The Chelmsford Open Space Stewardship is an independent group of volunteers working with the Town of Chelmsford. It was established in November 2005 by residents who enjoy hiking, being productive and doing things outdoors. While the town manages and protects open space property, the Stewards maintain and improve the trail systems within these open spaces – anything from picking up trash and keeping the trails free of fallen trees to replacing worn out bridges and kiosks. Stewards provide a daily presence and ongoing maintenance so these special properties can be enjoyed by all.

COSS has had an ongoing relationship with the Chelmsford Land Conservation Trust  and has members that are also members of the Chelsmford Land Conservation Trust.