ACR’s Martin Griffin Preserve is open to the public for our spring and summer season through July 31, Tuesdays–Fridays by appointment only, and on weekends and holidays without appointment. We are closed on Mondays.


April 2–June 5
Tuesday–Friday, 2pm–4pm, by appointment only
Saturday–Sunday and Memorial Day (May 30), 10am–4pm

June 7–July 31
Tuesday–Friday, 10am–4pm, by appointment only
Saturday–Sunday and Fourth of July (July 4), 10am–4pm.


ADMISSION: Donation $15/person.


Martin Griffin Preserve
4900 Shoreline Highway 1
Stinson Beach, CA
Click here for directions, map and public transit info.
Phone: 415.868.9244 ext. 110

The Preserve is located between the towns of Stinson Beach and Bolinas in west Marin County, California. Parking is very limited, carpooling is encouraged.

Visitors are encouraged to hike over eight miles of fern-lined trails, discover ponds with newts and other aquatic life, enjoy a picnic under the redwoods and explore our bookstore, as well as take in views of the birds on Bolinas Lagoon. On weekends, volunteer ranch guide naturalists are on hand to lead hikes and answer questions about the history, stewardship and preservation of the Preserve.

To make an appointment during the week, call 415.868.9244 ext. 110

Special events at Martin Griffin Preserve

  • Conservation Talks. Select Saturdays beginning May 21. Regional conservation leaders share the latest on a range of topics. Saturday mornings, 11am - 12:30pm. Reservation required through
  • Nature Connection. Join us for nature-based yoga in the canyon, storytelling, field sketching and more as we kick off our summer event series. See calendar for upcoming events.
  • Mothers Day Picnic – annual event for families held on Monther's Day! Bring families and friends to the magnificent meadow of Volunteer Canyon and enjoy time outdoors, a picnic in the meadow and a hike up the canyon. Proceeds benefit Audubon Canyon Ranch and Marin Audubon Society.  $28 per adult; $12 children 12 and under.


...And four more talks through July 23. The talks are free but reservation is required: Suggested donation of $15-25 supports our education programs such as the Conservation Talks and management of the 5,000 acres of wildlife sanctuaries owned by ACR.



Looking for information on our Heronry?

For more than 70 years, Martin Griffin Preserve hosted one of the most significant and well-studied Great Blue Heron, Great Egret and Snowy Egret nesting sites on the West Coast, with as many as 175 breeding pairs of herons and egrets nesting in the tops of the redwood trees in Picher Canyon. In 2013 the preserve nesting sites were abandoned in favor of others on the western shore of Bolinas Lagoon and elsewhere in the Bay Area. Although no one knows why the birds left, we suspect avian predators (Bald Eagles) as the likely cause.

While the herons and egrets did not return to Martin Griffin Preserve in 2014 or 2015, the productivity of the new nests established on the western side of the lagoon since 2013 indicates that the quality of feeding areas and the availability of food in Bolinas Lagoon has continued to be very good. In fact, egrets with successful (undisturbed) nests in the Bolinas colony were able to provision and fledge more young, on average, than egrets nesting in most other areas of the San Francisco Bay region.

Although we don’t know if the birds will return in 2016, ACR continues to monitor heron and egret nesting activities along Bolinas Lagoon. Get the latest updates here:


Call 415.868.9244 ext. 110


Photo Credits: 

  • Mike Witkowski