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

Brown-headed Cowbird Population Trend in Idaho

All statesGeneralists

Brown-headed Cowbird in Idaho has edged down: down 24% on the route-weighted index since 1970.

-24%Since 1970
64Routes In State
56Years

Notable Brown-headed Cowbird Trends in Idaho

No notable trend signals for Brown-headed Cowbird in Idaho. See the full index history below.

Brown-headed Cowbird Population Forecast in Idaho

If the recent trend holds, Brown-headed Cowbird in Idaho is projected to rise about 76% by 2029 — from 3.2 in 2024 to a central estimate of 5.6 (95% range 0.00–11). A 5-year backtest shows a typical error of ±60.1%, with 100% of held-out values landing inside the 95% band.

+76%Change by 2029
5.6Projected 2029 index
0.00–1195% range
±60.1%Backtest error
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 index95% low95% high
20255.80.0112
20265.70.0012
20275.70.0011
20285.70.0011
20295.60.0011

Brown-headed Cowbird Survey Routes in Idaho

Routes recording Brown-headed Cowbird in Idaho.
Cascade5519841968
Glenns Ferry2719861968
Picabo2020211988
Pocatello1820191979
Cedar Hill1820241989
Cabarton1820231985
Joel1720241989
Gifford1420171971
Mud Lake920231988
Pierce820071990
Ririe720231971
Cape Horn620241972
Acequia620121979
Almo620231988
Daniels Res620191988
Baker520241976
Coolin520241986
Triangle420241985
Henry419831973
Sawtooth City 2420242015
Salmon River419941994
Naples320241973
Mivoden320231977
Leadore320231984
Dubois320241972

Brown-headed Cowbird Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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