Preserve, Promote, and Protect the Open Space The Conejo Open Space Foundation (COSF) is a 501(c)(3) nonprofit corporation formed in 1995 to promote, support and help maintain the open space and trail system of the Conejo Valley, and to educate visitors as to their roles as custodians and protectors of the open space and the environment. We support and help fund ongoing programs sponsored by the Conejo Open Space Conservation Agency (COSCA). We are funded through individual, business, and corporate donations and grants. Funds received by COSF are highly leveraged through the extensive use of unpaid community volunteers and other in-kind donations.

Educate We volunteer to protect and preserve our precious open space. One great way to do this is by educating the youth of our community. Interested in working with Conejo Valley fourth graders? Join us at our next Trails Education Days.

Fund Raise The Conejo Open Space Foundation raises funds for many outdoor projects, such as the bridge crossing in Hill Canyon, Bike Bells, and Trails Education Days. Support our efforts by making a donation on our Giving page.

Volunteer The Conejo open space wouldn't be the same without the hundreds of people who give their time and energy. The COSCA volunteer corps offers many ways to stay involved in the open space. Join us and make a difference today!

Upcoming Events Native Plantpalooza & Eco Fest Returns October 7, 2023 (9/13/2023) - On Saturday, October 7, the Conejo Open Space Foundation will host its second annual free event featuring dozens of eco-related exhibitors and fun activities for kids. Native Plantpalooza & Eco Fest will be held rain or shine at the Lakeside Pavilion area in the Conejo Creek North Park in Thousand Oaks from 9:00 a.m. to 2:00 p.m. The festival’s exhibitors include butterfly experts from Betina’s Butterfly Garden, noted wildflower painter and author Stacy Ruda Best, and many more. Exhibitors will have native plants and other eco-related goodies for sale, as well as plenty of freebies. Attendees can learn about water-wise,… (read more...) Conejo Fall Trail Work Day in Wildwood Park: October 21, 2023! (9/10/2023) - Please register in advance so we know how many people to prepare for! (read more...) News from COSF (View all the updates.) NPLD trail work at Rancho Potrero: What a success! (9/24/2023) - For National Public Lands Day on Sept. 23, about 40 people turned out to help clear weeds and invasive plants from the amphitheater and picnic area. This is where the old Olympia Farms was situated before COSCA created the Ranch Potrero Open Space Area. Some volunteers removed weeds from the amphitheater and picnic areas while other cut down fennel stalks… (read more...) 2023 Fall COSF Newsletter (9/19/2023) - The fall edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Native Plantpalooza & Eco Fest Returns Oct. 7 : Next monthly COSCA trail work day will be September 23 : Ranger Luis Jimenez Joins COSCA Team : Spotlight on John Noble : and more... View our Fall Conejo Open Space Newsletter. (read more...) It’s New Map Monday in Wildwood Park: Lizard Rock, Paradise Falls and Two Springs Loop (9/18/2023) - Highlights View of Wildwood Mesa, Elliott Mountain, Hawk Canyon and the Western Plateau from Lizard Rock Rugged volcanic rock on Stagecoach Bluff. The trail is a real challenge for mountain bikers; many use the much easier Mesa Trail instead Everybody loves to visit Paradise Falls Description This is a moderate 4.8 mile round trip route, with a total elevation gain/loss… (read more...) Barbara Welch is Our August ‘You in the Conejo’ Winner! (9/1/2023) - August's “You in the Conejo” winner is Barbara Welch, whose photo featured the challenge subject for August—a Conejo Open Space trail sign—plus a bonus lizard on said sign. (We're counting her including her hiking stick as a selfie,) Here’s a recap of the “You in the Conejo” rules: Each month in 2023, we’ll post the name of something that you… (read more...) It’s New Map Monday in Los Robles West: Rosewood Trail to Space Mountain Overlook (8/14/2023) - Highlights Great views of the city and open space from the "Space Mountain" Overlook From the optional segment to Angel Vista, you can see from Dos Vientos to the Channel Islands when the sky is clear Description This is a moderate 6.6 mile hike with an elevation gain/loss of about 1350 ft. The grades are gentle to moderate. The trails… (read more...) Christine Elowitt is Our July ‘You in the Conejo’ Winner! (8/1/2023) - Our newest “You in the Conejo” winner is Christine Elowitt, whose selfie featured the challenge subject for July—a cactus. In her case, it was a cholla cactus with a pretty bloom on itl.This.is Christine's second win: In February she won for.her selfie at Paradise Falls. Here’s a recap of the “You in the Conejo” rules: Each month in 2023, we’ll… (read more...) COSCA begins new volunteer program for monthly trail work (7/25/2023) - The Conejo Open Space Conservation Agency (COSCA) is expanding its community volunteer opportunities to include monthly events. The plan is to take on smaller projects with crews of 20 or so volunteers focused on trail building and maintenance. The expanded commitment to volunteer programs is made possible by the addition of four new rangers over the past year and a… (read more...) Water expert Jennifer Lancaster explains ‘weather whiplash’ phenomena –plus a recording of the presentation. (7/3/2023) - On June 28, Jennifer Lancaster, MS, appeared as COSF’s second guest in the 2023 Speaker Series as part of our special “Sustainability” theme. In “Water: Where it comes from, how we use it, where it goes—and why it matters” Lancaster, who is the principal resource specialist at the Calleguas Municipal Water District, discussed the challenges to water resources in the Conejo Valley.… (read more...)

Follow us on social media