1
Blithedale Summit Open Space Preserve
Managed by Marin County Parks
275 acres5.5 mi of trail
Warner Canyon TrailMaytag TrailTartan Trail
Dog rules not recorded
Outdoors · Mill Valley
Mill Valley, CA parks, trails & bike paths
About 25% of Mill Valley is conserved land, roughly 785 acres. There are about 22 miles of mapped trails, and the biggest networks are in Blithedale Summit Open Space Preserve (5.5 mi), Camino Alto Open Space Preserve (2.9 mi), and Horse Hill Open Space Preserve (1.3 mi).
Conserved land, trails, parks and bike routes in Mill Valley, measured from OpenStreetMap and USGS data.
At a glance
Mill Valley outdoors
Conserved land
25%
785 of 3,100 acres
Trails
22 mi
4.6 mi per sq mi · 15 on conserved land
Parks & preserves
16
56 conserved acres per 1,000 residents
Bike routes
16.2 mi
6.9 mi lanes · 2.3 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
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.
2
Camino Alto Open Space Preserve
Managed by Marin County Parks
110 acres2.9 mi of trail
Val Vista TrailBay Vista Trail
Dog rules not recorded
3
Horse Hill Open Space Preserve
Managed by Marin County Parks
62 acres1.3 mi of trail
Horse Hill Trail
Dog rules not recorded
No trailhead mapped yet
Website
4
Alto Bowl Open Space Preserve
Managed by Marin County Parks
35 acres1.1 mi of trail
Bob Midagh TrailHorse Hill Trail
Dog rules not recorded
No trailhead mapped yet
Website
5
Hauke Park
Park
14 acres0.7 mi of trail
Dog rules not recorded
DirectionsTo the parking lot
6
Bayfront Park
Park
13 acres0.7 mi of trail
Dog rules not recorded
DirectionsTo the parking lot
7
Edgewood Park
Park
11 acres0.4 mi of trail
Dog rules not recorded
No trailhead mapped yet
All 16 parks & preserves
Showing 1–10 of 16 parks & preserves
Blithedale Summit Open Space Preserve275 acres · 5.5 mi of trail · Marin County Parks
Camino Alto Open Space Preserve110 acres · 2.9 mi of trail · Marin County Parks
Horse Hill Open Space Preserve62 acres · 1.3 mi of trail · Marin County Parks
Alto Bowl Open Space Preserve35 acres · 1.1 mi of trail · Marin County Parks
Hauke Park14 acres · 0.7 mi of trail
Bayfront Park13 acres · 0.7 mi of trail
Edgewood Park11 acres · 0.4 mi of trail
Boyle Park7 acres · 0.2 mi of trail
Old Mill Park5 acres · 0.2 mi of trail
Mount Tamalpais Watershed11 acres · 0.1 mi of trail · Marin Municipal Water District
Who protects the land
785 conserved acres
Who manages it, from PAD-US. Approximate, because parcels can overlap.
Biking & sports
Bike routes, courts & fields
- Painted or protected bike lanes6.9 mi
- Off-road bike paths2.3 mi
- Shoulders & shared lanes7.0 mi
- San Francisco Bay Trail (bike route)0.8 mi
Courts & fields
- Tennis27
- Basketball8
- Baseball6
- Soccer4
- Skate park1
- Football1
Counts include school and college facilities, which aren't always open to the public.
Nearby
Mill Valley and its neighbors
Towns whose outdoors data has been built so far.
| Town | Conserved | Trails | Parks & preserves |
|---|---|---|---|
| Mill Valley | 25.3% | 22.1 mi | 16 |
| Tamalpais-Homestead Valley | 49% | 22.6 mi | 4 |
| Corte Madera | 37.3% | 10.6 mi | 8 |
| Strawberry | 15.2% | 2.6 mi | 6 |
| Larkspur | 24% | 10.4 mi | 11 |
| Kentfield | 21.6% | 9.4 mi | 6 |
Trail talk
Conditions & tips from neighbors
No recent posts about Mill Valley'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.