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

House Sparrow Population Trend in Wisconsin

All statesGeneralists

House Sparrow in Wisconsin has collapsed: down 75% on the route-weighted index since 1968.

-75%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 →
93Routes 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 House Sparrow 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 →

long arc declinecomputed 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 Sparrow has collapsed in Wisconsin: down 75% on the route-weighted index since 1968.

House Sparrow Population Forecast in Wisconsin

If the recent trend holds, House Sparrow in Wisconsin is projected to fall about 39% by 2030 — from 22 in 2025 to a central estimate of 14 (95% range 0.00–35). A 5-year backtest shows a typical error of ±17.4%, with 100% of held-out values landing inside the 95% band.

-39%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 →
14Projected 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 →
0.00–3595% 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 →
±17.4%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 Sparrow in Wisconsin is projected to fall about 39% by 2030 — from 22 in 2025 to a central estimate of 14 (95% range 0.00–35). A 5-year backtest shows a typical error of ±17.4%, 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 →
2026190.0041
2027180.0040
2028170.0038
2029150.0037
2030140.0035

House Sparrow Survey Routes in Wisconsin

Routes recording House Sparrow 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 →
Eden16220251966
Grimms14820211998
Omro10520011966
N Andover10220251967
Verona6720251991
Gresham6720251998
Holway6619891967
Paris6620251966
Raymond6520251966
Beloit6320251998
Mukwonago6320041998
Holland6320251998
Prairie Du Chien6220251998
Trempealeau6020251966
Pardeeville5920251967
Brownsville5720251966
Kiel5620251998
Highland5420251998
New Lisbon5020251967
Annaton4820251998
Stratford4420251966
Manitowoc4020241966
Hazel Green4020251966
Rolling Pr3820251966
Wiota3820251966

House Sparrow 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.