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Sierra Azul Open Space Preserve



  • Directions

  • Size

    6713.44 acres

Contact Information


Just south of the Town of Los Gatos, on the east side of the Lexington Reservoir, sits Sierra Azul, the District's southernmost open space preserve. Translated Sierra Azul means "Blue Range." Encompassing more than 18,000 acres, this is the District's largest Preserve. Sierra Azul Preserve is a true wilderness area, yet surprisingly close to the urban areas of the South Bay, making it a popular destination.

Because of its size, Sierra Azul is divided into four areas: Kennedy Limekiln, Mount Umunhum, Cathedral Oaks, and Rancho do Guadalupe.

Dog, Bike, and Equestrian Access Limited: 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.

Allowed Activities
Mountain Biking
Horseback Riding
Dog Walking
Good For
Rules & Regulation
Dogs Permitted
No Illegal Substances
Dogs On Leash
No E Bikes

Additional Information

Accessibility Description

Mount Umunhum Summit pathways • 0.3 mi.: Enjoy breathtaking 360-degree views of our region, including San Francisco, Monterey Bay, the Pacific Ocean, and sometimes even the Sierras from ADA-accessible viewpoints. Accessible parking, restrooms, shade shelters, and pathways are located at the Mount Umunhum Summit.

Visit the Easy Access Opportunities page for additional information.


  • Hours: Open half an hour before sunrise to half an hour after sunset.
  • Dogs: Dogs are allowed only on designated trails in this Preserve. Must be controlled on a maximum 6-foot leash at all times. Dogs are allowed only in designated preserves or areas as posted. Dog walkers are required to bag and remove all dog waste from the Preserve by packing it out. Moving dog waste off trail is not permitted.  In accordance with the Americans with Disabilities Act, Midpen accommodates service dogs in Preserves wherever we allow public access. For more information visit the Dog Access page.
  • Bicyclists: Bikes are allowed on designated trails in this Preserve. Helmets are required for all riders at all times. Please observe the 15-mph trail speed limit (5-mph when passing or approaching blind turns). For more information visit the Bicycle Access page.
  • Equestrians: Horses are allowed on designated trails in this Preserve. Helmets are recommended for all equestrians. For more information visit the Equestrian Access page.
  • Groups: For safety reasons, permits are required for all groups of 20 or more people.
  • Permits: A use permit is required for any activity or event which: may be attended by twenty (20) or more people; OR is advertised or noticed in any publication, poster, electronic posting or flyer; OR requests/requires a fee be paid for participation. Visit the Permit page for more information.
  • Fires: Fires are prohibited on preserves.
  • Smoking: Smoking is prohibited on preserves.
  • Weapons: Weapons of any kind are prohibited on preserves.
  • Plants and Animals: Please leave plants and animals undisturbed. This not only preserves the natural environment, but is also a safety precaution.
  • Water Areas: Swimming wading, or engaging in any water-contact activity in any water areas of the District is prohibited.