BirdAnalyst
Species · Idaho · BBS 2026 Release · 1966–2025

American Goldfinch Population Trend in Idaho

All statesForest birds

American Goldfinch in Idaho has held roughly steady: up 2% on the route-weighted index since 1970.

+2%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 →
57YearsYears 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 11% by 2030 — from 1.6 in 2025 to a central estimate of 1.7 (95% range 0.14–3.4). A 5-year backtest shows a typical error of ±22.8%, with 100% of held-out values landing inside the 95% band.

+11%Change by 2030TrendPercent 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 →
1.7Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.14–3.495% 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 →
±22.8%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 11% by 2030 — from 1.6 in 2025 to a central estimate of 1.7 (95% range 0.14–3.4). A 5-year backtest shows a typical error of ±22.8%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20261.80.163.4
20271.80.153.4
20281.80.153.4
20291.80.143.4
20301.70.143.4

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 →
Glenns Ferry2019861985
Almo2020251988
Grangeville1419871986
Pocatello920191979
Magic Mtn820251988
Alturas719681968
Cabarton720241992
Dubois620241973
Centerville620251972
Ririe520251971
Henry519831977
Nezperce420121968
Naples320251972
Squirrel320251971
Dougal Res320242011
Daniels Res320251988
Preston320231988
Gifford220171971
Cascade219841968
Rochat Divde219971997
Leadore220171988
Sawtooth City 2220232017
Burgdorf219921992
Crane Creek220151988
Featherville220251989

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 2026-08-14.