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

House Finch Population Trend in Delaware

All statesGeneralists

House Finch in Delaware has surged: up 29× on the route-weighted index since 1980.

29×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 →
17Routes 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 →
45YearsYears 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 DelawareNotable 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 Delaware: up 29× on the route-weighted index since 1980.

House Finch Population Forecast in Delaware

If the recent trend holds, House Finch in Delaware is projected to fall about 10% by 2029 — from 12 in 2024 to a central estimate of 10 (95% range 0.00–22). A 5-year backtest shows a typical error of ±36.2%, with 100% of held-out values landing inside the 95% band.

-10%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 →
10Projected 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 →
0.00–2295% 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 →
±36.2%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, House Finch in Delaware is projected to fall about 10% by 2029 — from 12 in 2024 to a central estimate of 10 (95% range 0.00–22). A 5-year backtest shows a typical error of ±36.2%, 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 →
2025100.0022
2026100.0022
2027100.0022
2028100.0022
2029100.0022

House Finch Survey Routes in Delaware

Routes recording House Finch in Delaware.
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 →
Harrington3420241979
Bethany Bch2319901984
Holleyville 21820242006
Milton1720161987
Holleyville1220041988
Georgetown1220221992
Dover1019871985
Frederica620141980
Millsboro620222017
Mt Pleasant520191980
Wilmington420141978
Pepperbox 2420242017
Pepperbox320161998
Milton 2320172017
Frankford220121991
Blackbird220241994
Lowes Xrds119911991

House Finch Population Trend in Other States

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

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