Pine Mountain Loop

The Pine Mountain Loop is approximately 25 kilometers (15.6 miles) long with over 700 meters (2,300 feet) of elevation gain. For most mountain bikers, it takes around 2 hours and 36 minutes to complete, but this can vary significantly based on skill level and how often you stop to enjoy the views.

The terrain is primarily fire road, but it's far from easy. Expect a highly technical ride with significant rockiness and steep grades, some exceeding 20%. You'll encounter rocky climbs, curvy and steep descents, and potentially ruts from winter flooding. It demands both physical effort and technical skill.

No, this loop is considered challenging, even for advanced riders, and is not recommended for beginners. The steep, rocky sections and technical descents require significant skill and experience. While shorter rocky parts can be walked, the overall ride presents a substantial physical and technical test.

The trail remains green in the summer due to streams and springs, offering a pleasant contrast to drier surrounding areas. However, winter can bring ruts from flooding, adding to the technical challenge. Spring and fall generally offer ideal conditions with moderate temperatures and less chance of extreme weather.

As this trail is located within the Mount Tamalpais Watershed, specific regulations apply. Generally, dogs are permitted on fire roads within the watershed but must be kept on a leash. Always check the latest regulations from the Marin Municipal Water District (MMWD) before heading out.

No, there are no entrance fees or permits required to access the Mount Tamalpais Watershed for recreational activities like mountain biking on designated trails. However, it's important to respect all watershed rules and regulations, which are in place to protect the natural environment and water quality.

Parking is available at various points around the Mount Tamalpais Watershed. A common starting point for this loop is near Fairfax, often utilizing parking areas that provide access to the fire road network. Be sure to check local signage for specific parking regulations and availability.

The loop offers expansive views in all directions, including the San Francisco Bay to the east and Tomales Bay to the west. You'll also pass through a unique dwarf Sargent cypress forest. A significant portion of the route follows the historic Pine Mountain Fire Road, which is part of mountain biking's hallowed ground near Repack Road, the site of the sport's origins.

Yes, the route extensively uses the Pine Mountain Fire Road and San Geronimo Ridge Road. It also overlaps with sections of the Bay Area Ridge Trail - 01 - North Bay, and smaller portions of trails like Paradigm, Happersberger Trail, and Azalea Hill Trail.

Given the challenging and remote nature of the ride, it's crucial to be self-sufficient. Pack plenty of water, snacks, a repair kit (including spare tubes, pump, and multi-tool), a first-aid kit, and navigation tools. Wearing appropriate safety gear, including a helmet, is essential. Be prepared for varying weather conditions.

The town of Fairfax, located near common access points for the Mount Tamalpais Watershed, offers various amenities including cafes, restaurants, and bike shops. It's a good place to fuel up before your ride or relax afterward.