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Rancho San Antonio County Park & Open Space Preserve



  • Directions

  • Size

    2430.35 acres


The 3,988-acre Open Space Preserve, combined with the adjoining 165-acre County Park, offers visitors a unique experience with a sampling of diverse environments, interesting cultural history and a variety of activities.

The preserve's extensive 24 miles of trails are available for exploration, whether one chooses to hike (dogs, however, are NOT permitted), bike, or horseback ride. Trails can be combined to form loops of different lengths and difficulties including the 3-mile Wildcat Loop Trail and the 4-mile Black Mountain Trail, To get to the northern part of the preserve from the valley floor, take the 2.1-mile Chamise Trail, which ascends gradually to a tranquil, secluded meadow in the Duveneck Windmill Pasture Area. This was once the location of a picturesque windmill from former ranch days when cattle freely roamed the hillsides. Visitors can now picnic amid fields of grass in the shadow of Monte Bello Ridge and Black Mountain. A major part of this area was a gift from Frank and Josephine Duveneck, and adjoins Hidden Villa Ranch, a non-profit environmental education facility.

A highlight of the preserve is Deer Hollow Farm, a working farm with a cow, pigs, goats, sheep, chickens, other animals, and an organic garden as well as numerous turn-of-the-century ranch buildings. An additional attraction is the restored Grant Cabin, furnished to represent living conditions in the late 1800s.

Bike and equestrian access are limited. Always refer to the trail map and trail signage for where the activity is permitted. Bicycles are not permitted west of Deer Hollow Farm.

Allowed Activities
Horseback Riding
Mountain Biking
Road Biking
Good For
Rules & Regulation
No Dogs
No Illegal Substances

Additional Information

Accessibility Description

Service road to Rogue Valley Trail - 1.4 mi.: From the county lot, the Permanente Creek Trail will lead you to the service road, which goes to Deer Hollow Farm and the Rogue Valley Trail.

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 NOT allowed in this Preserve. For information on dog-friendly preserves visit the Dog Access page. In accordance with the Americans with Disabilities Act, Midpen accommodates service dogs in Preserves wherever we allow public access.
  • 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.
  • Model Aircraft and Drones: Model aircraft are allowed within the designated flying area at Rancho San Antonio County Park, however drone use is not allowed in any District-managed area. Read more in Model Aircraft Rules.
  • 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.