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

American Goldfinch Population Trend in Idaho

All statesGeneralists

American Goldfinch in Idaho has edged up: up 19% on the route-weighted index since 1970.

+19%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 →
46Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Goldfinch Trends in IdahoNotable 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 American Goldfinch in Idaho. See the full index history below.

American Goldfinch Population Forecast in Idaho

If the recent trend holds, American Goldfinch in Idaho is projected to rise about 13% by 2029 — from 1.6 in 2024 to a central estimate of 1.8 (95% range 0.15–3.4). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.

+13%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 →
1.8Projected 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 →
0.15–3.495% 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 →
±25.1%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, American Goldfinch in Idaho is projected to rise about 13% by 2029 — from 1.6 in 2024 to a central estimate of 1.8 (95% range 0.15–3.4). A 5-year backtest shows a typical error of ±25.1%, 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 →
20251.80.163.4
20261.80.163.4
20271.80.163.4
20281.80.153.4
20291.80.153.4

American Goldfinch Survey Routes in Idaho

Routes recording American Goldfinch in Idaho.
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 →
Almo2420231988
Glenns Ferry2019861985
Grangeville1419871986
Picabo1320211996
Squirrel920241971
Magic Mtn920241988
Pocatello920191979
Alturas719681968
Dubois620241973
Ririe520231971
Henry519831977
Daniels Res520191988
Nezperce420121968
Featherville420241989
Cabarton420231992
Naples320241972
Dougal Res320242011
Preston320231988
Gifford220171971
Cascade219841968
Rochat Divde219971997
Leadore220171988
Centerville220081972
Sawtooth City 2220232017
Burgdorf219921992

American Goldfinch Population Trend in Other States

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

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