Pine Mountain Fire Road

The Pine Mountain Loop offers a challenging mountain biking experience through Marin County's scenic landscapes. You'll navigate primarily fire roads, but expect very rocky and steep sections, some with grades over 20%, that demand technical skill. The route rewards your effort with expansive views of the San Francisco Bay and Tomales Bay, and a unique passage through a dwarf Sargent cypress forest.

This moderate 15.6-mile (25.2 km) loop involves a significant 2349 feet (716 metres) of elevation gain, typically taking around 2 hours and 36 minutes. Winter flooding can create ruts, so be prepared for potentially rougher conditions. The trail can feel remote in parts, so carry enough water and supplies for the duration of your ride.

Beyond the physical challenge, this trail is steeped in mountain biking history, overlapping with Repack Road, considered a birthplace of the sport. It also forms part of the long-standing Thanksgiving Day 'Appetite Seminar' ride. The route offers a substantial, winding descent if ridden clockwise, but watch out for the notorious 'ET curve' known for spills.

The Fairfax – Alpine Lake - Bon Tempe Dam loop from Larkspur offers a diverse mountain biking experience, winding through tranquil redwood forests and past two stunning lakes. You'll encounter a mix of wide gravel trails and dirt roads, with some challenging steep sections, all while enjoying panoramic views of Bon Tempe Lake, Alpine Lake, and Mount Tamalpais. This difficult 36.0-mile (58.0 km) route is a true test of endurance, with 3289 feet (1002 metres) of elevation gain, typically taking around 4 hours and 53 minutes to complete.

Planning your ride means being prepared for a day-use fee, usually for parking, so have that in mind before you arrive. While many parts of the route are multi-use, it's crucial to respect regulations, as mountain bikes are not allowed on all hiking trails, especially singletrack. Spring is a fantastic time to visit, as the watershed bursts with wildflowers like sky lupines, adding an extra layer of beauty to the already picturesque landscape.

What makes this route stand out is its ability to connect multiple lakes within the Mount Tamalpais Watershed, offering a comprehensive tour of the area's natural beauty. Beyond the impressive views, the region is rich in wildlife, including various bird species like egrets and ospreys, and even turtles. This loop provides an excellent way to experience the diverse landscapes and trails, making it a notable choice for advanced mountain bikers in Marin County.