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

Cooper's Hawk Population Trend in Washington

All statesGeneralists

Cooper's Hawk in Washington has held roughly steady: down 3% on the route-weighted index since 1972.

-3%Since 1972TrendPercent 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 →
52Routes 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 →
43YearsYears 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 WashingtonNotable 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 Washington. See the full index history below.

Cooper's Hawk Population Forecast in Washington

If the recent trend holds, Cooper's Hawk in Washington is projected to fall about 51% by 2029 — from 0.17 in 2024 to a central estimate of 0.09 (95% range 0.01–0.17). A 5-year backtest shows a typical error of ±40.9%, with 60% of held-out values landing inside the 95% band.

-51%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 →
0.09Projected 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 →
0.01–0.1795% 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 →
±40.9%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, Cooper's Hawk in Washington is projected to fall about 51% by 2029 — from 0.17 in 2024 to a central estimate of 0.09 (95% range 0.01–0.17). A 5-year backtest shows a typical error of ±40.9%, with 60% of held-out values landing inside the 95% band.19682029
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 →
20250.080.000.17
20260.090.000.17
20270.090.010.17
20280.090.010.17
20290.090.010.17

Cooper's Hawk Survey Routes in Washington

Routes recording Cooper's Hawk in Washington.
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 →
Wapato220212021
Cusick220172004
Yakima220242018
Lake Chelan220241993
Port Angeles120221985
Warm Beach120042004
Newhalem119841984
Twisp120171971
Keller120071999
Chewelah120161979
Turnbull Nwr119991999
Vashon Is.120172004
Mcchord120032003
Reardan120181993
Bunker Hill119761976
Columbia Nwr120212021
Rimrock120031968
Snowden120191973
Kendall120182018
Winthrop120171983
Tonasket120172005
Twin Lakes119961996
Everett120231989
Ronald120221991
Leavenworth119811981

Cooper's Hawk Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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