BirdAnalyst
Species · Connecticut · BBS 2026 Release · 1966–2025

American Crow Population Trend in Connecticut

All statesGeneralists

American Crow in Connecticut has declined: down 38% on the route-weighted index since 1968.

-38%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
20Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Crow Trends in ConnecticutNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for American Crow in Connecticut. See the full index history below.

American Crow Population Forecast in Connecticut

If the recent trend holds, American Crow in Connecticut is projected to rise about 226% by 2030 — from 12 in 2025 to a central estimate of 40 (95% range 12–68). A 5-year backtest shows a typical error of ±212.7%, with 0% of held-out values landing inside the 95% band.

+226%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
40Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
12–6895% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±212.7%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, American Crow in Connecticut is projected to rise about 226% by 2030 — from 12 in 2025 to a central estimate of 40 (95% range 12–68). A 5-year backtest shows a typical error of ±212.7%, with 0% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
2026401267
2027401267
2028401267
2029401267
2030401268

American Crow Survey Routes in Connecticut

Routes recording American Crow in Connecticut.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Warren6220111972
E Hartland5019921966
Sherman3720191972
Danbury3220231968
Buckingham2820221966
Willimantic2620181967
Mystic2320231973
New Hartford2219871972
Greenwich2020181967
Uncasville1920251973
No Woodbury1820251967
Mid Haddam1720251973
New Hartford1620241994
Long Hill1420191972
Warren 21420252012
Southington1220251973
Woodstock1020071968
Granby1020251988
Westbrook820251969
Woodstock 2220242016

American Crow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.