BirdAnalyst
Species · Connecticut · BBS 2025 Release · 1966–2024

Green Heron Population Trend in Connecticut

All statesWetland birds

Green Heron in Connecticut has declined: down 46% on the route-weighted index since 1969.

-46%Since 1969
17Routes In State
50Years

Notable Green Heron Trends in Connecticut

No notable trend signals for Green Heron in Connecticut. See the full index history below.

Green Heron Population Forecast in Connecticut

If the recent trend holds, Green Heron in Connecticut is projected to fall about 39% by 2028 — from 0.27 in 2023 to a central estimate of 0.17 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±66.4%, with 100% of held-out values landing inside the 95% band.

-39%Change by 2028
0.17Projected 2028 index
0.00–0.4295% range
±66.4%Backtest error
19672028
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20240.180.000.44
20250.180.000.43
20260.170.000.43
20270.170.000.42
20280.170.000.42

Green Heron Survey Routes in Connecticut

Routes recording Green Heron in Connecticut.
Granby420161991
Warren220101975
Long Hill219901973
Mystic120231973
E Hartland119881967
Buckingham120131989
Uncasville120172015
Woodstock119951977
Westbrook120111973
Willimantic120051969
No Woodbury120141969
Sherman120021973
Greenwich120171981
Danbury120101968
Mid Haddam120231974
Southington120231990
New Hartford119851972

Green Heron Population Trend in Other States

alabamaarizonaarkansascaliforniadelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.