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Big Rock Ridge β 680 Trail loop from Novato Hamilton
42.0km
04:42
1,500m
1,500m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
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By Fede from komoot
Β·
Updated May 28, 2026
If you've ever tried to plan mountain biking around Lucas Valley-Marinwood, you know how overwhelming the options can be. With so many trails, it's tough to tell which routes are genuinely worth your time and effort, and which are just filler. That's where we come in. Our komoot community has mapped, ridden, and reviewed countless miles here, so we've curated a shortlist of the best mountain bike routes in Marinwood that truly deliver. Consider this your shortcut to the top mountain bike trails Lucas Valley has to offer.
Mountain biking here is all about embracing the classic Northern California landscape: rolling hills, expansive oak woodlands, and a mix of flowing singletrack and wider fire roads. It's a region that rewards exploration, with routes ranging from moderate loops perfect for a scenic spin to challenging climbs that lead to rewarding vistas from Big Rock Ridge, the second-highest point in Marin County. You'll find a diverse network that caters to various skill levels, all within a beautiful, preserved natural setting.
For a fantastic introduction to the area, we'd start with the Mountainbike loop from Novato Hamilton, a popular moderate ride covering 10.3 miles (16.5 km) through those signature rolling hills and oak woodlands. If you're looking for a bigger challenge and the most payoff for your legs, the Big Rock Ridge β 680 Trail loop from Novato Hamilton is a difficult 26.9 miles (43.3 km) route that takes you right through Big Rock Ridge, offering significant elevation gain and incredible views. With over 2,400 mountain bikers having explored Lucas Valley-Marinwood with komoot, you can trust our community's insights to find your next adventure.
Trail | Distance | Elevation | Difficulty |
|---|---|---|---|
| Big Rock Ridge β 680 Trail loop from Novato Hamilton | 42.0Β km | 1,500Β m | Hard |
| Mountainbike loop from Novato Hamilton | 16.7Β km | 380Β m | Moderate |
| Mountainbike loop from Marinwood | 14.1Β km | 370Β m | Moderate |
| Mountainbike loop from Loma Verde | 10.9Β km | 370Β m | Moderate |
| Goat Trail loop from Marinwood | 11.8Β km | 450Β m | Moderate |
| 680 Trail β Loma Alta Summit loop from Northgate Mall | 19.6Β km | 620Β m | Moderate |
| Big Cat Trail loop from Loma Verde | 18.3Β km | 640Β m | Moderate |
| 680 Trail β 680 Trail loop from Marinwood | 18.2Β km | 510Β m | Hard |
| Big Rock Ridge β Goat Trail loop from Loma Verde | 21.2Β km | 780Β m | Moderate |
| Loma Alta Summit β 680 Trail loop from Las Gallinas | 27.3Β km | 620Β m | Moderate |
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42.0km
04:42
1,500m
1,500m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
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16.7km
01:34
380m
380m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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14.1km
01:25
370m
370m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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10.9km
01:15
370m
370m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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11.8km
01:26
450m
450m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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19.6km
02:06
620m
620m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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18.3km
01:58
640m
640m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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18.2km
01:47
510m
510m
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
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21.2km
02:30
780m
780m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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27.3km
02:22
620m
620m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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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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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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Big Rock Ridge, a striking ridge near Novato, California, standing as Marin County's second-tallest peak. Spanning 5 miles from northwest to east, it creates a natural boundary for central and southern Marin County. Named after the rock at the base of Big Rock Trail, this ridge promises awe-inspiring views and invigorating trails.
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Big Rock Trail cuts through Lucas Valley Open Space to reach the 2nd highest point in Marin County. From later winter through early summer the hills are verdant green and often covered in wildflowers. Bring plenty of water and a wide brimmed hat if it's a warm day as there is little shade, but this means the views are wide open and beautiful.
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Highest point on Big Rock Ridge Fire Road with panoramic views of the Bay, Marin county, and even across the East bay to Mt. Diablo and south to San Francisco. A short spur trail here leads to a point with slightly better views down over Skywalker Ranch and the Lucas Valley.
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Be careful on the descent, the pavement can get slippery. This is a great trail access spot for MTB and hiking.
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Lucas Valley-Marinwood offers a wide selection of mountain bike trails, with over 90 routes available. These range from easy to difficult, ensuring options for various skill levels.
The region is generally pleasant for mountain biking throughout much of the year. Spring brings vibrant wildflowers, while clear days offer spectacular views from high points like Big Rock Ridge. Always check local conditions, especially after rain, as some trails may be affected.
Yes, there are several options suitable for families. The area features 13 easy-rated routes, which are often less challenging and can be a good starting point for family outings. While specific family-designated trails aren't listed, routes with less elevation gain and wider paths would be ideal.
Many trails in Marin County Open Space Preserves, which include parts of Lucas Valley-Marinwood, allow dogs. However, specific rules regarding leashing and waste removal apply. It's always best to check the Marin County Parks regulations for the specific trail you plan to ride to ensure compliance.
The trails in Lucas Valley-Marinwood are characterized by rolling hills, expansive open meadows, and diverse oak woodlands. You'll find a mix of fun singletrack sections and wider fire roads, offering varied terrain and experiences. Routes like the Mountainbike loop from Marinwood offer a moderate experience through this landscape.
Absolutely. Lucas Valley-Marinwood has 30 difficult-rated routes for experienced riders. For example, the 680 Trail loop from Fairfax is known for requiring good fitness and advanced riding skills, navigating varied and demanding terrain.
A significant natural feature is Big Rock Ridge, which offers spectacular, nearly 360-degree views on clear days, including Mount Burdell, the Golden Gate, and San Francisco. You can also spot the edge of Tomales Bay and even George Lucas's Skywalker Ranch from some vantage points. The area is also rich in diverse oak woodlands and vibrant wildflowers in spring.
Access points and parking vary by trail. Many trailheads within the Lucas Valley Open Space Preserve and surrounding areas offer designated parking. It's advisable to check specific route details on komoot or local park websites for the most accurate parking information for your chosen trail.
While Lucas Valley-Marinwood is primarily residential with open spaces, there are cafes and restaurants in nearby communities like Novato and Fairfax. These towns offer various dining options, some with outdoor seating, perfect for a post-ride meal or coffee.
The area is highly rated by the komoot community, with an average score of 4.6 stars from over 260 reviews. Riders often praise the diverse landscapes, the mix of singletrack and fire roads, and the stunning views, especially from Big Rock Ridge. The variety of routes catering to different skill levels is also a frequently highlighted positive aspect.
Generally, permits are not required for individual riders on most public trails in the Lucas Valley-Marinwood area, which falls under Marin County Open Space Preserves. However, it's always good practice to verify current regulations with Marin County Parks, as rules can change.
Public transportation options, such as Golden Gate Transit and Marin Transit buses, serve areas around Lucas Valley-Marinwood. Some routes may have bike racks, allowing access to trailheads. Checking specific bus routes and their proximity to trail access points is recommended for planning your trip.


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