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

Song Sparrow Population Trend in Wisconsin

All statesForest birds

Song Sparrow in Wisconsin has edged down: down 13% on the route-weighted index since 1968.

-13%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 →
98Routes 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 Song 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 →

No notable trend signals for Song Sparrow in Wisconsin. See the full index history below.

Song Sparrow Population Forecast in Wisconsin

If the recent trend holds, Song Sparrow in Wisconsin is projected to rise about 17% by 2030 — from 28 in 2025 to a central estimate of 32 (95% range 23–42). A 5-year backtest shows a typical error of ±50.1%, with 0% of held-out values landing inside the 95% band.

+17%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 →
32Projected 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 →
23–4295% 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 →
±50.1%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, Song Sparrow in Wisconsin is projected to rise about 17% by 2030 — from 28 in 2025 to a central estimate of 32 (95% range 23–42). A 5-year backtest shows a typical error of ±50.1%, with 0% 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 →
2026322342
2027322342
2028322342
2029322342
2030322342

Song Sparrow Survey Routes in Wisconsin

Routes recording Song 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 →
Omro6920011966
Pardeeville6920251967
Annaton6620251998
Fall River6220251966
Stetsonville6120251990
Holway5719891967
Gilman5620251966
N Freedom5620251966
Brownsville5320251966
Casco5020251966
Hazel Green5020251966
Kendall4920251967
Trempealeau4820251966
N Andover4820251967
Paris4720251966
Amnicon Falls4720251998
Beloit4720251998
Wiota4420251966
Raymond4120251966
Bayfield4020251967
Buena Vista4020251998
Grimms4020211998
Highland4020251998
Kiel4020251998
Weirgor Springs3920251999

Song Sparrow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawyoming

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