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

House Finch Population Trend in Colorado

All statesGeneralists

House Finch in Colorado has surged: up 76% on the route-weighted index since 1970.

+76%Since 1970TrendPercent 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 →
124Routes 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 →
57YearsYears 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 ColoradoNotable 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 Colorado: up 76% on the route-weighted index since 1970.

House Finch Population Forecast in Colorado

If the recent trend holds, House Finch in Colorado is projected to stay roughly flat through 2030, near 2.9 (95% range 1.5–4.2). A 5-year backtest shows a typical error of ±16.1%, with 100% of held-out values landing inside the 95% band.

-8%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 →
2.9Projected 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 →
1.5–4.295% 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 →
±16.1%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 Colorado is projected to stay roughly flat through 2030, near 2.9 (95% range 1.5–4.2). A 5-year backtest shows a typical error of ±16.1%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20262.81.54.1
20272.81.54.1
20282.81.54.2
20292.81.54.2
20302.91.54.2

House Finch Survey Routes in Colorado

Routes recording House Finch in Colorado.
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 →
Harmony5320251979
Rosevale4520252009
Elbert2920251998
Fruita2520071988
Cortez2120081988
Angora1920251998
Pleasant View1720212021
Yampa1420231971
Bennett1320251995
Rifle Falls1320251999
Cortez 21320172009
Nunn1220251997
Aspen1020251979
Rush1020251983
Dolores1019871968
Gilpin1020111989
Wray Gulch1020251989
Mosca1020251993
Animas 21020252005
Gold Hill 21020252019
Edison920252004
Piceance Basin920041998
Prospect Val820001993
Douglas Pass720241985
Buford720251970

House Finch Population Trend in Other States

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

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