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

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 →
59YearsYears 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 rise about 15% by 2030 — from 31 in 2025 to a central estimate of 35 (95% range 16–55). A 5-year backtest shows a typical error of ±30.6%, with 100% of held-out values landing inside the 95% band.

+15%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 →
35Projected 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 →
16–5595% 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 →
±30.6%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 rise about 15% by 2030 — from 31 in 2025 to a central estimate of 35 (95% range 16–55). A 5-year backtest shows a typical error of ±30.6%, with 100% of held-out values landing inside the 95% band.19662030
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 →
2026381858
2027371857
2028371757
2029361656
2030351655

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 →
Omro19620011966
Manitowoc18020241966
Eden16320251966
Beloit15820251998
Grimms14020211998
Pt Washingtn12020241966
Pardeeville10420251967
N Andover8820251967
Brownsville8220251966
Gresham8120251998
Holland7920251998
Mukwonago7720041998
Clintonville7520251967
Stratford7420251966
Mount Horeb7219901967
Paris7120251966
Trempealeau7020251966
Fall River6320251966
Hebron6220251966
Wiota6120251966
Hudson6020251966
Viroqua5920241966
Esdaile5620251966
Hazel Green5220251966
Mukwonago 25220252005

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 2026-08-14.