Trail Building and Restoration

The COSCA system includes more than 170 miles of trails, and we’re helping COSCA make that number larger every year! During the Fall and Spring Trail Work Days, volunteers come out to help build new trails for everyone to enjoy. Sometimes we instead go out to repair trails that were damaged during severe winter weather. Local trail organizations the Santa Monica Mountains Trails Council (SMMTC) and the Concerned Off Road Mountain Bicyclists (CORBA) help COSCA Rangers plan the work and oversee the other volunteers. Groups including local businesses have their own volunteer work days as a way to give back to the community.

Our trail building and restoration activities rely on volunteers to help out! If you would like to see more and better trails, we hope you’ll want to pitch in!

Trail Work Coordinator: John Kross ( )

News about trail work events, future and past

Spring Trail Work Day is Cancelled! - 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...)
2023 Conejo Spring Trail Work Day will be Saturday March 18 - After all the rain we've had since January, our Conejo Valley trails are in dire need! You can help restore them by volunteering for the Conejo Spring Trail Work Day to be held in Wildwood Park on Saturday March 18.… (read more...)
Sage Publishling volunteers at Conejo Canyons Trailhead Newbury Park, CA with COSF and COSCA Sage Publishing Volunteers Clean Up the Conejo Canyons Trailhead - Nine volunteers from Sage Publishing joined COSF board members Anne and Tania and COSCA rangers Joe and Ryan to clean up the Conejo Canyons Trailhead in Newbury Park on October 20. A short walk from Sage’s offices on Conejo Spectrum… (read more...)
COSCA Fall Trailwork Day 2022 John Kross Wishbone Trail COSCA Fall Trail Work Day 2022 Fixes Up the Wishbone Trail - 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...)
Conejo Fall Trail Work Day will be Saturday October 15 - 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… (read more...)
Conejo Spring Trail Work Day – What a Success! - On Saturday March 19 about 130 volunteers came to help restore the Santa Rosa Trail above Wildwood Mesa to like-new condition! There were enough volunteers that crews also worked on the Teepee, Moonridge and Stagecoach Bluff Trails. The photos in… (read more...)
Conejo Spring Trail Work Day will be Saturday March 19 - For the first time since 2019, we'll be able to help fix up some of the Conejo Valley trails! Please pre-register at to save time on the morning of the event, and to get an email reminder a few… (read more...)
Canceled: COSCA Spring Trail Work Day, March 21, 2020 - A message from the Conejo Open Space Conservation Agency: Dear COSCA Trail Friends, In light of community concerns about the potential spread of Coronavirus Disease 2019 (COVID-19), and recommendations by health professionals to limit large gatherings, COSCA chosen to cancel… (read more...)
Announcing the COSCA Spring Trail Work Day, Saturday March 21, 2020 - This year volunteers will be meeting at the inner parking lot at Wildwood Park to help repair damage to the Santa Rosa Trail. 7:30 am: Meet at the inner (lower) lot for check-in at the registration table, complete a release… (read more...)
2019 Fall Trail Work Day, October 19, 2019 - About 80 open space enthusiasts came out to help fix up the trails in the Conejo Canyons in preparation for winter rains. Volunteers came from various organizations such as the Santa Monica Mountains Trails Council (SMMTC), the Concerned Off-Road Bicyclists… (read more...)