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

European Starling Population Trend in Wisconsin

All statesGeneralists

European Starling in Wisconsin has declined: down 43% on the route-weighted index since 1968.

-43%Since 1968TrendPercent 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 →
96Routes 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 →
58YearsYears 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 WisconsinNotable 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 Wisconsin. See the full index history below.

European Starling Population Forecast in Wisconsin

If the recent trend holds, European Starling in Wisconsin is projected to stay roughly flat through 2029, near 37 (95% range 17–57). A 5-year backtest shows a typical error of ±36%, with 100% of held-out values landing inside the 95% band.

-1%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 →
37Projected 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 →
17–5795% 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%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 Wisconsin is projected to stay roughly flat through 2029, near 37 (95% range 17–57). A 5-year backtest shows a typical error of ±36%, with 100% of held-out values landing inside the 95% band.19662029
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 →
2025391959
2026391959
2027381858
2028371757
2029371757

European Starling Survey Routes in Wisconsin

Routes recording European Starling in Wisconsin.
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 →
Holland25320241998
Omro19620011966
Manitowoc18020241966
Pardeeville15020241967
Stratford14720241966
Omro 214020242002
Grimms14020211998
Pt Washingtn12020241966
N Andover11420241967
Kiel11420221998
Newburg Crns11320241966
Beloit11220241998
Clintonville10720241967
Wiota10620241966
Manawa9120241966
Eden8920241966
Verona8220241991
Fall River7720241966
Mukwonago7720041998
Dresser7220241966
Mount Horeb7219901967
Paris6420241966
Annaton6320241998
Viroqua5920241966
New Lisbon5720241967

European Starling Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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