San Geronimo Ridge

This difficult 11.0-mile hiking loop in Gary Giacomini Open Space Preserve offers diverse terrain, ridge views, and a quiet experience.

The San Geronimo Ridge Loop offers a delightful journey through Marin County's varied ecosystems, transitioning from shaded redwood canyons to open grassy hillsides. You'll traverse a mix of wide fire roads and narrower singletrack, with the highlight being the tranquil views of Kent Lake, Marin County's largest reservoir. This easy 3.7-mile (5.9 km) hike, with 774 feet (236 metres) of elevation gain, takes about 1 hour and 52 minutes, making it a perfect option for a quick, scenic outing. It's a great way to experience diverse terrain without a strenuous commitment.

Planning your visit is straightforward; the trailhead is generally accessible, though arriving early is always a good strategy for parking, especially on busy days. The trail's extensive tree cover makes it a pleasant option even when temperatures rise, and the less crowded nature of these trails provides a peaceful escape. Consider visiting on a clear day for the best views across the valleys.

This particular loop is a segment of the larger Bay Area Ridge Trail network, showcasing a wide range of ecosystems from dwarf Sargent cypress to redwoods. It's known for its stunning views of Kent Lake and Peter's Dam, offering a tranquil and scenic highlight. If you're looking for a less crowded trail that still delivers on natural beauty and diverse landscapes, this San Geronimo Ridge Loop is a top choice in the Marin County area.