Species · Massachusetts · BBS 2025 Release · 1966–2024
Green Heron Population Trend in Massachusetts
Green Heron in Massachusetts has edged down: down 22% on the route-weighted index since 1969.
-22%Since 1969
28Routes In State
55Years
Notable Green Heron Trends in Massachusetts
No notable trend signals for Green Heron in Massachusetts. See the full index history below.
Green Heron Population Forecast in Massachusetts
If the recent trend holds, Green Heron in Massachusetts is projected to rise about 140% by 2029 — from 0.07 in 2024 to a central estimate of 0.16 (95% range 0.00–0.46). A 5-year backtest shows a typical error of ±100.3%, with 80% of held-out values landing inside the 95% band.
+140%Change by 2029
0.16Projected 2029 index
0.00–0.4695% range
±100.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.17 | 0.00 | 0.47 |
| 2026 | 0.17 | 0.00 | 0.46 |
| 2027 | 0.17 | 0.00 | 0.46 |
| 2028 | 0.16 | 0.00 | 0.46 |
| 2029 | 0.16 | 0.00 | 0.46 |
Green Heron Survey Routes in Massachusetts
| Pittsfield | 4 | 2005 | 1988 |
| Newburyport | 3 | 2011 | 1970 |
| S Barre | 2 | 2023 | 1970 |
| N. Andover | 2 | 2018 | 1995 |
| Warren 2 | 2 | 2012 | 2012 |
| E Dennis | 1 | 2016 | 1973 |
| Chilmark | 1 | 1975 | 1969 |
| Marion | 1 | 2013 | 1969 |
| Wellfleet | 1 | 2005 | 1970 |
| Prattville | 1 | 2017 | 1968 |
| Brockton | 1 | 1996 | 1969 |
| Maynard | 1 | 2018 | 1968 |
| Littleton | 1 | 2021 | 1970 |
| N Oxford | 1 | 2012 | 2008 |
| Mansfield | 1 | 2007 | 1993 |
| Princeton | 1 | 1972 | 1972 |
| E Pepperell | 1 | 1993 | 1967 |
| Belchertown | 1 | 2015 | 1996 |
| Warren | 1 | 2008 | 1970 |
| N Orange | 1 | 2014 | 1972 |
| Cummington | 1 | 1986 | 1969 |
| Chesterfield | 1 | 2005 | 1971 |
| Cheshire | 1 | 1994 | 1972 |
| Sheffield | 1 | 2008 | 1975 |
| Cape Cod Ns | 1 | 1992 | 1991 |
Green Heron Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.