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

Chipping Sparrow Population Trend in Wisconsin

All statesForest birds

Chipping Sparrow in Wisconsin has surged: up 86% on the route-weighted index since 1968.

+86%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 Chipping 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 increasecomputed 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 →

Chipping Sparrow has surged in Wisconsin: up 86% on the route-weighted index since 1968.

Chipping Sparrow Population Forecast in Wisconsin

If the recent trend holds, Chipping Sparrow in Wisconsin is projected to rise about 57% by 2030 — from 15 in 2025 to a central estimate of 24 (95% range 17–31). A 5-year backtest shows a typical error of ±72.2%, with 0% of held-out values landing inside the 95% band.

+57%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 →
24Projected 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 →
17–3195% 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 →
±72.2%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, Chipping Sparrow in Wisconsin is projected to rise about 57% by 2030 — from 15 in 2025 to a central estimate of 24 (95% range 17–31). A 5-year backtest shows a typical error of ±72.2%, 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 →
2026231631
2027241631
2028241731
2029241731
2030241731

Chipping Sparrow Survey Routes in Wisconsin

Routes recording Chipping 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 →
Gresham4520251998
Mukwonago4320041998
Fall River4120251966
Land O Lakes3620161967
Bashaw3620251998
N Freedom3420251966
Paris3420251966
Pardeeville3320251968
Eagle River3220251966
Hatfield3119981970
Omro3120011966
Wis Rapids3020231966
Holland2920251998
Casco2820251972
Grimms2820211998
Raymond2720251966
Loraine2620251966
Wiota2620251966
Land O' Lakes 22620252017
River Falls2520251998
Iron River2420251967
Phillips2420251966
Viroqua2420241966
Stevens Pt2220231966
Omro 22220252002

Chipping 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.