Foothills, Franco Ridge, Sugarloaf-Shell Ridge & Borges Ranch loop

You'll find multiple trailheads and street parking options conveniently located near downtown Walnut Creek. Borges Ranch, a notable feature along the route, also serves as a common access point with parking available.

The overall difficulty for mountain biking in Shell Ridge Open Space ranges from easy to intermediate. While some sections offer modest climbing on wide fire roads suitable for beginners, other parts of this loop, like the Sugarloaf-Shell Ridge Trail, involve more challenging climbs and descents with uneven terrain, rocks, and roots. It's best suited for riders with some experience.

Spring is an excellent time to visit, as the hillsides are lush and green. While creek crossings can be dry in late summer, the trail offers beautiful scenery year-round. Be mindful of potential heat in summer and muddy conditions after heavy winter rains.

Generally, there are no specific permits or entrance fees required for day use of the trails within Shell Ridge Open Space. However, as parts of this route are within the broader Diablo Foothills Regional Park, it's always a good idea to check the East Bay Regional Park District's official website for any updated regulations or specific fees that might apply to certain areas or activities.

The route features a diverse mix of terrain, including wide fire roads and singletrack trails, with both paved and unpaved sections. You'll encounter dirt, sand, and sometimes concrete surfaces, along with multiple creek crossings. Expect varied conditions, from smooth paths to areas with steep climbs, uneven ground, rocks, and roots.

This loop offers several points of interest. You'll pass by the historic Foothills Trail and Borges Ranch Trail junction, and likely near Borges Ranch itself, a working cattle ranch on the National Register of Historic Places. You'll also ride through areas with rewarding views from higher elevations, including near the Sugarloaf Hill Benchmark, and along trails like Ridgetop Trail and Sugarloaf-Shell Ridge Trail.

Yes, this route utilizes an extensive network of trails within Shell Ridge Open Space and connects to other regional paths. You'll ride sections of the Briones to Mt. Diablo Regional Trail, the Diablo Regional Trail, the Mokelumne Coast to Crest Trail, the Iron Horse Regional Trail, the Sugarloaf-Shell Ridge Trail, the Ridge Top Trail, the Franco Ridge Loop Trail, the Borges Ranch Trail, and the Foothills Trail, among others.

Yes, the trails in Shell Ridge Open Space are multi-use and shared with dog walkers. Please ensure your dog is on a leash and you practice courteous trail etiquette with other users, including hikers and equestrians.

The open space is home to various wildlife. Keep an eye out for birds like Meadowlarks and Western Bluebirds. The area's oak woodlands and grassy hillsides also support other local fauna.

Given the moderate difficulty and varied terrain, it's advisable to bring plenty of water, especially on warmer days, as water sources may not be readily available on the trail. Wear appropriate mountain biking gear, including a helmet, and consider carrying a basic repair kit for your bike. Sun protection is also recommended due to exposed sections.

The trails are multi-use, so you'll be sharing them with hikers, equestrians, and dog walkers. Bikes are officially permitted on paved and unpaved roads over eight feet in width. Always ride courteously, yield to other users, and respect trail signage.