The best MTB trails around Lucas Valley-Marinwood

The Big Rock Ridge – 680 Trail loop offers a truly epic mountain biking experience, taking you from shaded lower sections to the exposed, grassy upper reaches of Marin County's second-tallest peak. As you climb, the landscape transforms, opening up to continuous, sweeping views that stretch across the Bay Area, encompassing landmarks like Mount Tamalpais and the distant Pacific Ocean. This route combines flowing singletrack with grueling fire road ascents, providing a diverse and demanding ride.

This is a difficult mountain biking route, covering 26.9 miles (43.3 km) with a substantial 4760 feet (1451 metres) of elevation gain, typically taking around 4 hours and 45 minutes. You'll need very good fitness and advanced riding skills to tackle the steep grades, some of which can exceed 20%. Plan to start early, especially on warmer days, and ensure you carry ample water for this challenging and exposed journey.

What makes this loop particularly notable is its blend of trail types and the sheer scale of its panoramic rewards. The 2.5-mile Big Rock Trail singletrack is considered a local "treasure" for its pleasant, non-technical descent, a rarity in Marin County. This route also serves as a strategic connector, allowing access to other trails within the Marin County Open Space and Marinwood Open Space Districts, making it a cornerstone for advanced riders exploring the region.

The Mountainbike loop from Loma Verde offers a fantastic taste of Marin County's renowned trail network, featuring fun, flowy multi-use trails that wind through scenic open space. You'll be treated to panoramic views of Mount Tamalpais, the San Francisco Bay, and the San Francisco skyline, making every pedal stroke worthwhile. This is a moderate 6.8-mile (10.9 km) route with 1206 feet (368 metres) of elevation gain, typically taking about 1 hour and 15 minutes to complete.

For planning your ride, consider that this loop is part of the larger Lucas, Ignacio, Loma Verde, Pacheco and Marinwood Open Space Trails system. Parking is generally available at trailheads within the open space, but arriving earlier in the day is advisable, especially during peak times. The mild climate of Marin County means this trail is accessible for most of the year, though checking weather conditions for rain or extreme heat is always a good idea.

This trail is a prime example of the region's commitment to creating enjoyable and sustainable multi-use paths, transitioning from older fire roads to more engaging singletrack. It's an excellent option for mountain bikers who appreciate a good workout combined with iconic Californian scenery, offering a rewarding experience without being overly technical.

The Goat Trail loop from Marinwood offers a dynamic mountain biking experience through rolling hills and diverse oak woodlands, providing engaging views of Mount Tamalpais and the San Francisco Bay. You'll navigate a mix of singletrack and wider fire roads, with the Goat Trail itself being a technical 1.0-mile downhill segment featuring roots, rocks, and steep hairpin turns. The scenery shifts from dense evergreen and deciduous trees to open meadows, keeping the ride visually interesting.

This route is a moderate 7.4-mile (11.8 km) loop with a significant 1466 feet (447 metres) of elevation gain, typically taking about 1 hour and 25 minutes. It's best suited for experienced mountain bikers due to its challenging sections and technical terrain. The area can experience extremely dry and loose conditions, so be prepared for that, especially during warmer months. Parking is usually accessible in the Marinwood area, but check local conditions before you go.

Marinwood is widely recognized as the birthplace of mountain biking, adding a layer of historical significance to your ride. The Goat Trail is frequently combined with other local trails, such as the flowy Ponti Ridge, to create longer, more varied loops. Keep an eye out for potential views of the San Francisco skyline and Sonoma on clear days, making this a rewarding ride for those who appreciate both technical challenges and scenic payoffs.