Maurice Thorner Preserve
An easy-going San Geronimo pocket preserve
Rangers Recommend
- A single, gently sloping trail carries visitors to a low ridge above San Geronimo Valley. Enjoy views of White Hill and Gary Giacomini Preserve on a clear day.
- Thorner Ridge Trail connects to a bridge that crosses Nicasio Valley Road, providing access to Roy's Redwoods Preserve.
- For a longer loop hike take Thorner Ridge Trail to French Ranch Preserve, via a brief walk on Lagunitas School Road.
- The 33-acre preserve was donated by Daniel "Jeff" Thorner, a vice-principal at Terra Linda and San Rafael high schools and a successful businessman.
- Dogs are welcome, but must be leashed at all times.
Naturalist Notes
- See madrone, coyote brush, coast live oak, big-leaf maple, California bay, California nutmeg, and hazelnut trees.
- Spring wildflowers include mariposa lily, and clarkia.
- Listen for the chatter of woodpeckers.
- Check out the iNaturalist field guide [External]. Add your own observations.
Activities
Know Before You Go
- Stay on roads and trails to preserve sensitive ecosystems and to avoid trespassing on private property.
- Dress appropriately for the weather. Trails can be muddy during rainy season. In summer use sun protection–there is no shade.
- Bring water.
- There are no restrooms at this location.
- Steer clear of poison oak.
- After an outing, check for ticks.
Download Preserve Map