BirdAnalyst
Species · BCR 22 · BBS 2026 Release · 1966–2025

Cooper's Hawk In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieBirds of prey

Cooper's Hawk in Eastern Tallgrass Prairie has surged: up 478% on the route-weighted index since 1968.

+478%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 →
215Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Eastern Tallgrass Prairie. See the full index history below.

Cooper's Hawk In Eastern Tallgrass Prairie Population Forecast

If the recent trend holds, Cooper's Hawk in Eastern Tallgrass Prairie is projected to rise about 87% by 2030 — from 0.11 in 2025 to a central estimate of 0.20 (95% range 0.13–0.27). A 5-year backtest shows a typical error of ±32.9%, with 80% of held-out values landing inside the 95% band.

+87%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 →
0.20Projected 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 →
0.13–0.2795% 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 →
±32.9%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 Eastern Tallgrass Prairie is projected to rise about 87% by 2030 — from 0.11 in 2025 to a central estimate of 0.20 (95% range 0.13–0.27). A 5-year backtest shows a typical error of ±32.9%, 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 →
20260.190.120.26
20270.190.120.26
20280.190.120.26
20290.200.130.27
20300.200.130.27

Routes In Eastern Tallgrass Prairie

Routes recording Cooper's Hawk in Eastern Tallgrass Prairie.
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 →
KokomoINDIANA42021
HudsonIOWA42013
ColumbiaILLINOIS32022
Witts StationINDIANA32024
HarveysburgOHIO31992
Mill CreekILLINOIS22019
JanesvilleILLINOIS22024
HumboldtILLINOIS22022
OlneyILLINOIS22004
Troy GroveILLINOIS22022
NilwoodILLINOIS22012
FriendswoodINDIANA22011
Crown PointINDIANA22011
DecaturINDIANA22018
MaplewoodINDIANA22019
BrooklynIOWA22025
OlatheKANSAS22021
PittsburgKANSAS22012
MoreheadKANSAS22016
TrentonMISSOURI22017
FrankfordMISSOURI22005
JohnsonNEBRASKA22025
IrvingtonNEBRASKA22009
BotkinsOHIO22015
XeniaOHIO22017

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