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

European Starling Population Trend in Colorado

All statesGeneralists

European Starling in Colorado has increased: up 27% on the route-weighted index since 1970.

+27%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 →
137Routes 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 European Starling 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 →

No notable trend signals for European Starling in Colorado. See the full index history below.

European Starling Population Forecast in Colorado

If the recent trend holds, European Starling in Colorado is projected to stay roughly flat through 2030, near 13 (95% range 7.4–19). A 5-year backtest shows a typical error of ±21.3%, with 100% of held-out values landing inside the 95% band.

+2%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 →
13Projected 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 →
7.4–1995% 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 →
±21.3%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, European Starling in Colorado is projected to stay roughly flat through 2030, near 13 (95% range 7.4–19). A 5-year backtest shows a typical error of ±21.3%, 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 →
2026137.419
2027137.419
2028137.419
2029137.419
2030137.419

European Starling Survey Routes in Colorado

Routes recording European Starling 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 →
Hudson32020251988
Bennett11720251995
Fleming10220251968
Cortez 29620172009
Julesburg9220211998
Arsenal 28820252016
Fruita7120071988
Doyle Bridge6919971992
Grover6620241993
Flagler6120251997
Falfa5720251971
Alamosa5720251988
Fort Morgan5620251996
Prospect Val4420001992
Arsenal4420151991
Yampa4220231970
Moffat4220251970
Paonia4020251992
Pritchett3620251999
Animas 23520252005
Kiowa3320181968
Animas3320041996
Blackhead Pk2620251991
Gilpin2420251971
De Beque2320251993

European Starling Population Trend in Other States

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

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