Picnic Rock & Spanish Trail loop

The loop is approximately 8.7 km (5.4 miles) long and generally takes around 2 hours and 55 minutes to complete. This duration can vary based on your pace and how often you stop to enjoy the views.

The terrain features rolling ridgetop grasslands with unique serpentine soil. You'll encounter a mix of paved and unpaved paths, fire roads, and natural surfaces. Some sections, especially if starting from certain trailheads, can have strenuous, steep ascents, while others like the Heathcliff Fire Road are wide dirt trails with gentler undulations.

Hikers are treated to expansive panoramic vistas of the San Francisco skyline, the Golden Gate Bridge, Angel Island, the Marin Headlands, and both San Francisco and San Pablo Bays. The highlight Picnic Rock offers particularly stunning viewpoints.

Yes, the route passes by several points of interest. You'll encounter the historic Old St Hilary Church ⛪, a Carpenter Gothic church built in 1888, and the scenic Picnic Rock, known for its incredible views. The preserve itself is also notable for its unique serpentine soil ecosystem and diverse plant life.

Spring and early summer are particularly rewarding due to the vibrant display of wildflowers, including lupines, California poppies, and the rare Tiburon jewelflower (typically mid-May to mid-June). However, the trail offers beautiful views year-round, with clear days providing the best panoramas.

Yes, the preserve is dog-friendly. Dogs are allowed on leash on all trails, and on fire roads, they can be off-leash if under voice control. Please ensure you clean up after your pet.

Parking is available at various trailheads around Old Saint Hilary's Open Space Preserve. While some sections, like those starting from the Fishbits Trailhead, can be strenuous, other trailheads such as Heathcliff offer a more moderate starting point with less elevation gain. Specific parking details can often be found on local park websites.

No, there are no permits or entrance fees required to access Old Saint Hilary's Open Space Preserve. It is open to the public for recreational use.

The preserve is home to a unique ecosystem with over 200 plant species, many native to the peninsula. In spring, expect to see wildflowers like lupines, johnny-jump-ups, and California poppies. Keep an eye out for the rare Tiburon jewelflower. Birdwatchers might spot American kestrels, red-tailed hawks, and northern harriers.

Yes, the Picnic Rock & Spanish Trail loop incorporates sections of several other paths. You'll hike along parts of the San Francisco Bay Trail, Vistazo Fire Road, Heathcliff Fire Road, Spanish Trail, and Lyford Fire Road.

While the loop is generally considered moderate, some sections involve steep ascents, gaining around 400 feet in elevation. Good fitness is recommended for the more challenging parts. However, the preserve is suitable for various skill levels, and starting from trailheads like Heathcliff can offer a gentler experience.