Purisima Creek

Midpen preserves cover the spectrum from redwood forests and chaparral-covered hillsides to sensitive wetlands along the San Francisco Bay. Ranging from 55 to over 18,000 acres, they are open to the public free of charge, 365 days a year, from dawn to one-half hour after sunset.

Open space preserves are generally kept in a natural condition in order to best protect the environment and wildlife habitat, and are developed with only the amenities needed to provide low-intensity recreation. Improvements may include paved or gravel parking areas, vault restrooms, signed trails for hiking, bicycling, and equestrian and dog use, and an occasional picnic table.


Find an open space preserve where you can hike, ride, walk the dog, and more. Discover your next adventure today.

New Visitors

New to Open Space? Here's what you'll need to know.
trail and poppies

Trail Use & Regulations

Preserve rules and regulations are for the protection of our visitors and natural resources, and to make everyone's visit a safe and enjoyable experience.
GeoPDF for mobile devices

Trail Maps & Apps

Midpen trail maps are now available in GeoPDF® format. Download our maps as a PDF to use on your mobile device, or print at home.
fallen tree on trail

Trail Conditions

Trail closures may change from day to day without notice, based on changing weather conditions, maintenance and other occurrences.Information is updated as needed when trails are opened or closed, or when there is scheduled trail maintenance.


Some activities on Midpen open space preserves require a use permit. Find out if you need a permit and how to apply.
hummingbird nest

Plants & Wildlife

Midpen open space preserves offer a great variety of environments, wildlife habitats, and plant life that be found.