Gary Giacomini Preserve

• San Geronimo Ridge Fire Road, five miles long, traverses an amazingly scenic ridgeline.
• This preserve connects with White Hill and Cascade Canyon. It also borders Marin Municipal Water District lands above Kent Lake, forming an immense expanse of pristine forests stretching all the way to Mount Tamalpais.
• A lush redwood canyon trail is named to honor Willis Evans, a tireless environmental advocate who spearheaded local efforts to preserve coastal streams.
• Dogs welcome and must be leashed on trail, and under voice command on fire roads, with leash readily available.

• Look for the pygmy Sargent Cypress forest on windswept San Geronimo ridge. Some of the trees are hundreds of years old, but have been dwarfed by serpentine soil.
• Diverse soils and micro-climates across the preserve provide conditions for a wide variety of trees to thrive, including redwood, madrone, Douglas-fir, oak, and bay.
• In spring, lower elevations brighten with masses of violets. Also look for trillium, chaparral paintbrush, California poppy, fetid adder's tongue, iris, and monkeyflower.
• To protect sensitive wildlife species, some roads and trails are subject to seasonal night closures. Observe closure signs.
• Check out the citizen science bioblitz on iNaturalist. Add your own observations.

• Stay on roads and trails to preserve sensitive ecosystems and to avoid trespassing on private property.
• Be courteous and safety conscious when sharing roads and trails. Go slow and say hello.
• Dress appropriately for the weather. Trails can be muddy during rainy season.
• Bring water.
• Track your path. It can be easy to get lost in this vast of a preserve.
• There are no restrooms at this location.
• Steer clear of poison oak.
• After an outing, check for ticks.

From Hwy 101 in Larkspur, take the exit for Sir Francis Drake Blvd west 7.7 miles. Turn left onto Railroad Ave, sharp right onto San Geronimo Valley Dr, and take the second left onto Redwood Canyon Dr. The gate is immediately on the right.

Street parking only. Please be respectful of local residents.

• Golden Gate Highway and Transportation District
• Marin Transit Trip Planner
• Route from San Rafael Transit Center

You can also dial 511 to find out about transit options from your location.

• No smoking or fires.
• Weapons and hunting prohibited.
• Motorized vehicles prohibited. (Individuals with qualified disabilities may operate certain kinds of zero-emission mobility devices on some roads,multiuse trails, and certain other facilities.)
• Everyone must yield the right-of-way to horses. Bikes must also yield to pedestrians.
• No model airplanes, drones, or other self-propelled crafts.
• Permit required for commercial use and groups of more than 15 people.
• Dispose of waste property. Pack it out.
• All resources are protected. Do not follow, approach, or feed wildlife.

DOGS

• Dogs may be off-leash on fire roads only if kept under voice control. Leash must always be readily available.
• Dogs are allowed on signed trails and must be leashed. Leash must not exceed 6 feet in length.
• Off-fire road and off-trail use prohibited.
• Individuals accompanying dogs are required to clean up and remove pet waste.
• A maximum of 3 dogs per person is permitted with exception granted through commercial use permit.

BIKES

• Permitted on signed fire roads and trails designated for multiuse and hikers/bikes.
• Off-fire road and off-trail use prohibited.
• Speed limit is 15 mph or less. Must slow to 5 mph when passing others or around blind turns.
• Electric bicycles are not permitted.

HORSES

• Permitted on signed fire roads and trails designated for multiuse and hikers/horses.
• Off-fire road and off-trail use prohibited except when watering or resting the horse.

In an emergency, call 911. To report an incident or suspicious activity, call the Ranger Field Office at (415) 473-2816 or submit an Incident Report via online form.

Visitors are responsible for knowing and obeying all Marin County Open Space District (MCOSD) regulations. Citations will be issued for violations. Read the official regulations: Marin County Municipal Code Appendix A.

Call (415) 473-6387 for more information regarding allowable types and use of mobility devices for people with qualified disabilities.

The MCOSD is a special district pursuant to the California Public Resources Code. Marin County Parks oversees the management of the county parks system and provides public information on behalf of the MCOSD.