Conejo Open Space Foundation – Help us to support your local open space

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 memberships, 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 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!


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Latest Updates (View all the updates.)

Conejo Open Space Challenge photo gallery – First of many? (3/18/2023) - This is the first gallery of photos that were submitted by participants of the 2023 Conejo Open Space Challenge. They were all emailed to When traveling the trails, please keep the weather forecast in mind and stay home when they're still wet after recent rains! You can check this web page to see if any Conejo Valley trails have been closed.   (read more...)
2023 Spring COSF Newsletter (3/16/2023) - The spring edition of the Conejo Open Space Foundation newsletter has been posted. In this edition... Rainy Day Trail Etiquette for Us All : Don't Miss Our 'Trash Talk' on March 29 (via Zoom Video) : Audubon Grants Help You Lose the Lawn :  Spotlight on... Naomi Lin, a recipient of our $1000 scholarship for high school seniors going into environmental studies in college : and more... View the Spring Conejo Open Space Newsletter. (read more...)
Sustainability in the Conejo Valley – “Talkin’ Trash: How to Do Your Garbage Right” (3/11/2023) - On Wednesday, March 29, at 7:00 p.m., a panel of three local experts will discuss how residents can help reduce the amount of household waste that ends up in our landfills. Included will be discussions about state and local programs for reducing waste, recycling and the proper disposal of hazardous chemicals and items. After the presentations, there will be a Q & A session for attendees to ask about specific issues that hadn't already been covered. The expert panelists are: Amgen sustainability manager Joanie Burns Athens Services territory manager Matt Trouts City of Thousand Oaks Sustainability Dept. assistant analyst Philip… (read more...)
It’s New Map Monday in Los Robles East: White Horse Canyon, Los Robles and Brookview Trails Loop (3/6/2023) - Highlights 95% wide dirt roads Some good views of the Los Robles trail system, Thousand Oaks, lakes, and mountains White Horse Canyon Trail may be too steep for mountain bikers to enjoy climbing White Horse Canyon Trail is a of the segments of the 2023 Conejo Open Space Challenge, colored green on the map Description This moderate route includes diverse terrain including trails along the ridgeline, in the canyons, and along the hillsides. Being some distance from popular trailheads that have lots of parking, these trails are less used than other parts of the Los Robles Trail system. Key Statistics… (read more...)
Christine Elowitt is Our February “You in the Conejo” Winner! (3/1/2023) - February's "You in the Conejo" winner is Christine Elowitt, whose selfie featured her at what is arguably the most famous water attraction in all of COSCA property: Paradise Falls at Wildwood Regional Park. "Running water" was the challenge subject for February and we had many fun entries that showed off our springtime bounty in creeks, streams and lakes. You can check out some of the entries on Instagram or Facebook at the hashtag #youintheconejo. We're including a few here. And if you're new to this, here's a recap of the "You in the Conejo" rules: Each month in 2023, we’ll post… (read more...)
The 2023 Conejo Open Space Challenge starts March 1! (2/3/2023) - Here's your chance to explore some of the best trails in the Conejo Open Space that many people are not familiar with! From March 1st through May 31st the Conejo Open Space Conservation Agency (COSCA) is challenging mountain bikers, hikers, trail runners and equestrians of all ages to try out some trails that  may be new to them. See if you can complete all ten trails! If you do, you will be entered into a raffle and could win a prize donated by some awesome sponsors. View updates to the Challenge activities towards the bottom of this page, including galleries… (read more...)

Spring Trail Work Day is Cancelled! (3/14/2023) - Due to the amount of rain we're having this week, and more rain possible for next week, the work day scheduled for this Saturday, March 18, is cancelled. No alternative date is scheduled at this time. COSCA plans to review… (read more...)
It’s New Map Monday in Conejo Canyons: Hill Canyon to Elliott Mountain (1/30/2023) - Highlights Moderate hike of 5.2 miles with about 800' of climbing Mountain bikers will find the Outlaw Loop and Elliott Mtn. Trails a challenging climb. One of the segments of the 2023 Conejo Open Space Challenge Description This is… (read more...)
COSF’s Winter 2022 Newsletter is here! (1/11/2023) - The winter edition of our newsletter is now available! In this issue: Meet Your New COSCA Rangers Trail Savvy for New Bikers 'Where' Contest Returns as 'You in the Conejo' Plus: Spotlight on COSF board member Brendan Callahan How to… (read more...)
Repeat Winner: Randy Wagner Takes ‘Where in the Conejo’ Grand Prize Again! (12/23/2022) - This year, COSF’s popular “Where in the Conejo” monthly contest featured 12 trails or trailside phenomena, challenging contestants to identify them correctly. The previous year, we created a Grand Prize for whoever got the most answers correct. Randy Wagner of… (read more...)
It’s New Map Monday in North Ranch: Bowfield Trail to Three Peaks (12/5/2022) - Highlights A good intermediate workout with several options Climb up to three peaks (and one sub-peak), all with great views all around For an even great workout, continue on moderately steeper trails southwest on the Saddle Pass Trail or southeast… (read more...)
COSCA Fall Trailwork Day 2022 John Kross Wishbone Trail COSCA Fall Trail Work Day 2022 Fixes Up the Wishbone Trail (10/28/2022) - An enthusiastic crowd of 55 volunteers turned out early on a cool, overcast morning to work on the Wishbone Trail behind the Westlake Village Community Park on October 15. The trail, which was completed a mere three years ago and… (read more...)