Nestled mile-high in the foothills of the San Bernardino Mountains, within the historic farming community of Oak Glen, lies The Wildlands Conservancy’s Oak Glen Preserve. The 2,189-acre preserve is home to the Conservancy’s Southern California Montane Botanic Garden and Children’s Outdoor Discovery Center, and like TWC’s other preserves, is open to the public completely free of charge.

In 1996, The Wildlands Conservancy saved southern California’s largest historic apple ranch, Los Rios Rancho, from residential subdivision. The farm, surrounded by Oak Glen Preserve, is leased to third and fourth generation Oak Glen apple growers. Riley’s Frontier Events continues the property’s rich tradition of apple growing and historic entertainment.

In addition to the Botanic Garden, Discovery Center, and Los Rios Rancho, the Preserve includes prominent peaks: Wilshire (8,707 feet) and Galena (9,324 feet), both acquired by the Conservancy to prevent exploitation of private lands within the San Bernardino National Forest and to promote the expansion of the San Gorgonio Wilderness.

In 2012, TWC celebrated Los Rios Rancho's 5,000,000th visitor since it rescued the historic property from residential subdivision.

Conservation Outcomes

In referring to the largest apple ranch in Oak Glen, the Apple Growers Association has a saying: "So goes Los Rios, so goes Oak Glen!"


The Wildlands Conservancy rescued Los Rios Rancho when it was surrendered to a banker who marketed the ranch for residential subdivision.


TWC rescued Oak Glen a second time when the Los Angeles Department of Water and Power planned to condemn and shave off scenic peaks for 200-foot-tall, 500kv transmission towers. LADWP abandoned the project after TWC organized Oak Glen visitors to send over 50,000 postcards, letters and emails in protest.







Visitor opportunities include two public picnic areas and hiking trails that are open from 8 am to 4:30 pm (preserve gates close at 5 pm). For apple-related activities, visit the Riley's at Los Rios website: losriosrancho.com.


The preserve is located at the top of Oak Glen Road which has an off-ramp on Interstate 10 in Yucaipa. The trails and parks are open daily from 8 am to 4:30 pm. The gates to the preserve close at 5 pm. For information, call (909) 790-3698 or email oakglenpreserve@twc-ca.org.

39611 Oak Glen Road
Oak Glen, CA 92399
Get driving directions in Google Maps



Oak Glen Preserve 2016 Activity Calendar

Volunteer Day
Group projects to contribute to the development and maintenance of the Preserve trail system. These projects vary monthly and are suitable for individuals, families, and established groups. Volunteer days are held the second weekend of the month. Download the Activity Calendar for dates and times or contact the Preserve at oakglenpreserve@twc-ca.org. Ages 12 and up unless otherwise noted.

Behold the Beauty - Art In Nature
Using the beauty of nature to inspire the artist in everyone, we start with an observation hike followed by instructions on creating a work of art. Different mediums and techniques used each month. Instruction is tailored to the ability and experience of participants. Behold the Beauty is offered the third Saturday from March through November at 1:30 pm. All ages.

Night Walks
Explore Nature at Night! Join a TWC naturalist on a themed walk and talk on the Preserve trails. A different theme is presented monthly. Night Walks are held the third Saturday of the month April through October from 7 to 9 pm, and from 5 to 7 pm in November and December (No night walks January, February or March). Ages 10 and up.

Fun Unplugged held every Wednesday from June 15 through August 10 at 6 pm. Great for all ages.

S.O.A.R. Step Outside and Read held every Thursday from June 18 through August 6 at 3:30 pm. Great for all ages. Download the flyer here