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
CANCELED due to the Weather: November 22 Trail Work; Photos from September’s work (11/15/2025) - CANCELED due to the weather: November 22 Trail Work. The following text is from the original announcement. Join the COSCA rangers and other enthusiastic volunteers on November 22 to help fix up the Park View Trail above Dos Vientos Community Park! If you’re looking for for some ways to get exercise and expend some calories ahead of the holiday feasting season, this is your ticket. And get credit towards scoring a swanky TeamConejo volunteer T-shirt (details below). The work will be adjacent to Dos Vientos Community Park, fixing ruts, restoring native vegetation and cutting back weeds. Monthly work days are… (read more...)
News from COSF (View all the updates.)
It’s New Map Monday: Reino Road to Twin Ponds in Dos Vientos (11/17/2025) - Highlights This route is 8.0 miles long with about 1300' of elevation gain. There will be waterfowl in the Twin Ponds if there was a enough rain during the preceding winter to keep the ponds from drying up. The view is constantly changing on these hilly trails, overlooking Dos Vientos for much of the way, but also overlooking Long Grade… (read more...)
2025 Fall COSF Newsletter (9/16/2025) - The fall edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Announcing Plantpalooza 2025 - October 11 : New COSCA ranger Will Haver : Summary of speaker event "Lions and fires and humans, Oh deer!" : Focus on Robin Bertolucci, our newest board member : and Much More! View our Fall Conejo Open Space Newsletter. (read more...)
Summer ‘Four Seasons’ photo contest winner is Mike Moessl—again! (9/1/2025) - Congratulations are due once again to Mike Moessl, who submitted this photo of a sunrise seen from the Lang Ranch Open Space for our Summer "Four Seasons" photo contest. Mike also won the Spring wildflower challenge with his photo of woolly blue curls. For Autumn 'Four Seasons' contest our challenge subject is the Conejo Valley's iconic oak trees. Deadline for entry is… (read more...)
Wildlife researcher Ellie Bolas reveals the private lives of local mule deer—see her recorded presentation (7/31/2025) - Visit China Flat, Conejo Canyons, Rancho Sierra Vista or Satwiwa as the sun is rising. Watch in anticipation as it casts delicate morning light on the open canopy of the oak savanna, the frosted tips of wild oats and desiccated sagebrush—and wait. You just might see the unmistakable glimmer of a mule deer’s summer coat. “I’ll often bring my binoculars,… (read more...)
Spring ‘Four Seasons’ photo contest winner is Mike Moessl (6/29/2025) - Congratulation to Mike Moessl, who submitted this photo of woolly blue curls that he took in the Lang Ranch Open Space! Photo challenge for the Summer "Four Seasons" contest is sunrises and sunsets as seen from the Conejo Open Spaces. If you would like to enter future contests, here are the rules: Every season, we’ll identify a specific item (e.g.,… (read more...)
2025 Summer COSF Newsletter (6/20/2025) - The summer edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Grade 4 Trails Education Days summary and essay contest winners : Conejo Open Space Challenge wrap-up : Beware the goldspotted oak borer : Newest COSF board member Jessica Minucci : Spring photo contest winner : and much more! View our Summer Conejo Open Space… (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...)
CANCELED due to the Weather: November 22 Trail Work; Photos from September’s work (11/15/2025) - CANCELED due to the weather: November 22 Trail Work. The following text is from the original announcement. Join the COSCA rangers and other enthusiastic volunteers on November 22 to help fix up the Park View Trail above Dos Vientos Community Park! If you’re looking for for some ways to get exercise and expend some calories ahead of the holiday feasting season, this is your ticket. And get credit towards scoring a swanky TeamConejo volunteer T-shirt (details below). The work will be adjacent to Dos Vientos Community Park, fixing ruts, restoring native vegetation and cutting back weeds. Monthly work days are… (read more...) It’s New Map Monday: Reino Road to Twin Ponds in Dos Vientos (11/17/2025) - Highlights This route is 8.0 miles long with about 1300' of elevation gain. There will be waterfowl in the Twin Ponds if there was a enough rain during the preceding winter to keep the ponds from drying up. The view is constantly changing on these hilly trails, overlooking Dos Vientos for much of the way, but also overlooking Long Grade… (read more...) 2025 Fall COSF Newsletter (9/16/2025) - The fall edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Announcing Plantpalooza 2025 - October 11 : New COSCA ranger Will Haver : Summary of speaker event "Lions and fires and humans, Oh deer!" : Focus on Robin Bertolucci, our newest board member : and Much More! View our Fall Conejo Open Space Newsletter. (read more...) Summer ‘Four Seasons’ photo contest winner is Mike Moessl—again! (9/1/2025) - Congratulations are due once again to Mike Moessl, who submitted this photo of a sunrise seen from the Lang Ranch Open Space for our Summer "Four Seasons" photo contest. Mike also won the Spring wildflower challenge with his photo of woolly blue curls. For Autumn 'Four Seasons' contest our challenge subject is the Conejo Valley's iconic oak trees. Deadline for entry is… (read more...) Wildlife researcher Ellie Bolas reveals the private lives of local mule deer—see her recorded presentation (7/31/2025) - Visit China Flat, Conejo Canyons, Rancho Sierra Vista or Satwiwa as the sun is rising. Watch in anticipation as it casts delicate morning light on the open canopy of the oak savanna, the frosted tips of wild oats and desiccated sagebrush—and wait. You just might see the unmistakable glimmer of a mule deer’s summer coat. “I’ll often bring my binoculars,… (read more...) Spring ‘Four Seasons’ photo contest winner is Mike Moessl (6/29/2025) - Congratulation to Mike Moessl, who submitted this photo of woolly blue curls that he took in the Lang Ranch Open Space! Photo challenge for the Summer "Four Seasons" contest is sunrises and sunsets as seen from the Conejo Open Spaces. If you would like to enter future contests, here are the rules: Every season, we’ll identify a specific item (e.g.,… (read more...) 2025 Summer COSF Newsletter (6/20/2025) - The summer edition of the Conejo Open Space Foundation newsletter has been posted. In this edition… Grade 4 Trails Education Days summary and essay contest winners : Conejo Open Space Challenge wrap-up : Beware the goldspotted oak borer : Newest COSF board member Jessica Minucci : Spring photo contest winner : and much more! View our Summer Conejo Open Space… (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...)Follow us on social media
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