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

Gray Catbird Population Trend in Wisconsin

All statesGeneralists

Gray Catbird in Wisconsin has increased: up 43% on the route-weighted index since 1968.

+43%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 Gray Catbird 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 Gray Catbird in Wisconsin. See the full index history below.

Gray Catbird Population Forecast in Wisconsin

If the recent trend holds, Gray Catbird in Wisconsin is projected to stay roughly flat through 2029, near 10 (95% range 8.4–12). A 5-year backtest shows a typical error of ±11.9%, with 80% of held-out values landing inside the 95% band.

-9%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 →
10Projected 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 →
8.4–1295% 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 →
±11.9%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, Gray Catbird in Wisconsin is projected to stay roughly flat through 2029, near 10 (95% range 8.4–12). A 5-year backtest shows a typical error of ±11.9%, with 80% 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 →
202510.08.212
2026108.312
2027108.312
2028108.412
2029108.412

Gray Catbird Survey Routes in Wisconsin

Routes recording Gray Catbird 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 →
Trempealeau4420241966
N Freedom3220241966
Highland3020241998
Fall River2920241966
Beloit2820241998
Cochrane2720241966
Pardeeville2720241967
N Andover2720241967
Union Twp2520241966
Viroqua2520241966
River Falls2320241998
Prairie Du Chien2320241998
Gilmanton2120241966
Newburg Crns2120241966
Mather2020231966
Dresser1920241966
New Lisbon1920241967
Wiota1920241966
Verona1920241991
Rolling Grnd1820241966
Eden1820241968
Hazel Green1820241966
Hebron1820241966
Cumberland1720241966
Gilman1720241966

Gray Catbird Population Trend in Other States

alabamaarizonaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.