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 Fall Trail Work Day will be Saturday October 15 (9/19/2022) - Please join us to help fix up the Wishbone Trail on Saturday, October 15 for the Conejo Fall Trail Work Day. You will be amazed at how much can be accomplished in a few hours by volunteers! No experience is needed; COSCA Rangers and other experienced crew leaders will provide hand tools and instructions on how to use them safely and effectively. At noon, volunteers will be treated to a thank-you lunch and prize drawings! Register in advance to save time at the event and to receive a helpful email reminder a few days beforehand. 7:30 am: Meet at the… (read more...)
Native bumblebee on bladderpod flower Come Visit COSF’s Family-friendly Native Plantpalooza & Eco Fest October 1! (9/18/2022) - This free educational event with dozens of eco-related exhibitors will have lots of fun activities for the kids! Hosted by the Conejo Open Space Foundation on Saturday October 1, it will take place in Thousand Oaks at the Lakeside Pavilion area of the Conejo Creek North Park, from 9:00 a.m. to 2:00 p.m. The first-time festival’s over 20 exhibitors include butterfly experts from Betina’s Little Farm and Butterfly Garden, beekeepers from the Los Angeles County Beekeeping Association, noted wildflower painter and author Stacy Ruda Best, the garden clubs of Westlake Village and Conejo Valley, Poison Free Conejo, REI and many… (read more...)
2022 Autumn COSF Newsletter (9/17/2022) - The fall edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Native Plantpalooza & Eco Fest on Oct. 1 : COSCA Fall Trail Work Day Oct. 15 at Westlake Village Community Park : Agoura HOA Conducts Poison-free Study : COSCA Rangers Make Move to New HQ : Spotlight on COSF board member Bill Miller : and more... View the Autumn Conejo Open Space Newsletter. (read more...)
It’s New Map Monday: Los Robles East – Triunfo Bobcat Loop (9/12/2022) - Highlights Great view over Westlake Village, especially in the autumn when the trees are changing color A mix of trail types – singletrack trails and dirt roads Description This is moderate hike of about 4.25 miles with about 1000’ of climbing in total. The route starts in Triunfo Community Park, climbing the singletrack Triunfo Canyon Trail to the Los Robles Trail (East). It loops around the Bobcat Trail, returning on the Los Robles Trail (East), then taking a slightly different route along the top half of the Brookview Trail. There’s a bench on a rise at the top of the… (read more...)
Congratulations Maryann Thomas for winning the September ‘Where in the Conejo’ photo contest! (9/8/2022) - The September 1 Where in the Conejo contest photo was of the Triunfo Canyon Trail. Of the correct entrants, Maryann was selected at random as the winner of a $25 gift certificate. Congratulations and thanks to all who entered the contest! The Triunfo Canyon Trail leads from Triunfo Community Park up to the Los Robles Trail, near the east end. It is a very popular trail with hikers and mountain bikers, in part because it provides access to a number of trails in the Los Robles and adjacent open space areas. Triunfo Community Park has ample parking and bathrooms, an… (read more...)
California Clean Air Day is October 5; Take the Clean Air Pledge! (8/28/2022) - California suffers from some of the worst air quality in the country. Collectively we have the power to change the world and can choose to do so in ways that help, not harm, all Californians. Join us in challenging yourself to create clean air in your community. The Clean Air Pledge includes the most common things an individual can do to clear the air. COSF's Native Plantpalooza & Eco Fest takes place in the same week as California Clean Air Day, an annual event that draws attention to ways that companies, individuals and families can improve air quality. Coincidentally, exhibitors… (read more...)

It’s New Map Monday: Moonridge Trail, Paradise Falls, Two Springs Trail Loop from Wildflower Playfield Tennis Courts (8/15/2022) - Highlights This is the prettiest way to get to the very popular 40' high Paradise Falls Enjoy the beauty and tranquility of Wildwood Canyon away from crowds and dusty parking Easy short 2.9-mile loop along pretty canyon trails Two Springs… (read more...)
Insect activity on flower cluster Alicia Di Rado is the winner of the August ‘Where in the Conejo’ photo contest! (8/8/2022) -   The August 1 "Where in the Conejo" contest photo featured a hairstreak butterfly feeding on buckwheat flowers while a bee assassin captured a honeybee. Of the correct entrants, Alicia Di Rado was selected at random as the winner of… (read more...)
Monarch butterflies now listed as endangered: What we can all do to help them (7/25/2022) - The migratory monarch butterfly has been added to the endangered species 'Red List' by the International Union for the Conservation of Nature in mid-July 2022. This colorful butterfly is known for its spectacular migration of up to 2,500 miles from… (read more...)
Christine Elowitt is the winner of the July ‘Where in the Conejo’ photo contest! (7/8/2022) - The July 1 Where in the Conejo contest photo was of the Santa Rosa Trail in Wildwood Park. Of the correct entrants, Christine was selected at random as the winner of a $25 gift certificate. Congratulations Christine and thanks to… (read more...)
It’s New Map Monday! Los Robles East, White Horse Canyon, Los Padres Figure Eight Loop (6/20/2022) - Highlights Beautiful oak forest at the bottom of Los Padres Trail Great views of Thousand Oaks and more from Los Robles Overlook More remote White Horse Canyon and Brookview Trails have few visitors and great views Description This is a… (read more...)
2022 Summer COSF Newsletter (6/16/2022) - The Summer edition of the Conejo Open Space Foundation newsletter has been posted. In this edition…Environmental studies scholarship winners : The "Monarch Miracle" report on our latest speaker and video recording : Trails Education Days for 4th grade students are… (read more...)