Frank G. Bonelli Regional Park
Park
1,784 acres25.3 mi of trail
Bonelli TrailPark View TrailLake View TrailKikos Trail+1
Dogs on leash
Directionsto the parking lot
Photo: YonderStone · CC BY-SA 4.0A+Outdoors
Outdoors in San Dimas
San Dimas has 44 miles of mapped trails, 2.9 for every square mile of land
37% of San Dimas’ land is conserved, about 3,526 acres. 2,242 acres are parks and preserves, 66 per 1,000 residents. 93% of residents live within a half mile of a park.
Ahead of 98% of U.S. towns · #47 of 847 in California. What drives it
Conserved land
37%
3,526 acres · of 15.0 sq mi of land
Trails
44 mi
2.9 per sq mi of land
Park land
2,242 ac
66 acres per 1,000 residents
Near a park
93%
of residents within ½ mile
Bike routes
14 mi
9.6 mi lanes · 4.3 mi paths
Highest peak
3,169 ft
Johnstone Peak
Lakes & rivers
1
2 beaches · 4 boat launches
What kind of outdoors town is San Dimas?
Read from the map. The page puts what stands out first.
Outdoors grade
How much outdoors does San Dimas have?
On conserved land, trails, park land and how close residents live to a park, San Dimas is ahead of 98% of U.S. towns, #47 of 847 in California. All four inputs are above most U.S. towns; trail miles rank highest, the share of residents near a park lowest.
A+
OutdoorsA character grade: shown, never part of San Dimas’ overall grade.
Conserved land37% of the land · typical CA town 4% · U.S. 4%A+Trails2.9 miles of mapped trail per square mile of land (44 mi) · CA 0.9 · U.S. 0.4A+Park land66 acres of park per 1,000 residents (2,242 acres) · CA 5 · U.S. 13A−Parks close to home93% of residents within a half mile of a park · CA 91% · U.S. 72%A−
All U.S. towns we grade (21,298)Ahead of 98%
LessMore
California towns of 2,500+ (847)Ahead of 95%
How sure. Graded on any three of the four inputs instead, the letter would still be A+. Trails and many small parks come from OpenStreetMap, mapped by volunteers, so coverage varies from town to town; the half mile is a straight line from each census block, so a river or highway in the way isn’t counted against it.
PAD-US, OpenStreetMap (© OpenStreetMap contributors), Census 2025 Gazetteer and 2020 blocks; details in Sources below. How TownRatings grades the outdoors →
The map
Conserved land, trails & bike routes
Tap a number to zoom to a park. Tap a layer to hide it.
Easements protect land from building but are usually private.© OpenStreetMap contributors · USGS PAD-US
Places to walk
Pick a walk
The longest trail network is Frank G. Bonelli Regional Park, with 25.3 miles. Directions go to the nearest trailhead or public parking.
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
Horsethief Canyon Park
Park
108 acres2.5 mi of trail
Dog rules not recorded
Directionsto the parking lot
Walnut Creek Park
Park
52 acres1 mi of trail
Antonovich TrailAntonovich Oak Loop TrailAntonovich South Spur Trail
Dogs on leash
Directionsto the trailhead
All 14 parks & preserves
Frank G. Bonelli Regional Park1,784 acres · 25.3 mi of trail
DirectionsSan Gabriel Mountains National Monument1,204 acres · 3.7 mi of trail · United States Forest Service
Horsethief Canyon Park108 acres · 2.5 mi of trail
DirectionsSan Dimas Canyon Park53 acres · 1 mi of trail
DirectionsWalnut Creek Park52 acres · 1 mi of trail
DirectionsLone Hill Park9 acres · 0.4 mi of trail
DirectionsPioneer Park4 acres · 0.2 mi of trail
DirectionsAngeles National Forest1,284 acres · 0.1 mi of trail · United States Forest Service
Briggs Point Park1 acres · 0.1 mi of trail
DirectionsMarchant Park14 acres
DirectionsVia Verde Park8 acres
Ladera Serra Park4 acres
DirectionsCivic Center Park2 acres
DirectionsLoma Vista Park1 acres
Who protects it
3,526 conserved acres
37% of San Dimas’ land. Who manages San Dimas’s conserved land, from the USGS Protected Areas Database. Approximate, because parcels can overlap.
County1,984 ac
U.S. Forest Service1,258 ac
Town or city176 ac
Regional agency106 ac
Local Park · 2,088 acNational Forest · 1,258 acLocal Recreation Area · 94 acLocal Other or Unknown · 53 acLocal Conservation Area · 32 ac
The biggest protected parcels
| Parcel (PAD-US) | Managed by | Acres | Public access |
|---|---|---|---|
| Frank G Bonelli Regional Park Local Park | County | 1,809 | Open |
| Angeles National Forest National Forest | U.S. Forest Service | 1,248 | Open |
| San Dimas Canyon Community Regional Park Local Park | County | 129 | Open |
| Horsethief Canyon Park Local Park | Town or city | 110 | Open |
| San Dimas Canyon Golf Course Local Recreation Area | Regional agency | 87 | Restricted |
| Walnut Creek Wilderness Park Local Conservation Area | County | 32 | Open |
| SportsPlex Local Other or Unknown | Town or city | 22 | Open |
| San Dimas Wash Local Other or Unknown | Regional agency | 20 | Open |
| Marchant Park Local Park | Town or city | 10 | Open |
| Angeles Other National Forest | U.S. Forest Service | 10 | Open |
5 smaller protected places aren’t shown.
Things to do
35 places to go in San Dimas
Beaches, playgrounds, peaks, falls and more. Pick a kind.
Beaches in San Dimas
2 beaches without a name on the map. Tap “Show all on map” to see them.
Playgrounds in San Dimas
24 playgrounds without a name on the map.
Dog parks in San Dimas
San Dimas Dog ParkIn Horsethief Canyon Park
DirectionsBoat launches in San Dimas
4 boat launches without a name on the map.
Peaks in San Dimas
Johnstone Peak3,169 ft elevation · In San Gabriel Mountains National Monument
DirectionsWay Hill1,073 ft elevation
DirectionsPicnic areas in San Dimas
1 picnic area without a name on the map. Tap “Show all on map” to see it.
Community gardens in San Dimas
1 community garden without a name on the map.
Trails & water
13 named trails and 1 lakes & rivers
Named trails
Open to bikes · 19.3 miHorses · 15.9 miUnpaved · 4.4 mi
Bonelli Trail8.5 mi
Sycamore Flats Motorway2.3 mi
Park View Trail1.8 mi
Antonovich Trail1.6 mi
Lake View Trail1.4 mi
Johnstone Peak Truck Trail0.8 mi
Kikos Trail0.6 mi
Bluebird Motorway0.6 mi
Lower Bee Hive Trail0.4 mi
Vargus Trail0.3 mi
3 more trails
Tree Line Trail
0.3 miAntonovich Oak Loop Trail
0.2 miAntonovich South Spur Trail
0.2 miLakes & rivers tap for directions
Biking & sports
14 miles of bike routes
Bike lanes are often missing from the map in smaller towns, so that number is likely low.
9.6 mi
painted or protected bike lanes
4.3 mi
off-road bike paths
Bonelli TrailBike route
8.5 miPark View TrailBike route
1.8 miAntonovich TrailBike route
1.5 miTree Line TrailBike route
0.8 miCourts & fields
21Tennis
14Baseball
6Basketball
6Equestrian
1Football
1Skate park
Includes school and college facilities, which aren’t always open to the public.
History along the way
History →1 place on the National Register
The country’s official list of places worth saving (National Park Service). The map also marks 1 historic points from OpenStreetMap: plaques, memorials and old buildings.
San Dimas HotelBuilding · listed 1972
About itWhen to get out
The best walking months in San Dimas: April to June
NOAA’s 1991–2020 normals for the town and the daylight at its latitude. Outlined months have long days, highs of 59 to 86 °F and little rain for the place.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.1 | 10.9 | 11.9 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.3 | 11.3 | 10.3 | 9.9 |
| High (°F) | 67 | 68 | 71 | 75 | 78 | 84 | 90 | 92 | 89 | 81 | 74 | 67 |
| Rain (in) | 4.0 | 4.7 | 2.7 | 1.0 | 0.3 | 0.1 | 0.0 | 0.0 | 0.1 | 0.6 | 1.2 | 2.7 |
August is the driest month (under 0.1 in) and the warmest (highs of 92 °F). 4.7 inches fall in February, the wettest month. Summer highs reach 92 °F, too hot for the outline. The climate in San Dimas →
Next door
San Dimas and its neighbors
San Dimas has the most mapped trails of the 6 towns around it. Tap a town to see its outdoors.
| Town | Conserved of land | Trail mi per sq mi | Park acres per 1,000 | Near a park ½ mile | Outdoors |
|---|---|---|---|---|---|
| San Dimas | 37% | 2.9 | 66 | 93% | A+ |
| La Verne | 11% | 0.8 | 16 | 94% | A |
| Pomona | 3% | 0.3 | 2 | 94% | C+ |
| Covina | 2% | 0.6 | 2 | 86% | B− |
| Glendora | 33% | 1.3 | 26 | 85% | A |
| Charter Oak | 2% | 0.4 | 1 | 81% | C+ |
The four inputs of the Outdoors grade, from the engine; shares are of land, not water.
Questions about parks and trails in San Dimas
Where can I hike in San Dimas?
The longest trail networks: Frank G. Bonelli Regional Park, 25.3 miles; San Gabriel Mountains National Monument, 3.7 miles; Horsethief Canyon Park, 2.5 miles; San Dimas Canyon Park, 1 miles. Each one is on the map above, with directions to the nearest trailhead or parking.
How much of San Dimas is conserved land?
37% of its land, against a typical 4% for a California town and 4% nationally (PAD-US). Conserved doesn’t always mean open to visitors: easements are usually private land.
Are dogs allowed on San Dimas’ trails?
OpenStreetMap records dogs as welcome at Frank G. Bonelli Regional Park (on leash) and Walnut Creek Park (on leash). For the rest, check the signs at the trailhead.
Where can I bike in San Dimas?
14 miles of bike routes are on the map: 9.6 of painted or protected lanes and 4.3 of off-road paths. Named routes: Bonelli Trail, Park View Trail and Antonovich Trail.
Is there public land near San Dimas?
25,490 acres of parks and open public land lie inside San Dimas or within 10 miles of it (PAD-US), 2,328 of them inside the city line.
How much outdoors does San Dimas have?
Ahead of 98% of U.S. towns on the Outdoors grade, #47 of 847 in California. The grade combines the share of land that is conserved, miles of mapped trail per square mile of land, park acres per 1,000 residents and the share of residents within a half mile of a park. It’s a character grade, so it isn’t part of the overall grade. How it works.
Trail talk
Conditions, parking and favorite walks from San Dimas neighbors.
Share a tip
Sources
Where this page comes from
Conserved and public land: USGS Protected Areas Database of the United States (PAD-US), service updated July 2026. Parks, trails, playgrounds, beaches and other places: OpenStreetMap (© OpenStreetMap contributors, ODbL), map data as of 2026-10-28. Land and water area: Census 2025 Gazetteer. Residents near a park: 2020 Census blocks. National Register: National Park Service. How TownRatings grades the outdoors →