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

Northern Cardinal Population Trend in Connecticut

All statesGeneralists

Northern Cardinal in Connecticut has surged: up 279% on the route-weighted index since 1968.

+279%Since 1968
20Routes In State
58Years

Notable Northern Cardinal Trends in Connecticut

long arc increasecomputed index

Northern Cardinal has surged in Connecticut: up 279% on the route-weighted index since 1968.

Northern Cardinal Population Forecast in Connecticut

If the recent trend holds, Northern Cardinal in Connecticut is projected to rise about 58% by 2029 — from 21 in 2024 to a central estimate of 33 (95% range 26–41). A 5-year backtest shows a typical error of ±37.4%, with 20% of held-out values landing inside the 95% band.

+58%Change by 2029
33Projected 2029 index
26–4195% range
±37.4%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
2025322439
2026322439
2027322540
2028332540
2029332641

Northern Cardinal Survey Routes in Connecticut

Routes recording Northern Cardinal in Connecticut.
Willimantic7220181967
Warren6420111972
Long Hill4520191972
Southington4020241973
Mystic3720231973
Danbury3420231968
Greenwich2720181967
Uncasville2620241973
Buckingham2520221967
Westbrook2520241969
Mid Haddam2320241973
New Hartford2020241994
No Woodbury1720241967
E Hartland1619921966
Granby1520241988
Woodstock1420071970
Warren 21320242012
Sherman1220191972
Woodstock 21020242016
New Hartford819871972

Northern Cardinal Population Trend in Other States

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

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