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

American Robin Population Trend in Wisconsin

All statesForest birds

American Robin in Wisconsin has risen sharply: up 58% on the route-weighted index since 1968.

+58%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 American Robin 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 →

American Robin has risen sharply in Wisconsin: up 58% on the route-weighted index since 1968.

American Robin Population Forecast in Wisconsin

If the recent trend holds, American Robin in Wisconsin is projected to stay roughly flat through 2029, near 61 (95% range 50–71). A 5-year backtest shows a typical error of ±17.2%, with 40% of held-out values landing inside the 95% band.

+3%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 →
61Projected 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 →
50–7195% 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 →
±17.2%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, American Robin in Wisconsin is projected to stay roughly flat through 2029, near 61 (95% range 50–71). A 5-year backtest shows a typical error of ±17.2%, with 40% 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 →
2025604970
2026605070
2027605070
2028605071
2029615071

American Robin Survey Routes in Wisconsin

Routes recording American Robin 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 →
Trempealeau18420241966
Paris17920241966
Raymond16620241966
Beloit14520241998
Grimms14120211998
Fall River12520241966
N Andover12420241967
Eden11220241966
Omro10920011966
Hazel Green10520241966
N Freedom10420241966
Pardeeville9920241967
River Falls9920241998
Annaton9920241998
Verona9820241991
Kiel9620221998
Mukwonago9420041998
Manitowoc8920241966
Pt Washingtn8620241966
Mukwonago 28320242005
Wiota8120241966
Hebron8120241966
Brownsville8020241966
Stratford7720241966
Omro 27420242002

American Robin 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.