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

Ferruginous Hawk Population Trend in Nevada

All statesGeneralists

Ferruginous Hawk in Nevada has increased: up 35% on the route-weighted index since 1970.

+35%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 →
22Routes 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 →
42YearsYears 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 NevadaNotable 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 Nevada. See the full index history below.

Ferruginous Hawk Population Forecast in Nevada

If the recent trend holds, Ferruginous Hawk in Nevada is projected to rise about 67% by 2029 — from 0.14 in 2024 to a central estimate of 0.24 (95% range 0.04–0.44). A 5-year backtest shows a typical error of ±24.7%, with 100% of held-out values landing inside the 95% band.

+67%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 →
0.24Projected 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 →
0.04–0.4495% 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 →
±24.7%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 Nevada is projected to rise about 67% by 2029 — from 0.14 in 2024 to a central estimate of 0.24 (95% range 0.04–0.44). A 5-year backtest shows a typical error of ±24.7%, 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 →
20250.230.030.43
20260.230.030.43
20270.240.040.44
20280.240.040.44
20290.240.040.44

Ferruginous Hawk Survey Routes in Nevada

Routes recording Ferruginous Hawk in Nevada.
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 →
Cortez220241971
Willis220151998
Ruby Valley220002000
Chimney Res.220232023
Piute Mdws120172017
Midas120131990
Ranchogrande120001995
Sheldon Nwr120182007
Walker Can120241969
Mizpah120231990
Virgin Creek119971997
Frenchman119761973
Toiyabe Nf120182013
Eureka120081994
Illipah120171990
Majors Place120171999
Thorne119781978
Dobbin Creek120181968
Minerva120181989
Mill City120162016
Bald Mtn.120241992
Darroughs Hot Spgs120182018

Ferruginous Hawk Population Trend in Other States

arizonacaliforniacoloradoidahokansasmontananebraskanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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