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

Cooper's Hawk Population Trend in Wisconsin

All statesBirds of prey

Cooper's Hawk in Wisconsin has surged: up 121% on the route-weighted index since 1970.

+121%Since 1970TrendPercent 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 →
84Routes 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 →
57YearsYears 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 WisconsinNotable 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 Wisconsin. See the full index history below.

Cooper's Hawk Population Forecast in Wisconsin

If the recent trend holds, Cooper's Hawk in Wisconsin is projected to rise about 43% by 2030 — from 0.11 in 2025 to a central estimate of 0.16 (95% range 0.07–0.25). A 5-year backtest shows a typical error of ±64.7%, with 80% of held-out values landing inside the 95% band.

+43%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 →
0.16Projected 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 →
0.07–0.2595% 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 →
±64.7%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 Wisconsin is projected to rise about 43% by 2030 — from 0.11 in 2025 to a central estimate of 0.16 (95% range 0.07–0.25). A 5-year backtest shows a typical error of ±64.7%, with 80% 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 →
20260.150.070.24
20270.160.070.25
20280.160.070.25
20290.160.070.25
20300.160.070.25

Cooper's Hawk Survey Routes in Wisconsin

Routes recording Cooper's Hawk in Wisconsin.
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 →
Union Twp220252003
Gilmanton220232008
Trempealeau220071987
Manawa220211979
New Lisbon220142005
N Freedom220231983
Hebron220211988
Paris220252014
Beloit220162016
Chaffey120252025
Iron River120222022
Bayfield120021993
Montreal119931993
Land O Lakes120032003
Hudson120192001
Dresser120221976
Loraine120171971
Cumberland120161995
Weyerhauser120241988
Couderay120091978
Exeland120111990
Gilman119971975
Holway119871972
Phillips120241994
Rib Lake120031982

Cooper's Hawk Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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