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

Cooper's Hawk Population Trend in Pennsylvania

All statesGeneralists

Cooper's Hawk in Pennsylvania has surged: up 366% on the route-weighted index since 1969.

+366%Since 1969TrendPercent 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 →
106Routes 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 →
56YearsYears 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 PennsylvaniaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Cooper's Hawk has surged in Pennsylvania: up 366% on the route-weighted index since 1969.

Cooper's Hawk Population Forecast in Pennsylvania

If the recent trend holds, Cooper's Hawk in Pennsylvania is projected to rise about 14% by 2029 — from 0.17 in 2024 to a central estimate of 0.19 (95% range 0.12–0.27). A 5-year backtest shows a typical error of ±21.7%, with 80% of held-out values landing inside the 95% band.

+14%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 →
0.19Projected 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 →
0.12–0.2795% 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 →
±21.7%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, Cooper's Hawk in Pennsylvania is projected to rise about 14% by 2029 — from 0.17 in 2024 to a central estimate of 0.19 (95% range 0.12–0.27). A 5-year backtest shows a typical error of ±21.7%, with 80% of held-out values landing inside the 95% band.19672029
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 →
20250.180.100.26
20260.180.110.26
20270.190.110.26
20280.190.110.27
20290.190.120.27

Cooper's Hawk Survey Routes in Pennsylvania

Routes recording Cooper's Hawk in Pennsylvania.
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 →
Clearfield920222001
Brunnerville 2320212013
Lynch220151985
Waller220121982
Greentown220111976
Kittanning220241972
Geeseytown220212009
Middletown220231997
Duboistown219921992
Schaefferstown 2220152015
Brick Tavern220222011
Bendersville220162006
Jacobus220152006
Slippery Rk119801977
Espyville120241994
Clover120132001
Harmonsburg120191997
Ferris Crnrs120001986
Whig Hill120141985
Teepleville120242004
Sigel120222004
N Washington120241982
N Pine Grove120111995
Betula120171988
Russell City119951995

Cooper's Hawk Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonrhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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