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

House Finch Population Trend in Delaware

All statesGeneralists

House Finch in Delaware has surged: up 33× on the route-weighted index since 1980.

33×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 →
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 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 33× 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 32% by 2030 — from 16 in 2025 to a central estimate of 11 (95% range 0.00–23). A 5-year backtest shows a typical error of ±23.3%, with 100% of held-out values landing inside the 95% band.

-32%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 →
0.00–2395% 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 →
±23.3%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 32% by 2030 — from 16 in 2025 to a central estimate of 11 (95% range 0.00–23). A 5-year backtest shows a typical error of ±23.3%, with 100% of held-out values landing inside the 95% band.19782030
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 →
2026110.0023
2027110.0023
2028110.0023
2029110.0023
2030110.0023

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 →
Harrington4220251979
Bethany Bch2319901984
Milton 21920252017
Pepperbox 21920252017
Holleyville 21820242006
Milton1720161987
Frederica1320251980
Holleyville1220041988
Georgetown1220221992
Dover1019871985
Mt Pleasant520191980
Wilmington420141978
Blackbird320251994
Pepperbox320161998
Frankford220121991
Lowes Xrds119911991
Millsboro120252017

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 2026-08-14.