- 4H Nature Navigators
- Barnstable Land Trust
- Cape Cod Museum of Natural History
- Chatham Conservation Foundation
- Edible South Shore & South Coast
- Friends of the Cape Cod Museum of Natural History
- Friends of Ellisville Marsh
- Friends of Hawksnest State Park
- Friends of Myles Standish State Forest
- Friends of Nickerson State Park
- Friends of Scusset Beach Reservation
- Harwich Conservation Trust
- Hear Cape Cod
- Hitchcock Center for the Environment
- Kopper Art
- Living on Earth
- Marion Natural History Museum
- Mass Audubon
- Mass Audubon Ecological Extension Service
- Massachusetts Department of Conservation and Recreation
- Migration Productions
- The Nature Conservancy
- National Park Service
- Native Plymouth Tours
- Neponset River Watershed Association
- New England Mountain Bike Association - Southeastern Massachusetts Chapter
- North and South River Watershed Association
- Orenda Wildlife Trust
- PACTV Community News
- Pembroke Watershed Association
- Pinewoods Camp
- The Polly Hill Arboretum
- Plymouth Garden Club
- Plymouth Outdoors
- Roger Williams Park Zoo
- Sierra Club
- South Shore Natural Science Center
- Surfrider Foundation - Massachusetts Chapter
- Taunton River Watershed Alliance
- Three Bays Preservation, Inc.
- Town of Duxbury Community Preservation Committee
- Town of Plymouth Community Preservation Committee
- Town of Plymouth Natural Resources & Coastal Beaches Committee
- Town of Plymouth Open Space Committee
- Town of Provincetown Department of Harbor and Pier
- The Trustees of Reservations
- Unity on Cape Cod
- U.S. Fish and Wildlife Service
- Wampanoag Tribe of Gay Head
- Waquoit Bay National Estuarine Research Reserve
- WATD
- WCAI
- Weir River Watershed Association
- Westport River Watershed Alliance
- White Horse Beach Association
- Wicked Local Plymouth
- Wildlands Trust of Southeastern Massachusetts