- Abraham R. and Samuel H. Friedman Memorial Forest
- Allanach-Wolf Woodlands
- Ashford Oak
- Bailey Property
- Bernard Church Woods
- Bradley-Buchanan Woods
- Breen Parcel
- Broadway Meadow
- Center Meadow
- Chenes Roches Preserve
- Church Farm
- Colts Pond Road Preserve
- David Storrs Chapin Coney Rock Preserve
- Dorothy Goodwin Reserve
- Dunham Woods
- Echo Woods Beach & Echo Woods
- Elizabeth Couch Preserve
- Fliegel Farm Woods
- Fuller Preserve
- George and Margaret Hemphill Woods
- Goldberg Parcel
- Gurleyville Gristmill and House
- H. E. Preston Nature Sanctuary
- Haberman Haven
- Hall Preserve
- Harriet E. Babcock Preserve
- Hastings Memorial Forest
- Holt-Kinney Woods
- Hubbard Sanctuary & Agnes’ Pasture
- Huntington Hill Lot
- Iron Mine Valley
- Jacob’s Hill Preserve
- Jerauld A. Manter Tract
- Josias Byles Sanctuary
- Knowlton Hill Preserve
- Lof Woodlands
- Mason’s Mill Site
- Merrow Parcel
- Michael’s Preserve and Ysebaert Sanctuary
- Natchaug River Property
- Nate And Theora Whetten Woods
- Owen’s Mere
- Pappenheimer Preserve
- Pember Wetlands
- Pigeon Swamp Preserve
- Polomski Parcel
- Pond Lot
- Potter Meadow
- Proposal Rock
- Rankin Preserve
- Rollin Corner
- Skungamaug Meadows
- Taylor Preserve
- Ten Mile River Pool
- Ten Mile River Sanctuary
- Tinkerville Brook
- Tobiassen Memorial Forest
- Two Sisters Tract
- Utley Hill Preserve
- Warren Stone Preserve
- Whiting Lot
- Windfield Acres
- Windham Atlantic White Cedar Bog
- Wolf Rock Nature Preserve
Accreditation
