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

Song Sparrow Population Trend in Wisconsin

All statesGeneralists

Song Sparrow in Wisconsin has edged down: down 18% on the route-weighted index since 1968.

-18%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 →
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 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 30% by 2029 — from 25 in 2024 to a central estimate of 33 (95% range 23–42). A 5-year backtest shows a typical error of ±46.8%, with 20% of held-out values landing inside the 95% band.

+30%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 →
33Projected 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 →
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 →
±46.8%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 30% by 2029 — from 25 in 2024 to a central estimate of 33 (95% range 23–42). A 5-year backtest shows a typical error of ±46.8%, with 20% 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 →
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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 →
Trempealeau7520241966
Fall River7020241966
Omro6920011966
Pardeeville6620241967
Amnicon Falls6020241998
Gilman5820241966
Holway5719891967
Raymond5420241966
N Andover5120241967
Beloit5020241998
Annaton4920241998
Bayfield4620241967
Eden4620241966
Hazel Green4320241966
N Freedom4220241966
Paris4220241966
Cumberland4020241966
Casco4020241966
Grimms4020211998
Kendall3920231967
Stratford3820241966
Clintonville3820241967
Omro 23720242002
Rolling Pr3520241966
Wis Rapids3420231966

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 2026-05-22.