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

Ferruginous Hawk Population Trend in Oregon

All statesGeneralists

Ferruginous Hawk in Oregon has risen sharply: up 65% on the route-weighted index since 1973.

+65%Since 1973TrendPercent 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 →
33Routes 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 →
48YearsYears 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 OregonNotable 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 increasecomputed 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 risen sharply in Oregon: up 65% on the route-weighted index since 1973.

Ferruginous Hawk Population Forecast in Oregon

If the recent trend holds, Ferruginous Hawk in Oregon is projected to rise about 16% by 2029 — from 0.13 in 2024 to a central estimate of 0.15 (95% range 0.04–0.26). A 5-year backtest shows a typical error of ±24%, with 80% of held-out values landing inside the 95% band.

+16%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 →
0.15Projected 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 →
0.04–0.2695% 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%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 Oregon is projected to rise about 16% by 2029 — from 0.13 in 2024 to a central estimate of 0.15 (95% range 0.04–0.26). A 5-year backtest shows a typical error of ±24%, with 80% of held-out values landing inside the 95% band.19712029
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 →
20250.140.040.26
20260.150.040.26
20270.150.040.26
20280.150.040.26
20290.150.040.26

Ferruginous Hawk Survey Routes in Oregon

Routes recording Ferruginous Hawk in Oregon.
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 →
Fandango Can420241988
Malheur Nwr420221989
Imnaha319821982
Blitzen319931981
Three Forks220212015
Bridgeport220132009
Buchanan220001983
Joseph220241971
Green Mtn.220241994
Crane220241993
Sheaville220122012
Blitzen 2120231997
Zumwalt120041995
Wagontire120241988
Crowley120061984
Montague120231974
Eightmile119991987
Granite119881988
Clover Creek120242018
Princeton119841984
Adrian120082005
Blizzard Gap120211989
Fish Lake119831983
Battle Mtn119901988
Mikkalo120011996

Ferruginous Hawk Population Trend in Other States

arizonacaliforniacoloradoidahokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomasouth-dakotatexasutahwashingtonwyoming

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