4.4
(6)
118
riders
19
rides
Gravel biking in Loma Alta Open Space Preserve offers diverse terrain across its extensive network of fire roads and trails. The preserve features open grasslands, dense California bay woods, and woodlands with white and coast live oaks, providing varied riding environments. As one of Marin County's higher peaks, Loma Alta offers panoramic views of the Bay Area. Canyons and creekbeds add topographical interest to the routes.
Last updated: May 30, 2026
2
riders
18.6km
01:43
500m
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
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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3.0
(1)
8
riders
38.6km
03:35
950m
940m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
9
riders
52.5km
05:00
1,510m
1,500m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
8
riders
40.6km
03:43
1,040m
1,040m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Loma Alta Open Space Preserve
An absolute must-see for cycling enthusiasts! This museum in Fairfax tells the story of nearly 200 years of cycling history, from 19th-century velocipedes to modern racing bikes. It's also home to the Mountain Bike Hall of Fame, featuring unique specimens and stories about the pioneers of mountain biking. The collection is impressive and authentic—no replicas, but real bicycles that showcase the evolution of technology and design. An inspiring place where you can truly feel the passion for cycling.
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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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At the junction of Chicken Shack Fire Road and Ponti Ridge Trail. There are benches, a great view, and trail markers.
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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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Good supporter of Marin Biking and nice lot to start your ride from and have a beer after
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Steep heading West can have traffic on SFD
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There are over 20 distinct no traffic gravel bike routes in Loma Alta Open Space Preserve, offering a variety of experiences for different skill levels. You'll find a mix of moderate and difficult trails to explore.
The gravel biking trails in Loma Alta Open Space Preserve range from moderate to difficult. While some routes require very good fitness and advanced riding skills, there are also options suitable for all skill levels with less elevation gain. For example, the Phoenix Lake – Fish Gulch trail junction loop from Fairfax is a moderate option, while the Fairfax – Gestalt Haus loop from Fairfax presents a more difficult challenge.
You can expect a diverse range of terrain, primarily consisting of well-suited fire roads. The preserve features open grasslands, dense California bay woods, and woodlands with white and coast live oaks. While the focus is on unpaved gravel paths, some routes may include short paved sections. Canyons and creekbeds add topographical interest, and for those seeking more technical riding, some areas offer wooded singletrack.
Absolutely! As one of Marin County's highest peaks, Loma Alta offers breathtaking panoramic views of the entire Bay Area, including Mount Tamalpais and the San Francisco Bay. You can also visit Fairfax Falls during the rainy season, a 25-foot cascading waterfall. The Old Railroad Grade Trail is another notable feature, providing expansive vistas.
Loma Alta Open Space Preserve is rich in natural beauty. You'll encounter diverse ecosystems, from open grasslands to oak woodlands. In spring, vibrant wildflowers like California poppies and lupines are abundant. The preserve also plays a crucial role in dividing four major watersheds, and you might spot various wildlife, including raptors hunting over the open slopes and different bird species in the grasslands and canyons.
The komoot community highly rates the trails in Loma Alta Open Space Preserve, with an average score of 4.25 stars. Reviewers often praise the stunning panoramic views, the extensive network of fire roads perfect for gravel biking, and the feeling of being immersed in nature away from traffic. The diverse landscapes and challenging climbs are also frequently highlighted.
Yes, while some routes are challenging, there are options suitable for all skill levels with less elevation gain, making them more accessible for families. It's always recommended to check the specific route details on komoot for distance and elevation to ensure it matches your family's capabilities. The extensive network allows for choosing less strenuous paths.
Spring is particularly delightful for gravel biking, as you can enjoy vibrant displays of wildflowers. The rainy season (typically winter) brings the surprising Fairfax Falls to life. However, the panoramic views are spectacular year-round, especially during sunrise and sunset. Be mindful of trail conditions, as some paths can be muddy after heavy rains.
Parking is generally available at various trailheads around the preserve. For example, the White Hill — Old Railroad Grade upper trailhead and White Hill Trailhead are common access points. It's advisable to check local signage for specific parking regulations and availability, especially on busy days.
Regulations regarding dogs can vary within open space preserves. While Loma Alta is a popular spot for outdoor activities, it's important to check the specific rules for each trail or area you plan to visit. Generally, dogs are often permitted on leash on fire roads, but restrictions may apply to certain singletracks or sensitive wildlife areas. Always follow posted signs and local guidelines.
Yes, Loma Alta Open Space Preserve connects to adjacent open spaces, allowing for longer, more extensive outdoor excursions and loop routes. For instance, the Alpine Dam – Alpine Lake loop from Sleepy Hollow offers a significant distance, and the Fairfax – Alpine Lake - Bon Tempe Dam loop from Fairfax is another excellent option for a longer ride.
Direct public transport access specifically for gravel bikers with bikes to the trailheads of Loma Alta Open Space Preserve can be limited. While some bus routes may serve nearby towns like Fairfax, reaching the preserve's entry points often requires a short ride or walk from the nearest stops. Planning your route in advance with public transport maps is recommended, or consider driving to a trailhead with parking.


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