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

House Finch Population Trend in Maine

All statesGeneralists

House Finch in Maine has surged: up 568% on the route-weighted index since 1980.

+568%Since 1980TrendPercent 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 →
43Routes 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 →
46YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable House Finch 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

House Finch has surged in Maine: up 568% on the route-weighted index since 1980.

House Finch Population Forecast in Maine

If the recent trend holds, House Finch in Maine is projected to fall about 54% by 2029 — from 1.8 in 2024 to a central estimate of 0.83 (95% range 0.00–3.7). A 5-year backtest shows a typical error of ±55.5%, with 100% of held-out values landing inside the 95% band.

-54%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 →
0.83Projected 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 →
0.00–3.795% 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 →
±55.5%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, House Finch in Maine is projected to fall about 54% by 2029 — from 1.8 in 2024 to a central estimate of 0.83 (95% range 0.00–3.7). A 5-year backtest shows a typical error of ±55.5%, with 100% of held-out values landing inside the 95% band.19782029
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 →
20251.000.003.9
20260.950.003.8
20270.910.003.8
20280.870.003.8
20290.830.003.7

House Finch Survey Routes in Maine

Routes recording House Finch 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 →
Kittery Pt2020241979
Manchester719951981
Jefferson620101991
Turner520101984
Cape Neddick420241979
Biddeford420191978
East Troy420181988
Warren419901987
Westbrook320241980
Newcastle320241982
Harmony320141990
Hancock320121991
Greenville320162016
Otisfield Gr220151982
Brooks219961989
Deblois219921992
Carrying Pl220051995
Charleston220161994
Winn219991999
Cornville220242022
Searsport220072002
Brownfield220092009
Wilson Mills120012001
Bethel120111988
Greenwood120241984

House Finch Population Trend in Other States

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

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