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

Chipping Sparrow Population Trend in Wisconsin

All statesGeneralists

Chipping Sparrow in Wisconsin has surged: up 85% on the route-weighted index since 1968.

+85%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 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 85% 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 55% by 2029 — from 16 in 2024 to a central estimate of 25 (95% range 18–32). A 5-year backtest shows a typical error of ±66.8%, with 0% of held-out values landing inside the 95% band.

+55%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 →
25Projected 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 →
18–3295% 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 →
±66.8%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, Chipping Sparrow in Wisconsin is projected to rise about 55% by 2029 — from 16 in 2024 to a central estimate of 25 (95% range 18–32). A 5-year backtest shows a typical error of ±66.8%, with 0% 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 →
2025241731
2026241731
2027241731
2028241731
2029251832

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 →
Mukwonago4320041998
Paris4220241966
Fall River3920241966
Brownsville3920241966
Raymond3920241966
Gresham3720241998
Kiel3720221998
Land O Lakes3620161967
Eagle River3320241966
Wausaukee3320241980
Pardeeville3320241968
Irma3220241967
Hatfield3119981970
Omro3120011966
Casco3120241972
Iron River3020241967
Wis Rapids3020231966
N Freedom3020241966
Grimms2820211998
Union Twp2720241966
River Falls2620241998
Hebron2520241966
Amnicon Falls2520241998
Cumberland2420241966
Viroqua2420241966

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 2026-05-22.