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Species · Wyoming · BBS 2026 Release · 1966–2025

Ferruginous Hawk Population Trend in Wyoming

All statesBirds of prey

Ferruginous Hawk in Wyoming has fallen sharply: down 51% on the route-weighted index since 1970.

-51%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 →
94Routes 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 →
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 Ferruginous Hawk Trends in WyomingNotable 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 →

Ferruginous Hawk has fallen sharply in Wyoming: down 51% on the route-weighted index since 1970.

Ferruginous Hawk Population Forecast in Wyoming

If the recent trend holds, Ferruginous Hawk in Wyoming is projected to rise about 65% by 2030 — from 0.17 in 2025 to a central estimate of 0.28 (95% range 0.00–0.59). A 5-year backtest shows a typical error of ±20.9%, with 100% of held-out values landing inside the 95% band.

+65%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 →
0.28Projected 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 →
0.00–0.5995% 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 →
±20.9%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, Ferruginous Hawk in Wyoming is projected to rise about 65% by 2030 — from 0.17 in 2025 to a central estimate of 0.28 (95% range 0.00–0.59). A 5-year backtest shows a typical error of ±20.9%, 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 →
20260.290.000.60
20270.290.000.60
20280.280.000.59
20290.280.000.59
20300.280.000.59

Ferruginous Hawk Survey Routes in Wyoming

Routes recording Ferruginous Hawk in Wyoming.
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 →
Harland Flat420171992
Highlight420071980
Newcastle420131988
Farson420052005
Glenrock319731970
Piney319891980
Pine Tree319951980
Gas Hills319931991
Pathfinder320221988
Welch320181978
Gvnt Valley320161996
Carter320162006
Hampshire320222000
Clarkelen219761971
Bill219991974
Mckinnon219701970
Crowheart220082008
Arminto220191983
Teapot Dome219831983
Sweetwater220091984
Lamont220251991
Shirley220251980
Green River219821977
Reliance220181979
Wamsutter220191990

Ferruginous Hawk Population Trend in Other States

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