January 1–December 31
Maine, New Hampshire, New York, Vermont
Appalachian Mountain Club
January 1–December 31
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
The University of Georgia Center for Invasive Species and Ecosystem Health
January 1–December 31
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
Northern Essex Community College
January 1–December 31
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
January 1–December 31
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
Arnold Arboretum of Harvard University
February 1–April 30
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
International Rusty Blackbird Working Group
May 1–September 30
Maine, New Hampshire, New York, Vermont
Appalachian Mountain Club
June 1–June 30
Maine, New Hampshire, New York, Vermont
Vermont Center for Ecostudies
June 1–June 30
Maine, New Hampshire, New York, Vermont
Vermont Center for Ecostudies
December 1–January 31
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
National Audubon Society
January 1–December 31
Maine, Massachusetts, New Hampshire, New York, Vermont
July 24–August 2
Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
Monarch Larva Monitoring Project
January 1–June 30
Maine, Massachusetts, New Hampshire, New York, Vermont
Chronolog