BirdAnalyst
Species · New Jersey · BBS 2025 Release · 1966–2024

Cooper's Hawk Population Trend in New Jersey

All statesGeneralists

Cooper's Hawk in New Jersey has surged: up 359% on the route-weighted index since 1988.

+359%Since 1988TrendPercent 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 →
25Routes 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 →
34YearsYears 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 New JerseyNotable 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 New Jersey: up 359% on the route-weighted index since 1988.

Cooper's Hawk Population Forecast in New Jersey

If the recent trend holds, Cooper's Hawk in New Jersey is projected to fall about 13% by 2029 — from 0.29 in 2024 to a central estimate of 0.25 (95% range 0.06–0.44). A 5-year backtest shows a typical error of ±128.9%, with 80% of held-out values landing inside the 95% band.

-13%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 →
0.25Projected 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 →
0.06–0.4495% 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 →
±128.9%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 New Jersey is projected to fall about 13% by 2029 — from 0.29 in 2024 to a central estimate of 0.25 (95% range 0.06–0.44). A 5-year backtest shows a typical error of ±128.9%, with 80% of held-out values landing inside the 95% band.19772029
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 →
20250.230.040.42
20260.240.040.43
20270.240.050.43
20280.240.050.44
20290.250.060.44

Cooper's Hawk Survey Routes in New Jersey

Routes recording Cooper's Hawk in New Jersey.
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 →
Sandbrook220231997
Pottersville220111996
Cranbury220242002
Woodbury Hgt120241994
Greenwich120231995
Bennett Mill120002000
Holmansville119921992
New Bedford120241997
Croton120011989
Hope119911991
Kemah Lake120241991
Bloomsbury120231988
High Point120151980
Dover120222022
Gillette120231999
Keyport120172016
Roosevelt120132013
Friendship120231997
Pomona120232022
Mt Misery119771977
Pedricktown 2120242015
Cape May Ch120132005
Pedricktown120122005
Bennett Mill 2120162016
Ramseysburg120191995

Cooper's Hawk Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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