Conejo Open Space Foundation
The Conejo Open Space Foundation is dedicated to helping preserve, promote and protect natural open space through community education and involvement. We support these efforts by fundraising and volunteer engagement.
2025: 30 years of connecting community and nature!
Upcoming Events
New Speaker Series talk: Ellie Bolas presents “Lions and Fires and Humans, Oh Deer!” (6/13/2025) - Please join us for the live online presentation of "Lions and Fires and Humans, Oh Deer!" by ecologist Ellie Bolas. Currently a PhD candidate at the University of California Davis (UCD), Bolas will discuss how mule deer in the Santa Monica Mountains and Conejo Valley navigate a dynamic landscape of risks and rewards. Bolas's research in partnership with the National Park Service and California Department of Fish and Wildlife examines mountain lion and mule deer behavior, spatial ecology and predator-prey interactions relative to wildfire and humans. Bolas has been involved in wildlife research and conservation for almost 15 years. In… (read more...)
The 2025 Conejo Open Space Challenge ends on May 31! (5/28/2025) - There are only a few days left until The Challenge ends this Saturday! That means there's still time to check out two or three trails if you're almost finished, or to cram in all ten if you haven't started. Here are some more great photos submitted by the participants. Over time, you'll notice there's more and more mustard next to the trails. If you would like to join the fun, check out the details on our Conejo Open Space Challenge page! (read more...)
News from COSF (View all the updates.)
Update on COSF’s 2025 Eco Scholarship Award (6/15/2025) - Isabella Lee is COSF's new 2025 Environmental Studies scholar. Isabella, who graduated from Thousand Oaks High School, replaces Greceldy Hau as the recipient of one of COSF's two scholarship awards because Greceldy will be pursuing a college major other than environmental studies. Isabella says that her determination to work toward a professional role in mitigating climate change stems from her… (read more...)
The 2025 Trails Education Days writing contest winners; the 2026 event will be April 20 – 23 (6/13/2025) - The 2025 Trails Education Days provided lessons on open space for 1,080 Conejo 4th grade students from all 17 CVUSD elementary schools during the week of April 28. Writing Contest The students who participate in Trails Education Days are invited to enter a letter-writing contest to describe some of the things they learned during their Trails Education Days experience. Two winners from… (read more...)
Watch the video of an Amgen volunteer team haul one ton of trash out of the Arroyo Conejo (5/25/2025) - On May 2, an enthusiastic team of 15 Amgen staffers joined COSCA Rangers Joe and Kari and COSF President Bill Miller and board member Anne Russell for a morning clean-up at the Arroyo Conejo. The video of the work can be seen below. The Amgen group removed about one ton of garbage that included cans and bottles, bicycle parts, gardening… (read more...)
You have just 3 weeks to complete the Conejo Open Space Challenge for 2025! (5/9/2025) - The COS Challenge ends on May 31, a date that is rapidly approaching! Already several dozen people have completed all ten trails. If you would like to qualify for some of the fabulous prizes supplied by the Conejo Open Space Foundation, and Giant Bikes, at the final celebration on June 6, you should put on your hiking boots or riding… (read more...)
2025 Spring COSF Newsletter (4/27/2025) - The spring edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Environmental Studies Scholarship Winners : New Threat to Conejo Oaks : Neighborhood Coyotes : CRPD Superintendent Matt Kouba Retires (photo at right) : Winter Photo Contest Winner : And More! View our Spring Conejo Open Space Newsletter. (read more...)
Third photo gallery from the 2025 Conejo Open Space Challenge (4/23/2025) - There are 5 weeks left in the 2025 Conejo Open Space Challenge. That's plenty of time to get out and explore the 10 Challenge trails, even if you haven't started yet. The great photos are continuing to roll in! Here are some more of them. If you would like to join the fun, check out the details on our Conejo… (read more...)
Forest expert Kim Corella discusses new threat to our Conejo Valley oaks—see her recorded presentation (4/21/2025) - Kim Corella, who is Cal Fire's Forest Pathologist with the Forest Entomology and Pathology Program for Southern California, addressed what could be a slow-moving disaster for our Coast Live Oaks in her Speaker Series talk "Oaks in Peril" on April 16. Having served with Cal Fire for the past 17 years, Corella has witnessed the goldspotted oak borer's path of… (read more...)
Another photo gallery from the 2025 Conejo Open Space Challenge (4/15/2025) - We're now exactly half way through the 2025 Challenge! Here are some more great photos submitted by the enthusiastic participants. If you would like to join the fun, check out the details on our Conejo Open Space Challenge page! (read more...)
New Speaker Series talk: Ellie Bolas presents “Lions and Fires and Humans, Oh Deer!” (6/13/2025) - Please join us for the live online presentation of "Lions and Fires and Humans, Oh Deer!" by ecologist Ellie Bolas. Currently a PhD candidate at the University of California Davis (UCD), Bolas will discuss how mule deer in the Santa Monica Mountains and Conejo Valley navigate a dynamic landscape of risks and rewards. Bolas's research in partnership with the National Park Service and California Department of Fish and Wildlife examines mountain lion and mule deer behavior, spatial ecology and predator-prey interactions relative to wildfire and humans. Bolas has been involved in wildlife research and conservation for almost 15 years. In… (read more...) The 2025 Conejo Open Space Challenge ends on May 31! (5/28/2025) - There are only a few days left until The Challenge ends this Saturday! That means there's still time to check out two or three trails if you're almost finished, or to cram in all ten if you haven't started. Here are some more great photos submitted by the participants. Over time, you'll notice there's more and more mustard next to the trails. If you would like to join the fun, check out the details on our Conejo Open Space Challenge page! (read more...) Update on COSF’s 2025 Eco Scholarship Award (6/15/2025) - Isabella Lee is COSF's new 2025 Environmental Studies scholar. Isabella, who graduated from Thousand Oaks High School, replaces Greceldy Hau as the recipient of one of COSF's two scholarship awards because Greceldy will be pursuing a college major other than environmental studies. Isabella says that her determination to work toward a professional role in mitigating climate change stems from her… (read more...) The 2025 Trails Education Days writing contest winners; the 2026 event will be April 20 – 23 (6/13/2025) - The 2025 Trails Education Days provided lessons on open space for 1,080 Conejo 4th grade students from all 17 CVUSD elementary schools during the week of April 28. Writing Contest The students who participate in Trails Education Days are invited to enter a letter-writing contest to describe some of the things they learned during their Trails Education Days experience. Two winners from… (read more...) Watch the video of an Amgen volunteer team haul one ton of trash out of the Arroyo Conejo (5/25/2025) - On May 2, an enthusiastic team of 15 Amgen staffers joined COSCA Rangers Joe and Kari and COSF President Bill Miller and board member Anne Russell for a morning clean-up at the Arroyo Conejo. The video of the work can be seen below. The Amgen group removed about one ton of garbage that included cans and bottles, bicycle parts, gardening… (read more...) You have just 3 weeks to complete the Conejo Open Space Challenge for 2025! (5/9/2025) - The COS Challenge ends on May 31, a date that is rapidly approaching! Already several dozen people have completed all ten trails. If you would like to qualify for some of the fabulous prizes supplied by the Conejo Open Space Foundation, and Giant Bikes, at the final celebration on June 6, you should put on your hiking boots or riding… (read more...) 2025 Spring COSF Newsletter (4/27/2025) - The spring edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Environmental Studies Scholarship Winners : New Threat to Conejo Oaks : Neighborhood Coyotes : CRPD Superintendent Matt Kouba Retires (photo at right) : Winter Photo Contest Winner : And More! View our Spring Conejo Open Space Newsletter. (read more...) Third photo gallery from the 2025 Conejo Open Space Challenge (4/23/2025) - There are 5 weeks left in the 2025 Conejo Open Space Challenge. That's plenty of time to get out and explore the 10 Challenge trails, even if you haven't started yet. The great photos are continuing to roll in! Here are some more of them. If you would like to join the fun, check out the details on our Conejo… (read more...) Forest expert Kim Corella discusses new threat to our Conejo Valley oaks—see her recorded presentation (4/21/2025) - Kim Corella, who is Cal Fire's Forest Pathologist with the Forest Entomology and Pathology Program for Southern California, addressed what could be a slow-moving disaster for our Coast Live Oaks in her Speaker Series talk "Oaks in Peril" on April 16. Having served with Cal Fire for the past 17 years, Corella has witnessed the goldspotted oak borer's path of… (read more...) Another photo gallery from the 2025 Conejo Open Space Challenge (4/15/2025) - We're now exactly half way through the 2025 Challenge! Here are some more great photos submitted by the enthusiastic participants. If you would like to join the fun, check out the details on our Conejo Open Space Challenge page! (read more...)Follow us on social media
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