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.)

Help Keep Our Trails Open! (3/24/2020) - A message from the Conejo Open Space Conservation Agency: Make everyone's safety a priority 1. Think First of staying home and avoiding others. We are in a health emergency rather than a holiday, and this is about saving lives. 2.… (read more...)
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...)

Where in the Conejo contest for March 27 (3/27/2020) - You could win $25 if you can you identify the trail in the photo! It’s a moderate 1.1 mile trail through a beautiful riparian woodland with about 520 feet of climbing. From the trailhead, it leads to a major east-west… (read more...)
A gallery of 2020 COS Challenge photos (3/26/2020) - These photos were submitted via Twitter and Instagram. Remember to maintain your appropriate social distance from other trail users while enjoying our open space during the coronavirus epidemic. Thanks to Twitter users RachelHKnight, seangreene89, Mirdear1, cmgrowell and Instagram users jesscdy,… (read more...)
2020 Spring COSF Newsletter (3/24/2020) - In this edition... Social Distancing on the trails : Spring flowers : Trail Trivia Alapay Trail : Harry Medved presentation on filming in the Conejo Valley : May 14 Guest Speaker Joey Algiers : Julia Osborn-Gourley : Spotlight on Steve… (read more...)
The March 13 Where in the Conejo Contest photo was of the bike park in Sapwi Trails Community Park (3/20/2020) - Congratulations to Steve Bacharach of Thousand Oaks who provided the correct answer and was selected as the winner. Thanks to all who responded! What is now the Sapwi Trails Community Park was originally planned to be a sports park with… (read more...)
The February 28 Where in the Conejo Contest photo was of the Los Robles East Trail, next to the Lily Tomlin table (3/6/2020) - Congratulations to Cindy Wagner of Thousand Oaks who provided the correct answer and was selected as the winner. Thanks to all who responded! This section of the Los Robles (East) Trail has the unofficial name of the Lily Tomlin Trail.… (read more...)
An enthusiastic audience loved Harry Medved’s talk (2/28/2020) - On Thursday night, we had a full house for Harry Medved's talk on movie filming in the Conejo Valley! Harry talked about dozens of movies that had been filmed in Thousand Oaks when it mostly consisted of ranchlands. Western movies,… (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!