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

Cooper's Hawk Population Trend in Connecticut

All statesGeneralists

Cooper's Hawk in Connecticut has increased: up 38% on the route-weighted index since 1981.

+38%Since 1981TrendPercent 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 →
17Routes 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 →
24YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Cooper's Hawk 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 Cooper's Hawk in Connecticut. See the full index history below.

Cooper's Hawk Population Forecast in Connecticut

If the recent trend holds, Cooper's Hawk in Connecticut is projected to rise about 71% by 2027 — from 0.09 in 2022 to a central estimate of 0.16 (95% range 0.04–0.27). A 5-year backtest shows a typical error of ±77.5%, with 100% of held-out values landing inside the 95% band.

+71%Change by 2027TrendPercent 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 →
0.16Projected 2027 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.04–0.2795% 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 →
±77.5%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, Cooper's Hawk in Connecticut is projected to rise about 71% by 2027 — from 0.09 in 2022 to a central estimate of 0.16 (95% range 0.04–0.27). A 5-year backtest shows a typical error of ±77.5%, with 100% of held-out values landing inside the 95% band.19732027
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 →
20230.150.040.26
20240.150.040.27
20250.150.040.27
20260.150.040.27
20270.160.040.27

Cooper's Hawk Survey Routes in Connecticut

Routes recording Cooper's Hawk 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 →
Mystic120211987
Buckingham120142014
Uncasville120152015
Woodstock119811973
Westbrook120192019
Willimantic120052005
No Woodbury120122002
Sherman119821982
Greenwich120092009
Danbury120152015
Warren120021980
New Hartford120171999
Mid Haddam120151973
Southington120162005
Woodstock 2120162016
Warren 2120222022
Granby120212015

Cooper's Hawk Population Trend in Other States

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

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