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 > East Bay Regional Park District | Healthy Parks Healthy People > Parks > Las Trampas Regional Wilderness

Park Info

18012 Bollinger Canyon Road
San Ramon, CA 94583

Park Entrances
> Bollinger Staging Area/ Main Entrance
> Ringtail Cat Staging Area
> Elderberry Trailhead
> Bollinger Canyon Rd Equestrian Parking
> Chamise Trailhead

Phone Numbers
Toll Free: 888-EBPARKS (888-327-2757), option 3, extension 4537

Local Weather

Panorama Panorama

View Trail Map
Download PDF Map
Google Map
Transit & Trails

Park/Gate Hours
Jan. 1 - Feb. 13
  8 a.m. - 5:30 p.m.
Feb. 14 - March 8
  8 a.m. - 6 p.m.
March 8 - May 20
  8 a.m. - 7 p.m.
May 21 - Sept. 3
  8 a.m. - 8 p.m.
Sept. 4 - Nov. 1
  8 a.m. - 7 p.m.
Nov. 2 - Dec. 31
  8 a.m. - 5:30 p.m.

Park Events
Click HERE for upcoming events

Parking Fee
No fee

Dog Fee
No fee

Grazing Information
Grazing in the Parks

Camping Reservations
1-888-EBPARKS or 1-888-327-2757, press option 2

Picnic Reservations
Contact The Ranch at Little Hills at 925-837-8158 or visit

Emergency Number

EBRPD Headquarters
1-888-EBPARKS or 1-888-327-2757

Park Update

Visit Las Trampas and see the changing of the seasons. The black oak, black walnut, and big leaf maples are bursting with fall colors. The creek and waterfalls are coming to life ounce again with the winter rainstorms. Climb to the top of the Trampas Ridge or Rocky Ridge and your reward will be one of the best vistas of the Bay Area. On a clear day you can see the Farallon Islands from Rocky Ridge.

Trail Update
Bicyclists and horseback riders are not permitted on wet trails. Please take note that the water system at Las Trampas can be inconsistent at times, so make sure you bring enough water for you and your animals.

Grazing Update
Cattle have returned to the west side of Las Trampas Ridge. A small herd remains on the east side of Las Trampas Ridge. Cattle have returned to the Rocky Ridge grazing unit. Please close all gates to keep the cattle where they belong. If you notice any problems with the cattle, please cal 510-544-3276.

Las Trampas Regional Wilderness

Las Trampas Regional Wilderness

About The Park

Las Trampas Regional Wilderness offers 5,342 acres of wilderness and an expanded trail system that allows hikers and horseback riders to enjoy its remote and rugged areas. The park's size and terrain allow visitors a feeling of privacy and escape from urban hustle and bustle. Carry plenty of drinking water for yourself, your dog(s), and your horse(s) when visiting the park. The park's water supply is inconsistent and water may be unavailable at any time.

Wildflower Photo Guide

> Las Trampas (3.6 Mb, 11 x 8.5, 24 pages Acrobat PDF)

Submit Your Photos to the EBRPD Photo Pool

The Story of Las Trampas

If you are interested in learning more about Las Trampas write to: The Story of Las Trampas, East Bay Regional Park District, 2950 Peralta Oaks Court, P.O. Box 5381, Oakland, CA 94605-0381. Be sure to include your name and address plus a check or money order for $2.50, which covers the cost of printing and mailing the booklet.

Park Features


Two major Bay Area faults--the Las Trampas and Bollinger faults--account for the uplift and exposure of four well-defined geological formations. The Orinda formation holds remnants of ancient beach and shoreline; the El Sobrante formation consists of several fossil-bearing compressed rock layers; and the Pinole Tuff is of volcanic origin.

Little Hills Picnic Ranch

Adjacent to Las Trampas, this facility is available by reservation for group picnics of between 50 and 1,500 people. Facilities include a swimming pool, covered picnic areas, playfields and barbecue/picnic areas.
For information, call The Ranch at Little Hills at (925) 837-8158,

Las Trampas Stables

Las Trampas Stables offers horse boarding, riding lessons for children and adults, special equestrian events for groups, birthday parties, and day camps by reservation only.  Please call (925) 855-1570 for information and reservations.

The O'Neill National Historic Site

Owned and operated by the National Park Service, this site is open to the public by reservation. Call (925) 838-0249 for information.


The dominant woodland vegetation on the western and southern exposures of Las Trampas and Rocky ridges is black sage, chamise and buck brush. These are interspersed with toyon, hybrid manzanitas, elderberry, gooseberry, chaparral currant, sticky monkeyflower, coffeeberry, coyote bush, poison oak, hollyleaf red berry, deer weed and dozens of other species. There are some creek dogwood along Bollinger Creek.

The dominant trees are coast live oak and bay laurel. Other species are buckeye, big leaf maple, canyon live oak, black oak and scrub oak. The latter, with its mistletoe, seems to prefer the ridgetop habitat at the end of Chamise Trail. Half a dozen fern species are found in the park and there are large areas of grassland.

Animals and Birds

The park's abundant wildlife includes raccoons, foxes, opossums, bobcats, skunks and squirrels. Late in the day, with binoculars, you can count the deer in the hill areas adjacent to the parking lot. Las Trampas is Spanish for "The Traps" or "The Snares." According to Erwin G. Gudde's California Place Names, traps were once set in the chaparral of the hills to catch elk. Historical records also indicate that antelope and mountain lions were plentiful during the last century. Sightings of the big cats have been reported in recent years. There are many species of hawks, and golden eagles are occasionally sighted.

The East Bay Regional Park District leases some of the grassland areas for cattle grazing. Cattle keep the grass height down, which lessens the fire hazard during the dry season.

Park Activities

Hiking and Horseback Riding

The park is bisected by Bollinger Creek. To the west is Rocky Ridge, accessible from the parking lot via a paved road that brings hikers near the 2,024-foot summit. At the 1,760-foot elevation you can hike westward along a trail managed by the East Bay Municipal Utility District to the Valle Vista Staging Area on Canyon Road in Moraga, or south to the Chabot staging area in Castro Valley. A permit is required for hiking on EBMUD lands. Call 510-287-0459 for more information.

Stone outcroppings on Rocky Ridge are beautifully sculptured by the wind and colored by many lichen species. An entire day may be spent hiking the ridge and the Devil's Hole area. Wildflowers abound in season and are especially beautiful after a rain.

Las Trampas Ridge, reached via Chamise and Bollinger Creek Loop trails, is east of Bollinger Creek. The view from the ridge affords the sights of the Ygnacio, San Ramon and Amador valleys, Mt. Diablo, Carquinez Straits and other distant points of interest. The Corduroy Hills Trail, skirting Eagle Peak, is for hiking only, as are the Sycamore, Mahogany and Trapline trails. Boots are recommended. Park visitors should use only signed trails that appear on the map; trails that do not appear on the map are not maintained by Regional Park staff, and some may be in a sensitive resource area.


Near the parking lot are two picnic areas--Steelhead and Shady. Facilities are available on a first-come, first-served basis. The Little Hills Picnic Ranch is available for group picnics of between 50 and 1,000 people. For reservations, contact the The Ranch at Little Hills at (925) 837-8158, or visit their website at

Group Camping

The Corral Area is a reservable overnight group camp. Campers need to provide their own water. The park's water supply is inconsistent and water may be unavailable at any time. For information or reservations phone 1-888-EBPARKS or 1-888-327-2757, press option 2.


The park is a good place for birdwatching. There are many species of hawks, and golden eagles are occasionally sighted.


Bicycles may be ridden on designated bicycle trails, and on fire or service roads unless otherwise posted. No bicycles are allowed on Rocky Ridge View Trail.

ADA accessibility iconPark Accessibility

There are disabled parking, a wheelchair accessible chemical toilet, drinking fountain and picnic site at the Bollinger staging area.

Trail Accessibility Reports

To Reach The Park

From I-580 in Castro Valley, take Crow Canyon Road north to Bollinger Canyon Road. Turn left (north) onto Bollinger Canyon Road and follow it into the park. From I-680 in San Ramon, take Crow Canyon Road west to Bollinger Canyon Road, turn right (north) and follow it into the park.

Transit & Trails: Las Trampas Regional Wilderness (transit, biking, and walking directions) 

Trail Map

Click the map image below to see an enlarged version.

Las Trampas Trail Map

Directions for navigating the enlarged map:
When the enlarged version of the map opens click on the 'Full Expand' icon in the lower right hand corner of the map to see the 'Actual Size' map.

'Full Expand' icon > Full Expand

When the 'Actual Size' map is viewable, you can 'Click-Hold and Drag' the mouse button (left on a PC) to reposition the map, as desired.

'Single-Click' on the 'Enlarged' or 'Actual Size' map to return to the park page.