The Martin Griffin Preserve is open seasonally for visitors and schoolchildren to explore. In the fall and spring, the Preserve hosts its well-regarded nature education programs for elementary schools, which serve thousands of schoolchilden every year. During select Saturdays in spring, summer and fall, the Preserve is open to visitors.

Hours vary depending on season, please check our calendar before arrival.

Spring and Summer 2020

Visit us Saturdays, May 2 through July 25, 2020, 10 a.m. - 4 p.m.
Our program includes themed exploration and activities for all ages. Check calendar for details.
May 2 – Nature Mindfulness
May 9 – It's Your Fault! Earthquakes at Martin Griffin Preserve
May 16 – Fun and Funny Fungi of Martin Griffin Preserve
May 23 – Pond Day
May 30 – Ferns of the Forest
June 6 – Yoga at Henderson Overlook
June 13 – Your Wild Neighbors
June 20 – Redwood Forests
June 27 – ABCs of Trees of Martin Griffin Preserve
July 4 – (open Independence Day)
July 11 – Dazzling Dragons, Dainty Damsels
July 18 – What Could have Been: the History of Martin Griffin Preserve
July 25 – Closing day summer celebration

Fall 2020

Fall exploration on Saturdays, October 3, 10, 17, and 24, 2020, 10 a.m. – 4 p.m. Check calendar for details.

Visit Martin Griffin Preserve throughout our limited Summer Saturday Season, with Nature Guide-led walks, activities, or materials to open your eyes to our lovely preserve in a different way each week. Visitors are also welcome to hike our trails on their own, scoop up a newt at the ponds, peer at birds in Bolinas Lagoon through our scopes, enjoy a picnic under the redwoods, and more. Suggested donation $20.

  • Hike 8+ miles of trails
  • Learn from nature guides
  • View abundant plants & wildlife
  • Visit newt ponds
  • Discover natural wonders in our
  • Curiosity Room
  • Picnic under redwoods
  • Shop the nature bookstore Discount for members!

READ 7x7's review of the Martin Griffin Preserve experience.

NATURE BOOKSTORE: Come browse our selection of field guides, local natural history books, stationery, gifts and nature-inspired toys and books for children. All proceeds from sales in the not-for-profit store help fund ACR programs. ACR members receive a 10% discount.

ADMISSION: Suggested donation of $20 per person supports our programs and management of the 5,000 acres of wildlife sanctuaries owned by ACR. All donations are greatly appreciated! Some programming is fee-based.

DIRECTIONS: click here.


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

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

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 - 2019, 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 2020, ACR continues to monitor heron and egret nesting activities along Bolinas Lagoon. Get the latest updates here:

Phone: 415.868.9244 ext. 110 (message line for the preserve)