Help support your local open space

Helping to Preserve, Promote, and Protect Our 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 memberships, donations and grants. Funds received by COSF are highly leveraged through the extensive use of unpaid community volunteers and other in-kind donations.

Latest Updates (View all the updates.)

Get COSF news on your mobile device! (2/9/2020) - We post the most significant recent news to our home page, but it's even easier to keep up with all COSF news without having to visit our website. Using an app on your phone or tablet, our news will be… (read more...)
First speaker for the 2020 season on Feb 27th – Harry Medved: “CINEMA CONEJO: The Critical Role of Location Filming of Movies & TV in Our Community” (2/5/2020) - Join us for the kick-off to the COSF Speaker Series for 2020! In the early 20th century, the Conejo Valley and adjacent locations were quiet, unspoiled lands devoted to ranching and farming. Why did movie studios choose to come to… (read more...)

Feb 14 Where in the Conejo Contest photo was of Wildwood Canyon (2/21/2020) - The photo from our February 14th contest, shown here, was of Wildwood Canyon in Wildwood Park. Congratulations to Robert Angstadt who provided the correct answer and was selected as the winner. Thanks to all who responded! Learn more about the… (read more...)
Announcing the 2020 Conejo Open Space Challenge! (1/20/2020) - The 9th Annual Challenge runs March 1 – May 31, 2020 Here are the trails to explore for this year's Challenge (you can also download as a flyer): Lichen Trail Conejo Canyons Open Space Plateau Rim Trail Conejo Canyons El… (read more...)
COSCA has a new logo! (1/13/2020) - The Conejo Open Space Conservation Agency, COSCA, starts off the new year of 2020 with a brand new logo, shown to the right. The earlier one, below, dated to the time that COSCA was created in 1977. It has served… (read more...)
Ancient Conejo Open Space promotional videos (12/31/2019) - We found these old (and we mean – ancient!) videos kicking around. They’re so old that nobody remembers anything about them. Don’t try calling the on-screen phone number – we don’t know who it belongs to, if anyone. You can… (read more...)
2019 Winter COSF Newsletter (12/23/2019) - Happy Holidays : Trail Trivia - Shooting Star Trail : Holiday Party and COSF donation to New Hill Canyon Bridge : Spotlight on Christina Robertson : Free Hikes : Tarantula Hill : Old Hill Canyon Bridge restored : Non-native Plants… (read more...)
2019 Fall Trail Work Day, October 19, 2019 (10/19/2019) - About 80 open space enthusiasts came out to help fix up the trails in the Conejo Canyons in preparation for winter rains. Volunteers came from various organizations such as the Santa Monica Mountains Trails Council (SMMTC), the Concerned Off-Road Bicyclists… (read more...)


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 becoming a member or making a donation at our Membership 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!