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

American Crow Population Trend in Connecticut

All statesGeneralists

American Crow in Connecticut has declined: down 25% on the route-weighted index since 1968.

-25%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 →
58YearsYears 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 221% by 2029 — from 13 in 2024 to a central estimate of 42 (95% range 15–69). A 5-year backtest shows a typical error of ±207.9%, with 0% of held-out values landing inside the 95% band.

+221%Change by 2029TrendPercent 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 →
42Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
15–6995% 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 →
±207.9%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 221% by 2029 — from 13 in 2024 to a central estimate of 42 (95% range 15–69). A 5-year backtest shows a typical error of ±207.9%, with 0% of held-out values landing inside the 95% band.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 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 →
2025421568
2026421569
2027421569
2028421569
2029421569

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
Uncasville2020241973
Greenwich2020181967
No Woodbury1720241967
New Hartford1620241994
Mid Haddam1520241973
Long Hill1420191972
Southington1420241973
Warren 21420242012
Westbrook1220241969
Woodstock1020071968
Granby820241988
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 2026-05-22.