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

Herring Gull Population Trend in Connecticut

All statesWetland birds

Herring Gull in Connecticut has edged down: down 18% on the route-weighted index since 1971.

-18%Since 1971
11Routes In State
48Years

Notable Herring Gull Trends in Connecticut

No notable trend signals for Herring Gull in Connecticut. See the full index history below.

Herring Gull Population Forecast in Connecticut

If the recent trend holds, Herring Gull in Connecticut is projected to fall about 100% by 2029 — from 0.44 in 2024 to a central estimate of 0.00 (95% range 0.00–2.8). A 5-year backtest shows a typical error of ±46.5%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2.895% range
±46.5%Backtest error
19692029
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
20250.200.003.1
20260.140.003.0
20270.080.002.9
20280.020.002.9
20290.000.002.8

Herring Gull Survey Routes in Connecticut

Routes recording Herring Gull in Connecticut.
Mystic620231973
Westbrook420241969
Southington219951995
E Hartland119871987
Uncasville119921977
Willimantic119971988
Greenwich120001969
Danbury120231971
Long Hill119751975
Mid Haddam119961973
New Hartford119821972

Herring Gull Population Trend in Other States

alabamaalaskacaliforniacoloradodelawarefloridaidahoillinoisindianakansaslouisianamainemarylandmassachusettsmichiganminnesotamontananew-hampshirenew-jerseynew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-carolinatexasvermontvirginiawashingtonwest-virginiawisconsin

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