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

Ferruginous Hawk Population Trend in Idaho

All statesGeneralists

Ferruginous Hawk in Idaho has surged: up 675% on the route-weighted index since 1977.

+675%Since 1977
26Routes In State
44Years

Notable Ferruginous Hawk Trends in Idaho

long arc increasecomputed index

Ferruginous Hawk has surged in Idaho: up 675% on the route-weighted index since 1977.

Ferruginous Hawk Population Forecast in Idaho

If the recent trend holds, Ferruginous Hawk in Idaho is projected to fall about 28% by 2029 — from 0.72 in 2024 to a central estimate of 0.52 (95% range 0.11–0.92). A 5-year backtest shows a typical error of ±126.8%, with 40% of held-out values landing inside the 95% band.

-28%Change by 2029
0.52Projected 2029 index
0.11–0.9295% range
±126.8%Backtest error
19732029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.490.090.90
20260.500.090.90
20270.500.100.91
20280.510.110.92
20290.520.110.92

Ferruginous Hawk Survey Routes in Idaho

Routes recording Ferruginous Hawk in Idaho.
Dubois920241974
Silver City420022002
Lost River320241988
Cedar Hill320141998
Kyle Canyon220241985
Circular Bu220241987
Acequia220122012
Mud Lake220212015
Almo220211988
Blackft Res119921992
Gifford119731973
Twin Buttes120231985
Tractor Flat120241988
Leadore120241994
Squirrel119771977
Blacks Creek119891989
Craters119991979
Springfield119861980
Triangle120041994
Crane Creek120141988
Iron Springs120212001
Picabo120182018
Carey120012001
Bates120001989
Daniels Res120141993

Ferruginous Hawk Population Trend in Other States

arizonacaliforniacoloradokansasmontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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