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

American Goldfinch Population Trend in Maine

All statesForest birds

American Goldfinch in Maine has declined: down 49% on the route-weighted index since 1968.

-49%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 →
78Routes 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 MaineNotable 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 Maine. See the full index history below.

American Goldfinch Population Forecast in Maine

If the recent trend holds, American Goldfinch in Maine is projected to fall about 13% by 2030 — from 13 in 2025 to a central estimate of 11 (95% range 0.00–24). A 5-year backtest shows a typical error of ±43.4%, with 100% of held-out values landing inside the 95% band.

-13%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 →
11Projected 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 →
0.00–2495% 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 →
±43.4%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 Maine is projected to fall about 13% by 2030 — from 13 in 2025 to a central estimate of 11 (95% range 0.00–24). A 5-year backtest shows a typical error of ±43.4%, with 100% 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 →
2026110.0024
2027110.0024
2028110.0024
2029110.0024
2030110.0024

American Goldfinch Survey Routes in Maine

Routes recording American Goldfinch in Maine.
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 →
Manchester5319951971
Bowdoin Ctr4720211971
Kittery Pt4620251966
Washburn4520051979
Westbrook4420241977
Brooks4220211977
Turner 23620252011
East Troy3320211972
Otisfield Gr2920151966
Hermon2520211966
Boundary2520161993
Rome2520241996
Cornville2520252012
Turner2220101972
Newcastle2120241971
Benton2019801971
Searsport1920252002
Freedom1820221973
Jefferson1820101991
Biddeford1720191973
Castine1720061976
Ft Fairfield1620051993
Greenwood1520251971
Reeds1520251983
Medway1420251976

American Goldfinch Population Trend in Other States

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

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