Every trail guide for Las Trampas Wilderness Regional Preserve sends you the same way: take Crow Canyon Road west from I-680, turn onto Bollinger Canyon Road, and follow it to the main staging area. That route makes sense if you are driving in from somewhere else.
Stone Valley Oaks residents are not coming from somewhere else.
At the end of Hemme Avenue, at the edge of the neighborhood, sits the Ringtail Cat Staging Area. It does not appear as a primary entrance on most trail websites. There is no fee booth, no ranger kiosk. What it has is a small parking area, a trailhead sign, and 6,050 acres of wilderness on the other side.
That proximity is the specific thing about this neighborhood that does not appear in any neighborhood description.
The Entrance Nobody Talks About
Las Trampas has been called "the tough guy of the East Bay Regional Park District." The label holds up. The preserve covers more than 6,000 acres across two long, hilly ridges — Las Trampas Ridge on the east and Rocky Ridge on the west — flanking a narrow valley carved by Bollinger Creek. The terrain is steep, the chaparral is dense, and the elevation changes are real. This is not a manicured trail system.
The Bollinger Canyon entrance, on the San Ramon side, is where most visitors go. It is well-documented, well-trafficked, and easy to find from the freeway. For residents approaching from Stone Valley Oaks, it means getting in a car and driving around the outside of a preserve that is, from a different angle, already in the neighborhood.
The Ringtail Cat Staging Area on Hemme Avenue changes that geometry. The staging area sits at the terminus of a residential street in Alamo, and for households within walking distance, the trailhead is on foot. The preserve opens at 8 AM daily, with closing times that shift by season.
From the staging area, the Ringtail Cat Trail begins quietly. The first 0.4 mile is flat and shaded, winding through woods alongside a dry streambed. Past a cattle gate and a small wooden bridge, the trail branches, and the character of the preserve announces itself: a steep ascent through grassy hills dotted with blue oaks, with the path narrowing in places and diverging into multiple lines across the slope, all converging at the same point higher up. Long pants and sturdy shoes are practical rather than optional, particularly in drier months when loose gravel makes footing uncertain, and in wet months when the trail turns to mud.
What You Can Do From One Staging Area
The Hemme Avenue entrance connects to a network of 93 trails within Las Trampas, 72 of which are designated for mountain biking. The key routes accessible from this side of the preserve, and their access rules:
- Ringtail Cat Trail — Hikers and equestrians only, no bikes. The entry trail from this staging area. Steep sections after the initial flat stretch; narrow and overgrown in places, especially on the Corduroy Hills connector.
- Madrone Trail — Open to hikers, mountain bikers, and equestrians. Connects through the preserve's interior toward the ridge system.
- Las Trampas Ridge Trail — Open to hikers, mountain bikers, and equestrians on the multi-use portions. The ridge offers views of the Bay, San Francisco, Lake Chabot, and Mount Diablo. Bikes are restricted from the single-track segment; cyclists reaching Las Trampas Peak must use the Bollinger Canyon Trail uphill to the multi-use section.
- Corduroy Hills Trail — Hikers only, skirting Eagle Peak. Narrow and overgrown in sections; considered among the more demanding routes in the northern portion of the preserve.
- Rocky Ridge View Trail — Hikers only. Rocky Ridge tops out at 2,024 feet, with the broadest panoramic views in the preserve.
For a full day: the Ringtail Cat, Madrone, Las Trampas Ridge, and Corduroy Hills loop covers 7.8 miles with 1,978 feet of elevation gain and takes between four and seven hours to complete. That is serious hiking by any measure. The same trail network, taken in smaller pieces, produces a two-hour outing before breakfast.
The wildlife reflects the terrain. Deer, foxes, bobcats, raccoons, hawks, and the occasional golden eagle are all documented within the preserve. Cattle graze in the open grassland areas under a grazing lease with the East Bay Regional Park District — their presence is intentional, keeping the grass low during dry season to reduce fire risk. Encountering cattle on the trail is routine; approaching them is not recommended. Dogs are allowed on most trails, on leash.
Where the Trails Connect
Las Trampas does not end at its own boundaries. On the eastern edge of the preserve, a regional trail links it to the southwest corner of Mount Diablo State Park at Macedo Ranch Staging Area. The route shifts surfaces as it goes, moving through singletrack, fire road, and occasional sidewalk as it passes through open space areas and neighborhood edges. For anyone following the recent expansion of Mount Diablo State Park, this trail is the physical connection between the two systems.
Within the preserve, the Eugene O'Neill National Historic Site sits on Las Trampas's eastern boundary, enclosed on three sides by the wilderness land. The site is reachable by trail from within Las Trampas, or by single-lane road from Danville. Visitors who arrive on foot through the preserve do so without the standard crowds at the main entrance.
Inside the preserve itself, Kheystone Stables offers horse boarding and riding lessons for adults and children, adjacent to Las Trampas at the Bollinger Canyon staging area. Equestrian use of the preserve's multi-use trails is common, and the stables serve as a base for riders who want structured access to the system.
Two geological fault lines, the Las Trampas and Bollinger faults, run through the preserve and account for the sharp ridgelines and exposed rock formations. Several formations contain compressed layers of fossils. The Orinda formation holds remnants of ancient beach and shoreline; the El Sobrante formation is fossil-bearing; the Pinole Tuff is of volcanic origin. These are the rocks underfoot on the ridge trails.
The Other Half of the Network
Las Trampas is the demanding side. Alamo has a complementary system for daily use that runs in a completely different direction.
Hap McGee Ranch Park offers 16 acres of open parkland in Alamo, a reliable off-leash option depending on the designated areas, and easy access without elevation gain. The Alamo community maintains six public parks and sports fields in total. One of them hosts outdoor concerts on Friday evenings through the summer, a local tradition that tends to stay local.
The Iron Horse Regional Trail runs 32 miles along the former Southern Pacific railroad right-of-way from Concord to Pleasanton, passing through Alamo and Danville. The trail is paved, flat, and open to pedestrians and cyclists. As a dog-walking route it is distinct from Las Trampas in every way: wide, accessible, and busy on weekends. As a connection to downtown Danville to the south or Walnut Creek to the north without a car, it is consistently underused by people who have not tested it for that purpose.
Diablo Foothills Regional Park extends the open-space access on the eastern side of the neighborhood, toward the Mount Diablo foothills. The character there runs drier and more exposed than Las Trampas, with trail conditions that vary significantly by season.
The practical picture for Stone Valley Oaks residents is two distinct outdoor systems operating in different registers. The Iron Horse Trail and neighborhood parks handle daily walks, weekend rides, and low-effort outings. Las Trampas handles the rest: a 6,000-acre wilderness preserve that begins at the end of a residential street. Most neighborhoods near open space offer one of those things. This neighborhood offers both from the same address.
What makes the Hemme Avenue entrance specifically worth knowing is not the trail system itself. The trails are well-documented on the preserve side. What is less documented is the access point and what it means in practice: a neighborhood resident can walk to the trailhead, do a serious hike, and walk home. No staging. No drive. The wilderness is not a destination you travel to from Stone Valley Oaks. For most of the neighborhood, it is already there.
If you are weighing a move into this part of Alamo, or already live here and want to understand what the current market means for your home, Jill Fusari has been working this neighborhood from the inside for decades. Request a confidential home valuation to start the conversation.
