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Species · Maryland · BBS 2026 Release · 1966–2025

Cooper's Hawk Population Trend in Maryland

All statesBirds of prey

Cooper's Hawk in Maryland has surged: up 12× on the route-weighted index since 1968.

12×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 →
64Routes 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 →
51YearsYears 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 MarylandNotable 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 Maryland. See the full index history below.

Cooper's Hawk Population Forecast in Maryland

If the recent trend holds, Cooper's Hawk in Maryland is projected to fall about 15% by 2030 — from 0.34 in 2025 to a central estimate of 0.29 (95% range 0.17–0.42). A 5-year backtest shows a typical error of ±22.6%, with 80% of held-out values landing inside the 95% band.

-15%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 →
0.29Projected 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 →
0.17–0.4295% 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 →
±22.6%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 Maryland is projected to fall about 15% by 2030 — from 0.34 in 2025 to a central estimate of 0.29 (95% range 0.17–0.42). A 5-year backtest shows a typical error of ±22.6%, 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 →
20260.270.150.40
20270.280.150.40
20280.280.160.41
20290.290.160.41
20300.290.170.42

Cooper's Hawk Survey Routes in Maryland

Routes recording Cooper's Hawk in Maryland.
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 →
Emmitsburg320252009
Potomac Park220101999
Eklo220182005
Van Bibber220082000
Madonna220222015
Jennings220252002
St. George'S Island220172015
Ijamsville220221987
Floyd120172010
Vindex119871983
Oldtown119861986
Williamsport120232001
Smithsburg120111983
Wolfsville120241970
Fair Hill119941994
Olney120241990
Warfieldsbrg120131991
Pleasant Val120151984
Bachman Mill120241986
Fowblesburg120161993
Randallstown120131997
Walnut120112011
Berlin119921992
Beltsville120111987
Cheltenham119991988

Cooper's Hawk Population Trend in Other States

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

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