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

House Sparrow Population Trend in Wisconsin

All statesGeneralists

House Sparrow in Wisconsin has fallen sharply: down 73% on the route-weighted index since 1968.

-73%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 →
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 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 fallen sharply in Wisconsin: down 73% 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 2029 — from 25 in 2024 to a central estimate of 15 (95% range 0.00–37). A 5-year backtest shows a typical error of ±15.1%, with 100% of held-out values landing inside the 95% band.

-39%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 →
15Projected 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 →
0.00–3795% 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 →
±15.1%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 Sparrow in Wisconsin is projected to fall about 39% by 2029 — from 25 in 2024 to a central estimate of 15 (95% range 0.00–37). A 5-year backtest shows a typical error of ±15.1%, 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 →
2025210.0043
2026190.0041
2027180.0040
2028170.0038
2029150.0037

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 →
Grimms14820211998
Eden13420241966
Kiel12420221998
Stratford12020241966
Omro10520011966
Verona9420241991
N Andover9120241967
Pardeeville8520241967
Raymond7920241966
Holland7620241998
Hazel Green7520241966
Paris7120241966
Prairie Du Chien7120241998
Trempealeau6820241966
Holway6619891967
Mukwonago6320041998
Beloit5920241998
Esdaile5520241966
Annaton5120241998
Gresham4920241998
Gilmanton4620241966
Brownsville4620241966
Cadott4320241966
Rolling Pr4220241966
Manitowoc4020241966

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 2026-05-22.