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

Blue Jay Population Trend in Connecticut

All statesGeneralists

Blue Jay in Connecticut has fallen sharply: down 61% on the route-weighted index since 1968.

-61%Since 1968
20Routes In State
58Years

Notable Blue Jay Trends in Connecticut

long arc declinecomputed index

Blue Jay has fallen sharply in Connecticut: down 61% on the route-weighted index since 1968.

Blue Jay Population Forecast in Connecticut

If the recent trend holds, Blue Jay in Connecticut is projected to fall about 35% by 2029 — from 10 in 2024 to a central estimate of 6.7 (95% range 0.91–13). A 5-year backtest shows a typical error of ±21.9%, with 100% of held-out values landing inside the 95% band.

-35%Change by 2029
6.7Projected 2029 index
0.91–1395% range
±21.9%Backtest error
19662029
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
20257.71.914
20267.51.713
20277.21.413
20287.01.213
20296.70.9113

Blue Jay Survey Routes in Connecticut

Routes recording Blue Jay in Connecticut.
Southington2120241973
Westbrook2020241969
Warren1920111972
Willimantic1620181967
Greenwich1420181967
New Hartford1319871972
Woodstock 21220242016
Mystic1120231973
Danbury1120231968
Uncasville920241973
Mid Haddam920241973
Long Hill820191972
Buckingham720221966
Granby720241988
E Hartland619921966
Woodstock620071968
No Woodbury620241967
Sherman620191972
New Hartford520241994
Warren 2420242012

Blue Jay Population Trend in Other States

alabamaarkansascoloradodelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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