Preserves | Sharing the Trails | Access Guidelines

Most of the District’s 220 miles of designated trails are unpaved “wildland” trails in steep, rugged terrain. Approximately 65% of these trails are “multiple use” trails and are open to bicyclists, which is the highest ratio of trails open to bikes among parks and open space in the Bay Area. Many of these trails are also single-track trails, providing bicyclists with a more technical experience.

Please Note: Activities may not be designated on all trails within the Preserve-- always refer to the map and trail signage for where the activity is permitted. Some trails are subject to seasonal closures, always check trail conditions and refer to signage.

Preserves open to mountain biking

Sixteen open space preserves are open to mountain biking († - all trails; *- designated trails only):

Sharing the Trails

The District offers low-intensity recreational use consistent with resource protection and preservation. Many different users are out on the trails exploring open space.

To help make multiple-use trails work, each user should keep in mind the needs of others. Bicyclists should always yield to all other trail users. On wide trails, slow down and pass with care. When encountering equestrians and hikers on narrow trails, make your presence known well in advance, particularly when approaching from behind. Stop and wait for them to pass or signal you through. Yield to other bicyclists traveling uphill.

Access Guidelines

  • Helmets: Bicyclists are required to wear helmets, even when riding uphill, that meet the standards of the United States Consumer Product Safety Commission Standard for bicycle helmets, or ANSI or Snell-approved bicycle helmets on all District lands. Helmet straps must be securely fastened when riding.
  • Speed limits: Control your speed at all times and obey the 15 mph speed limit (5 mph when passing or on blind turns). Racing and reckless riding are strictly prohibited.
  • Closed areas/off-trail use: Ride on designated trails only (those shown on District maps for bicycle use). Closed area or off-trail use, including straying off the trail for jumps, “wallrides,” and “woop-d-dos,” is strictly prohibited.
  • Electric bikes: Electric powered bicycles are NOT allowed, except for use by individuals with a mobility disability, and only on trails where bicycles are authorized. Other Power-Driven Mobility Devices Policy

Download Bicycle Access Guidelines