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

Ferruginous Hawk Population Trend in Wyoming

All statesGeneralists

Ferruginous Hawk in Wyoming has declined: down 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 →
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 →
56YearsYears 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 →

No notable trend signals for Ferruginous Hawk in Wyoming. See the full index history below.

Ferruginous Hawk Population Forecast in Wyoming

If the recent trend holds, Ferruginous Hawk in Wyoming is projected to stay roughly flat through 2029, near 0.29 (95% range 0.00–0.60). A 5-year backtest shows a typical error of ±12.3%, with 100% of held-out values landing inside the 95% band.

-3%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 →
0.29Projected 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 →
0.00–0.6095% 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 →
±12.3%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 stay roughly flat through 2029, near 0.29 (95% range 0.00–0.60). A 5-year backtest shows a typical error of ±12.3%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.300.000.61
20260.300.000.61
20270.300.000.61
20280.300.000.61
20290.290.000.60

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 →
Shirley520241980
Harland Flat420171992
Highlight420071980
Newcastle420131988
Farson420052005
Glenrock319731970
Piney319891980
Pine Tree319951980
Boulder320241995
Gas Hills319931991
Pathfinder320221988
Kaycee320222022
Welch320181978
Gvnt Valley320161996
Carter320162006
Hampshire320222000
Carter 2320232017
Clarkelen219761971
Bill219991974
Ervay220241981
Mckinnon219701970
Soda Well220241980
Crowheart220082008
Arminto220191983
Teapot Dome219831983

Ferruginous Hawk Population Trend in Other States

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