1
Frank G. Bonelli Regional Park
Park
1,784 acres25.3 mi of trail
Bonelli TrailPark View TrailLake View TrailKikos TrailLower Bee Hive Trail
Dogs on leashMapped in OpenStreetMap
DirectionsTo the parking lot
Outdoors · San Dimas
San Dimas, CA parks, trails & bike paths
About 36% of San Dimas is conserved land, roughly 3,526 acres. There are about 44 miles of mapped trails, and the biggest networks are in Frank G. Bonelli Regional Park (25.3 mi), San Gabriel Mountains National Monument (3.7 mi), and Horsethief Canyon Park (2.5 mi).
Conserved land, trails, parks and bike routes in San Dimas, measured from OpenStreetMap and USGS data.
At a glance
San Dimas outdoors
Conserved land
36%
3,526 of 9,826 acres
Trails
44 mi
2.8 mi per sq mi · 35 on conserved land
Parks & preserves
14
104 conserved acres per 1,000 residents
Bike routes
13.9 mi
9.6 mi lanes · 4.3 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
San Gabriel Mountains National Monument
Managed by United States Forest Service
1,204 acres3.7 mi of trail
Johnstone Peak Truck TrailSycamore Flats MotorwayBluebird Motorway
Dog rules not recorded
No trailhead mapped yet
3
Horsethief Canyon Park
Park
108 acres2.5 mi of trail
Dog rules not recorded
DirectionsTo the parking lot
4
San Dimas Canyon Park
Park
53 acres1 mi of trail
Dog rules not recorded
DirectionsTo the parking lot
5
Walnut Creek Park
Park
52 acres1 mi of trail
Antonovich TrailAntonovich Oak Loop TrailAntonovich South Spur Trail
Dogs on leashMapped in OpenStreetMap
DirectionsTo the trailhead
6
Lone Hill Park
Park
9 acres0.4 mi of trail
Dog rules not recorded
DirectionsTo the parking lot
All 14 parks & preserves
Showing 1–10 of 14 parks & preserves
Frank G. Bonelli Regional Park1,784 acres · 25.3 mi of trail
San Gabriel Mountains National Monument1,204 acres · 3.7 mi of trail · United States Forest Service
Horsethief Canyon Park108 acres · 2.5 mi of trail
San Dimas Canyon Park53 acres · 1 mi of trail
Walnut Creek Park52 acres · 1 mi of trail
Lone Hill Park9 acres · 0.4 mi of trail
Pioneer Park4 acres · 0.2 mi of trail
Angeles National Forest1,284 acres · 0.1 mi of trail · United States Forest Service
Briggs Point Park1 acres · 0.1 mi of trail
Marchant Park14 acres
Who protects the land
3,526 conserved acres
Who manages it, from PAD-US. Approximate, because parcels can overlap.
Biking & sports
Bike routes, courts & fields
- Painted or protected bike lanes9.6 mi
- Off-road bike paths4.3 mi
- Shoulders & shared lanes0.0 mi
- Bonelli Trail (bike route)8.5 mi
- Park View Trail (bike route)1.8 mi
- Antonovich Trail (bike route)1.5 mi
- Tree Line Trail (bike route)0.8 mi
Courts & fields
- Tennis21
- Baseball14
- Basketball6
- Equestrian6
- Football1
- Skate park1
Counts include school and college facilities, which aren't always open to the public.
Nearby
San Dimas and its neighbors
Towns whose outdoors data has been built so far.
| Town | Conserved | Trails | Parks & preserves |
|---|---|---|---|
| San Dimas | 35.9% | 43.8 mi | 14 |
| La Verne | 11.3% | 6.7 mi | 19 |
| Pomona | 2.8% | 5.8 mi | 26 |
| Covina | 1.7% | 4.3 mi | 12 |
| Glendora | 32.9% | 26.1 mi | 15 |
| Charter Oak | 2% | 0.4 mi | 1 |
Trail talk
Conditions & tips from neighbors
No recent posts about San Dimas'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.