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

Gray Catbird Population Trend in Wisconsin

All statesForest birds

Gray Catbird in Wisconsin has increased: up 48% on the route-weighted index since 1968.

+48%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 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 fall about 12% by 2030 — from 12 in 2025 to a central estimate of 10 (95% range 8.6–12). A 5-year backtest shows a typical error of ±11.5%, with 60% of held-out values landing inside the 95% band.

-12%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 →
10Projected 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 →
8.6–1295% 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 →
±11.5%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 fall about 12% by 2030 — from 12 in 2025 to a central estimate of 10 (95% range 8.6–12). A 5-year backtest shows a typical error of ±11.5%, with 60% 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 →
2026108.312
2027108.412
2028108.512
2029108.512
2030108.612

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 →
Beloit3720251998
N Andover3420251967
Hazel Green3420251966
Newburg Crns3320251966
N Freedom3120251966
Highland2820251998
Trempealeau2720251966
Viroqua2520241966
Gilman2420251966
Meridean2420251998
Annaton2420251998
Pardeeville2320251967
Bashaw2320251998
Kendall2220251967
Wiota2220251966
Weyerhauser2120251966
Gresham2120251998
Mather2020231966
Weirgor Springs2020251999
Rolling Grnd1920251966
Fall River1920251966
River Falls1920251998
Briggsville1820251999
Cochrane1720251966
Hebron1720251966

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 2026-08-14.