Pygmy (dwarf) sargent cypress forest

The Pine Mountain and Kent Lake Loop offers a grand tour of the Mount Tamalpais Watershed, immersing you in a landscape that shifts from dense forest to open ridges with sweeping views. You'll traverse varied terrain, passing by the serene Kent Lake Inlet and ascending to the summit of Pine Mountain, where you can appreciate the unique Pygmy (dwarf) sargent cypress forest. This is a challenging route, but the diverse scenery and expansive vistas from viewpoints like the Kent Lake Overlook from San Geronimo Ridge make the effort worthwhile.

This difficult hiking route covers a substantial 17.4 miles (28.0 km) with 2946 feet (898 metres) of elevation gain, requiring approximately 8 hours and 24 minutes to complete. An early start is highly recommended to allow plenty of daylight, and you should carry sufficient water and provisions for the entire journey. While specific parking information isn't detailed, plan to arrive early at the trailhead, particularly on busy days, to ensure a spot.

Located in Marin County, this loop is a significant undertaking that showcases the rugged beauty of the region's natural environment. It's a fantastic option for experienced hikers looking for a long, demanding day on the trails, offering a deep connection with the wilderness and a sense of achievement upon completion. The trail provides a comprehensive experience of the local ecosystem, from the unique dwarf cypress trees to the expansive lake views.

The San Geronimo Ridge Road via B-17 Trail loop offers a truly diverse hiking experience, winding through lush conifer forests, rocky sections, and open meadows. You'll encounter serene redwood trees and ferns near the trailheads, then climb to enjoy stunning shoreline views across Kent Lake. The route is a difficult 11.4 miles (18.3 km) with 2298 feet (701 metres) of elevation gain, taking about 5 hours and 45 minutes, making it ideal for hikers who appreciate varied terrain and a good challenge.

Planning your visit is relatively simple, as the trail is generally accessible year-round for hikers, gravel bikers, and horseback riders. Dogs are permitted, usually on-leash on trails and under voice command on fire roads. There are no specific permits or fees required, but always remember to bring plenty of water, especially when hiking in warmer weather, as parts of the ridge can be quite exposed.

This trail is notable for its unique pygmy Sargent Cypress forest found on the windswept ridge, where ancient trees are dwarfed by the serpentine soil. Portions of San Geronimo Ridge Road are also part of the larger Bay Area Ridge Trail, offering expansive views and connections to other regional paths. The area boasts a wide variety of trees, including madrone, Douglas-fir, oak, and bay, providing a rich natural environment to explore.