Marin County Parks and Open Space Department

The Marin County Open Space District (MCOSD) manages 34 open space preserves offering visitors outstanding scenic vistas, redwood groves, cascading waterfalls, opportunities for wildlife viewing, and other natural amenities. Preserves are managed primarily for natural resource preservation and, with the exception of trails used by pedestrians, mountain bikers, and equestrians, do not contain recreational facilities of the types found in parks. The MCOSD’s 34 open space preserves include an extensive network of approximately 249 miles of roads and trails, 335 entry points to nearly 16,000 acres of lands managed by the MCOSD and many thousands of additional acres owned and managed by neighboring city, special district, state, and federal jurisdictions.

If you know the name of the preserve you want to visit or learn about, use the Jump to Preserve (dropdown menu to the left) feature to get that preserve’s detail page. You can also use the interactive map to view and learn about all preserves.


MCOSD preserves are open 24 hours a day, with the exceptions of Ring Mountain and Roy’s Redwoods preserves, which are open during daylight hours, from sunrise to sunset.

Group Use

No group, school, club or similar organization, whether formally organized or not, shall hold or conduct any activity on Open District lands with twenty or more participants without prior written approval of the Open Space District. Group use of district lands is subject to prior reservations, conditions and charges. Please contact Open Space rangers at (415) 473-2816 if you have questions.

Other Power-Driven Mobility Devices

For inquiries concerning the use of a power-driven mobility device on a County trail, pursuant to Title II of the Americans with Disabilities Act, § 35.137, Mobility Devices, please contact Principal Planner Steve Petterle at (415) 473-6394.


Most fire road and trailhead access points to MCOSD preserves are located in residential neighborhoods. Visitors will not find developed parking areas, paved or unpaved, but will often find limited street parking. Be respectful of our open space neighbors: do not block driveways or entry ways, do not park in reserved spaces, do not litter, control your noise levels, and keep dogs out of neighboring yards.

Preserve Locations

We have preserves are all over the county, and they're easily located using our interactive map.

For those who'd like to download a map of both our parks and preserves, we also have a PDF for your convenience.

To view access points to out preserves, or to get directions from your location, please use the Marin County Open Space Google Map below: