San Geronimo Valley Planning Group

Protecting  and enhancing our natural resources and rural character since 1972

Look around you! It's hard to believe that until the 1970s there was no county public open space or public trails in the San Geronimo Valley. Luckily, the environmental movement of this period produced local leaders who organized the San Geronimo Valley Planning Group. They created a survey that led to the first Community Plan in the County in 1977.  And they began the process of protecting and preserving the Valley's special open spaces (creeks, meadows, forest, ridgelines, wildlife and plants) and rural lifestyle that continues to this day.

Four Special Preserves

More than 2,300 acres of open space to explore!

Maurice Thorner

A series of steep switchbacks over mainly open hillside takes you to the top of this low-rolling, 33-acre ridge in the heart of the Valley.


Roy's Redwoods

This 309-acre gem contains magnificent redwoods that rival the size of their more famous cousins in Muir Woods.


French Ranch

An important part of the Lagunitas Creek watershed, this 403-acre parcel provides stunning views of the Valley and San Geronimo ridge.


Gary Giacomini

Enjoy hiking, biking, dog walking and horseback riding on 1,600 acres wrapping around each village on the south side of the Valley.


More places to enjoy

From coho-viewing to children's playgrounds, find it here.

Helpful Hints for Living a Healthy Rural Lifestyle

Can you love redwood trees too much? Is there an easy way to get rid of yellowjackets? Does anyone eradicate Japanese knotweed for free?

Click on the links below to get answers to these questions and more.


Woodacre Flats: groundwater levels and septic concerns


Proposed New County Fire Station Headquarters

Lagunitas Creek Restoration Project


Dark Sky Lighting

Easy Ground Wasp Removal

Roy's Redwoods Restoration Project

Wildfire Safety Tips

Dealing with Japanese Knotweed

Monitoring Your Air Quality

Enhanced Vegetation Management (PG&E)


Learn about the new, regional weather forecasting system (AQPI) that will include the installation of a C-band radar on Mt. Barnabe. The system is designed to track approaching atmospheric river events more precisely so that agencies in charge of flood control, water supply, and wastewater management can be better prepared ahead of time. Read more...