BirdAnalyst
Species · BCR 17 · BBS 2026 Release · 1966–2025

Ferruginous Hawk In Badlands and Prairies

All regionsBadlands and PrairiesBirds of prey

Ferruginous Hawk in Badlands and Prairies has increased: up 41% on the route-weighted index since 1970.

+41%Since 1970TrendPercent 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 →
98Routes 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 →
57YearsYears 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 Ferruginous Hawk in Badlands and Prairies. See the full index history below.

Ferruginous Hawk In Badlands and Prairies Population Forecast

If the recent trend holds, Ferruginous Hawk in Badlands and Prairies is projected to rise about 106% by 2030 — from 0.17 in 2025 to a central estimate of 0.36 (95% range 0.14–0.58). A 5-year backtest shows a typical error of ±42%, with 100% of held-out values landing inside the 95% band.

+106%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 →
0.36Projected 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 →
0.14–0.5895% 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 →
±42%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, Ferruginous Hawk in Badlands and Prairies is projected to rise about 106% by 2030 — from 0.17 in 2025 to a central estimate of 0.36 (95% range 0.14–0.58). A 5-year backtest shows a typical error of ±42%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.350.130.57
20270.350.140.57
20280.350.140.57
20290.360.140.57
20300.360.140.58

Routes In Badlands and Prairies

Routes recording Ferruginous Hawk in Badlands and Prairies.
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 →
Jordan SouthMONTANA52021
Harland FlatWYOMING42017
HighlightWYOMING42007
NewcastleWYOMING42013
PowdervilleMONTANA32024
Coleman CouleeMONTANA32021
GlenrockWYOMING31973
PineyWYOMING31989
Pine TreeWYOMING31995
WelchWYOMING32018
Gvnt ValleyWYOMING32016
HampshireWYOMING32022
BrusettMONTANA22017
ShawmutMONTANA22023
WebsterMONTANA21992
Miles CityMONTANA22021
Bull Mtn.MONTANA22016
GolvaNORTH-DAKOTA22025
IsabelSOUTH-DAKOTA22015
CottonwoodSOUTH-DAKOTA22025
S. PioneerSOUTH-DAKOTA22024
ClarkelenWYOMING21976
BillWYOMING21999
Teapot DomeWYOMING21983
SavagetonWYOMING22019

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