Outdoors · San Geronimo

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.

At a glance

San Geronimo outdoors

Conserved land
66%
637 of 960 acres
Trails
6.6 mi
4.4 mi per sq mi · 6 on conserved land
Parks & preserves
4
named on the map
Bike routes
0.0 mi
0.0 mi lanes · 0.0 mi off-road paths

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.

Map

Conserved land, trails & bike routes

1234
Tap a number or a place below to zoom in© OpenStreetMap contributors · USGS PAD-US
Places to walk

Parks & preserves with trails

Ranked by mapped trail miles. Directions go to the nearest marked trailhead or public parking.
1

Gary Giacomini Open Space Preserve

Managed by Marin County Parks
578 acres5.5 mi of trail
Hunt Camp TrailWillis Evans TrailBates Canyon Trail
Dog rules not recorded
No trailhead mapped yet Website
2

San Geronimo Meadow

Managed by Marin Open Space Trust
8 acres0.3 mi of trail
Dog rules not recorded
No trailhead mapped yet
3

San Geronimo Park

Managed by Marin County Parks
8 acres
Dog rules not recorded
No trailhead mapped yet Website
4

Mount Tamalpais Watershed

Managed by Marin Municipal Water District
1 acres0.1 mi of trail
Dog rules not recorded
No trailhead mapped yet Website
Things to do

Beaches, playgrounds, falls & more

Pick a kind of place for the list, directions, or pins on the map above.
Peaks in San Geronimo
Green Hill1,381 ft elevation · In Gary Giacomini Open Space Preserve
Directions
Trails

Named trails

Unpaved 2.0 mi
  • Hunt Camp Trail1.4 mi
  • Willis Evans Trail0.7 mi
  • Chaparral Lane Trail0.1 mi
  • Bates Canyon Trail0.1 mi
Water

Lakes & rivers

Tap a name for directions.

Who protects the land

637 conserved acres

Who manages it, from PAD-US. Approximate, because parcels can overlap.
Regional agency
636 ac
Land trusts & nonprofits
8 ac
Regional Water Districts
1 ac

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.

Biking & sports

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.

Public lands

The biggest protected places in San Geronimo

From USGS PAD-US: who manages each one and whether visitors are welcome.
Local Conservation Area 566 acUnknown Easement 55 acLocal Other or Unknown 15 acLocal Park 8 acLocal Resource Management Area 1 ac
PlaceManaged byAcresPublic access
Gary Giacomini Open Space PreserveLocal Conservation AreaRegional agency566Open
San Geronimo Ridge AcqLocal Other or UnknownRegional agency15Open
San Geronimo County ParkLocal ParkRegional agency8Closed
Marin Municipal Water District WatershedLocal Resource Management AreaRegional Water Districts1Open
Nearby

San Geronimo and its neighbors

Towns whose outdoors data has been built so far.
TownConservedTrailsParks & preserves
San Geronimo66.3%6.6 mi4
Woodacre36.1%8.9 mi4
Lagunitas-Forest Knolls42.4%20.4 mi7
Trail talk

Conditions & tips from neighbors

No recent posts about San Geronimo's trails yet. Muddy, icy, a bridge out, where to park: a quick post helps the next person.

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.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/19 · 2025-01-01