13 Miles Of Pure East Bay: The Ultimate Guide To The Las Trampas To Mt. Diablo Regional Trail
Are you ready to conquer the East Bay's most challenging and scenic connection? As of December 23, 2025, the Las Trampas to Mount Diablo Regional Trail remains one of the premier long-distance routes in Northern California, offering a rugged, 13-mile traverse between two of the region's most beloved parks. This trail is not just a hike; it's a demanding journey across the dramatic, rolling hills of the Diablo Range, connecting the dense wilderness of Las Trampas with the iconic peak of Mount Diablo. If you are training for an ultra-marathon, seeking unparalleled panoramic views, or simply looking for a full-day adventure, this regional trail should be at the top of your list.
The latest updates from the East Bay Regional Park District (EBRPD) confirm ongoing efforts to maintain and improve access, including recent RFPs for a "Southern Las Trampas Staging Area & Trails Project," ensuring the trail system remains a fresh and evolving challenge for hikers, trail runners, and mountain bikers alike.
Las Trampas to Mt. Diablo Regional Trail: Key Statistics and Profile
The Las Trampas to Mt. Diablo Regional Trail is a vital artery in the East Bay's extensive trail network, managed primarily by the East Bay Regional Park District (EBRPD) and connecting to lands overseen by California State Parks.
- Trail Name: Las Trampas to Mt. Diablo Regional Trail
- Managing Authority: East Bay Regional Park District (EBRPD)
- Trail Length (Total): Approximately 13 miles (one-way).
- Trail Ends: East edge of Las Trampas Regional Wilderness to the southwest corner of Mount Diablo State Park.
- Primary Activities: Hiking, Trail Running, Mountain Biking (restrictions may apply in certain areas).
- General Difficulty: Medium to Challenging. Sections are known for being steep and narrow.
- Elevation Profile: Features significant elevation gain and loss across the Diablo Range foothills. The terrain is rugged and requires good physical condition.
- Key Trail Segments: Includes portions of Madrone Trail, Del Amigo Trail, Trapline Trail, and sections of the Bollinger Canyon area.
The 5 Most Challenging and Rewarding Segments of the Trail
The 13-mile regional trail is a composite of several smaller trails, each offering unique challenges and incredible photo opportunities. Knowing these key segments is crucial for planning your trek.
1. The Las Trampas Ridge Ascent
Starting from the Las Trampas side, often near the main parking lot at the end of Bollinger Canyon Road, the ascent up to Las Trampas Ridge is a notorious lung-buster. This section quickly gains elevation, rewarding you with the first of many panoramic vistas. The trail here is often steep and exposed, making it critical to start early, especially during the warmer months.
2. The Madrone and Del Amigo Trails
As you traverse the wilderness, the Madrone Trail and Del Amigo Trail form key connectors. These segments are known for their gorgeous, sweeping views across the San Ramon Valley, with Mount Diablo dominating the eastern skyline. Keep an eye out for the unique sandstone formations and chaparral vegetation that define the Las Trampas geology.
3. Bollinger Canyon and Trapline Trail
The trail drops down into the Bollinger Canyon area along the Trapline Trail. This lower elevation section can be a muddy challenge, especially after the winter rains, where low spots and creek crossings hold water for extended periods. The canyon provides a brief, shaded respite before the final push toward Mount Diablo.
4. The Devil's Hole Box Canyon
A notable landmark in the Las Trampas area is the Devil's Hole, a fascinating box canyon and wind cave formation. While not directly on the main regional trail, it is a highly recommended side trip for those seeking to explore the park's interesting geology. The area features some of the most rugged and beautiful terrain in the preserve.
5. The Final Push to Mount Diablo State Park
The last segment is the connection to the Mount Diablo State Park boundary. This area offers views that stretch far beyond the immediate hills, including the entire San Francisco Bay, the Livermore Valley, and even the Sacramento River Delta on a clear day. The trail conditions here can be hard to follow, making a GPS or a reliable map a handy tool for navigation.
Trail Access, Safety, and Wildlife Alerts (2025 Updates)
Preparation is key for this long and challenging route. Always check the official East Bay Regional Park District (EBRPD) website for the most current trail status before you head out. For example, as of the current time, the Sycamore Trail in the vicinity has been temporarily closed due to a landslide.
Trailheads and Parking
There are several key access points, especially if you plan to hike a shorter section:
- Ringtail Cat Staging Area: Located at the end of Hemme Ave in Alamo. This is a popular starting point for the challenging Las Trampas Ridge loop.
- Hap Magee Park (Danville): Parking is available under I-680 near Hap Magee Park, providing easy access to the Danville side of the trail system.
- Las Trampas Parking Lot: Located at the end of Bollinger Canyon Road, offering the most direct access to the main Las Trampas trails.
Wildlife and Safety Protocols
The Las Trampas Regional Wilderness is a true wilderness area, home to a diverse array of California wildlife. Hikers must remain vigilant, especially for the presence of large mammals.
- Mountain Lions (Puma): There have been recent wildlife alerts for mountain lion sightings in the area. Always hike in groups, keep dogs on a leash, and know what to do in an encounter.
- Other Mammals: Keep a respectful distance from Black-tailed Deer, Bobcat, Gray Fox, Raccoons, Striped Skunk, Opossum, California Ground Squirrel, Feral Pig, and the elusive Ringtail Cat.
- Poison Oak: The trail system is known to have significant amounts of Poison Oak, particularly in shaded or overgrown areas. Learn to identify it and wear appropriate clothing.
Hiking and Trail Running Tips
The trail's "Medium" to "Challenging" rating is well-earned. The steep, rugged trails require proper footwear and sufficient water, particularly since the trail is often exposed to the sun. The East Bay Regional Park District hosts events like the 2026 Trails Challenge Hike, which often utilizes segments in the Las Trampas area, demonstrating the trail's status as a serious training ground.
Whether you're exploring the Corduroy Hills Trails, tackling the steep descents, or enjoying the views toward Suisun Bay, the Las Trampas to Mt. Diablo Regional Trail offers a profound connection to the raw, untamed beauty of the East Bay Hills. Plan your route, check the current conditions, and prepare for an unforgettable 13-mile trek.
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