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 5:30 pm April through October, and 8 am to 4:30 pm November through March. For apple-related activities, visit the Riley's at Los Rios website: losriosrancho.com.


Group projects to contribute to the development and maintenance of the Preserve and Botanic Garden. These projects vary monthly and are suitable for individuals, families, and established groups. Volunteer days are held on the second Saturday of the month. Download the Activity Calendar for dates and times or contact the Preserve at oakglenpreserve@twc-ca.org.

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



Arts and Nature Festival

Spring 2020 | date to be announced this winter

An all-day celebration of nature, art, music, and dance. Enjoy free workshops, art exhibitions, crafts, and shop for original items created by local artists. Fun for all ages!


Online Program Calendar & Registration

All programs are offered at no charge to participants. Registration is required for certain programs. Please visit the online program calendar to register for specific programs.

Astronomy Nights
The San Bernardino Valley Amateur Astronomers visit the preserve with a variety of telescopes pointed at the night sky. You will have a change to take a closer look at planets, stars, nebulas, galaxies, and more! Program begins at 7:00 pm.

Behold the Beauty - Art In Nature
Using the beauty of nature to inspire the artist in everyone, we start with an art lecture followed by a hands-on art demonstration tailored to the ability and experience of each participant. Different mediums and techniques used each month. This program is offered the third Saturday from April through November at 1:30 pm.

Fun Unplugged
An outdoor adventure exploring our trails while participating in hands-on learning activities focused on science, nature, cultural history, or merely making new friends and having dun in an "old-fashioned" unplugged way. Programs begin at 6:00 pm.

Kids for Kids Hike
A guided hike lead by our Junior Rangers for a kid's eye view of the preserve followed by a nature-inspired craft. Programs are at 11:00 am.

Lectures and Workshops
We host a diverse range of lectures and workshops hosted by guest speakers and/or preserve staff. Programs begin at 11:00 am unless specified below. Please click on the program dates for more details. Registration required.

Night Walks
Explore the preserve at Night! Join our naturalists on a themed walk and talk on the Preserve trails. Night Walks are held the third Saturday of the month April through September from 7 to 9 pm, and from 5 to 7 pm in October and November. Ages 8 and older. Registration required.

Step Outside and Read (S.O.A.R.)
is a summer program featuring a craft, a nature activity, and story time featuring special guests from local libraries. Held every Thursday at 3:30 pm.

Wildflower Walks
Walk with Dr. Tim Krantz, Botanic Garden Director, through our Southern California Montane Botanic Garden to learn about the large variety of wildflowers found throughout the San Bernardino Mountains. Walks are offered at 10:00 am and 2:00 pm.

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. Program will start at 10:00 am and for ages 8 and above.