San Geronimo, CA parks, trails & bike paths
About 66% of San Geronimo is conserved land, roughly 637 acres. There are about 6.6 miles of mapped trails, and the biggest networks are in Gary Giacomini Open Space Preserve (5.5 mi).
Conserved land, trails, parks and bike routes in San Geronimo, measured from OpenStreetMap and USGS data.
San Geronimo outdoors
Conserved land is a share of the whole town area. Bike lanes are often missing from the map in smaller towns, so that number is likely low.
Conserved land, trails & bike routes
Parks & preserves with trails
San Geronimo Meadow
San Geronimo Park
Mount Tamalpais Watershed
Beaches, playgrounds, falls & more
Named trails
- Hunt Camp Trail1.4 mi
- Willis Evans Trail0.7 mi
- Chaparral Lane Trail0.1 mi
- Bates Canyon Trail0.1 mi
Lakes & rivers
Tap a name for directions.
637 conserved acres
Conserved doesn't always mean open to visitors. 47 acres are conservation easements, which are usually private land. The places listed above are parks and preserves people visit.
Bike routes, courts & fields
- Painted or protected bike lanes0.0 mi
- Off-road bike paths0.0 mi
- Shoulders & shared lanes0.0 mi
Courts & fields
- Tennis1
Counts include school and college facilities, which aren't always open to the public.
The biggest protected places in San Geronimo
| Place | Managed by | Acres | Public access |
|---|---|---|---|
| Gary Giacomini Open Space PreserveLocal Conservation Area | Regional agency | 566 | Open |
| San Geronimo Ridge AcqLocal Other or Unknown | Regional agency | 15 | Open |
| San Geronimo County ParkLocal Park | Regional agency | 8 | Closed |
| Marin Municipal Water District WatershedLocal Resource Management Area | Regional Water Districts | 1 | Open |
San Geronimo and its neighbors
| Town | Conserved | Trails | Parks & preserves |
|---|---|---|---|
| San Geronimo | 66.3% | 6.6 mi | 4 |
| Woodacre | 36.1% | 8.9 mi | 4 |
| Lagunitas-Forest Knolls | 42.4% | 20.4 mi | 7 |
Conditions & tips from neighbors
Sources: trails, parks, preserves, courts and bike lanes © OpenStreetMap contributors (ODbL), map data as of 2026-09-28. Conserved land: USGS Gap Analysis Project, Protected Areas Database of the United States (PAD-US). Measured against the Census town boundary.
How we measure
"Trails" are OpenStreetMap paths, bridleways, public tracks and unpaved footways, plus footways inside a park or preserve or on a named trail route. Sidewalks are left out. Areas are counted on a 20-meter grid, so overlapping parcels count once. "Conserved" includes conservation easements, which protect land from development but are usually private property. Trailheads are the nearest marked trailhead, public parking lot or information board within about 150 meters of a preserve. Dog rules come from OpenStreetMap when someone has tagged them; otherwise we show what's typical for the land manager, or say the rules aren't recorded.