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

American Goldfinch Population Trend in Wisconsin

All statesForest birds

American Goldfinch in Wisconsin has held roughly steady: down 9% on the route-weighted index since 1968.

-9%Since 1968TrendPercent 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 →
98Routes 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 →
59YearsYears 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 WisconsinNotable 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 Wisconsin. See the full index history below.

American Goldfinch Population Forecast in Wisconsin

If the recent trend holds, American Goldfinch in Wisconsin is projected to rise about 38% by 2030 — from 13 in 2025 to a central estimate of 18 (95% range 10–26). A 5-year backtest shows a typical error of ±69.2%, with 20% of held-out values landing inside the 95% band.

+38%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 →
18Projected 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 →
10–2695% 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 →
±69.2%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 Wisconsin is projected to rise about 38% by 2030 — from 13 in 2025 to a central estimate of 18 (95% range 10–26). A 5-year backtest shows a typical error of ±69.2%, with 20% of held-out values landing inside the 95% band.19662030
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 →
2026189.825
2027189.825
2028189.925
2029181026
2030181026

American Goldfinch Survey Routes in Wisconsin

Routes recording American Goldfinch in Wisconsin.
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 →
Omro4520011966
Mukwonago4220041998
Manitowoc3920241966
Trempealeau3620251966
Kiel3420251998
Highland3220251998
N Andover2720251967
Paris2720251966
Oconto Falls2520231968
Kendall2220251967
Brownsville2220251966
Meridean2220251998
Grimms2220211998
Beloit2220251998
Gresham2120251998
Holland2120251998
Eden2020251966
Bashaw2020251998
River Falls2020251998
Annaton2020251998
Mukwonago 22020252005
Viroqua1920241966
Gilmanton1820251966
Wis Rapids1820231966
Stevens Pt1820231966

American Goldfinch Population Trend in Other States

alabamaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.