traffic gravel bike trails. Riders can expect rolling hills and varied ecosystems, with some routes featuring significant elevation changes.
Last updated: October 13, 2026
3
riders
15.9km
01:33
490m
500m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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.
4.0
(2)
33
riders
56.4km
04:15
960m
960m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
21
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 Roy'S Redwoods 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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Komoot features over 10 no-traffic gravel bike routes in and around Roy's Redwoods Open Space Preserve. These routes range from moderate to difficult, offering diverse experiences for gravel cyclists.
The terrain around Roy's Redwoods Open Space Preserve varies. While the preserve itself is known for its redwood groves and hiking trails, adjacent areas offer gravel biking opportunities on fire roads, converted golf cart paths, and unpaved segments. You can expect a mix of open grasslands, woodlands, and some challenging climbs, particularly on routes like the Loma Alta Summit – 680 Trail loop.
While many routes in the immediate vicinity are rated moderate to difficult, the broader San Geronimo Valley offers some gentler options. Look for routes that incorporate converted paved golf cart paths or less technical fire roads. Always check the route details on komoot for elevation and surface type to ensure it suits your family's skill level.
Dog policies can vary between different open space preserves and trail networks in Marin County. While Roy's Redwoods Open Space Preserve generally allows dogs on leash, it's crucial to verify specific regulations for each trail you plan to ride, especially when combining routes across different areas. Always ensure your dog is under control and respect wildlife.
Beyond the stunning old-growth redwood groves, you might encounter diverse landscapes including open grasslands and woodlands of oaks and firs. Higher points, such as those accessed via the Dickson Ridge Fire Road, offer sweeping views of the rolling hills. You can also explore highlights like Roy's Redwoods Open Space Preserve and French Ranch Open Space Preserve or the Moon Hill Summit.
Yes, many of the gravel bike routes in the area are designed as loops, allowing you to start and end at the same point. For example, the Fairfax – Gestalt Haus loop from Fairfax offers a challenging circular ride through varied terrain.
Spring is particularly beautiful with wildflowers blooming, including white and purple irises. Fall offers pleasant temperatures and changing foliage. During wet months, some trails, especially those shared with equestrians, can become muddy. Summer can be warm, so early morning rides are often preferred. Always check local weather conditions before heading out.
The area is highly rated by the komoot community, with an average score of 4.0 stars. Reviewers often praise the serene redwood groves, the challenging climbs that reward with panoramic views, and the feeling of escaping traffic on the dedicated unpaved sections. The connection to broader trail networks also allows for extended adventures.
Yes, while many routes are rated difficult, there are moderate options available. The Phoenix Lake – Fish Gulch trail junction loop from Fairfax is a good example of a moderate gravel route, offering a substantial ride without the most extreme climbs.
Parking is typically available at designated trailheads or nearby public parking areas. Given the preserve's popularity for hiking, parking lots can fill up, especially on weekends. It's advisable to arrive early or consider starting your ride from nearby towns like Fairfax, which may offer more parking options and direct access to connecting routes.
Absolutely. For experienced riders seeking a significant challenge, routes like the Alpine Dam – Alpine Lake loop from Sleepy Hollow offer over 65 km of riding with substantial elevation gain, traversing diverse landscapes and providing a full day's adventure.
Roy's Redwoods Open Space Preserve is home to various wildlife. Keep an eye out for hawks, woodpeckers, deer, and coyotes. In springtime, you might even spot California giant salamanders near Larsen Creek. Remember to observe wildlife from a distance and avoid disturbing their natural habitat.


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