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

Ferruginous Hawk Population Trend in Kansas

All statesGeneralists

Ferruginous Hawk in Kansas has increased: up 49% on the route-weighted index since 1974.

+49%Since 1974TrendPercent 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 →
16Routes 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 →
35YearsYears 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 KansasNotable 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 Kansas. See the full index history below.

Ferruginous Hawk Population Forecast in Kansas

If the recent trend holds, Ferruginous Hawk in Kansas is projected to stay roughly flat through 2026, near 0.07 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±36.5%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2026TrendPercent 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 →
0.07Projected 2026 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1495% 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 →
±36.5%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 Kansas is projected to stay roughly flat through 2026, near 0.07 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±36.5%, with 100% of held-out values landing inside the 95% band.19712026
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 →
20220.070.000.14
20230.070.000.14
20240.070.000.14
20250.070.000.14
20260.070.000.14

Ferruginous Hawk Survey Routes in Kansas

Routes recording Ferruginous Hawk in Kansas.
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 →
St John519821981
Leoti420182009
Winona220152002
Ashland219711971
Jewell119901990
Phillipsburg119881988
Rexford120152013
Gove120171981
Ruleton120072001
Lakin120211982
Hopewell120062005
Albert119811976
Gray119741974
Wallace120211972
Leoville120131999
Grigston120172003

Ferruginous Hawk Population Trend in Other States

arizonacaliforniacoloradoidahomontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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