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

Cooper's Hawk Population Trend in Utah

All statesGeneralists

Cooper's Hawk in Utah has fallen sharply: down 72% on the route-weighted index since 1982.

-72%Since 1982TrendPercent 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 →
50Routes 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 →
39YearsYears 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 UtahNotable 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 declinecomputed 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 fallen sharply in Utah: down 71% on the route-weighted index since 1982.

Cooper's Hawk Population Forecast in Utah

If the recent trend holds, Cooper's Hawk in Utah is projected to fall about 59% by 2029 — from 0.07 in 2024 to a central estimate of 0.03 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±61.2%, with 100% of held-out values landing inside the 95% band.

-59%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 →
0.03Projected 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 →
0.00–0.1295% 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 →
±61.2%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 Utah is projected to fall about 59% by 2029 — from 0.07 in 2024 to a central estimate of 0.03 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±61.2%, with 100% of held-out values landing inside the 95% band.19712029
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 →
20250.030.000.12
20260.030.000.12
20270.030.000.12
20280.030.000.12
20290.030.000.12

Cooper's Hawk Survey Routes in Utah

Routes recording Cooper's Hawk in Utah.
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 →
Ferron320182001
Shivwitz220182011
Wellington 3120212014
Moon Lake 2120212021
Beck119771977
Altonah119821982
Book Ridge120222016
Lost Cr. Res120172002
Red Spur Mtn.120081998
Bryce Canyon120242008
Woodruff120082008
Beaver119901982
Navajo Lake120072007
Boulder119951971
Hite120051993
Aneth120142014
Lynn120231991
Vernon120232014
M Warner Res120181994
Fayette120172006
Skyline Driv119991999
Richfield120152014
Gooseberry120102010
Dixie Nf119961994
Hatch120192003

Cooper's Hawk Population Trend in Other States

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

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