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Species · Connecticut · BBS 2026 Release · 1966–2025

Gray Catbird Population Trend in Connecticut

All statesForest birds

Gray Catbird in Connecticut has increased: up 47% on the route-weighted index since 1968.

+47%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 →
20Routes 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 ConnecticutNotable 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 Connecticut. See the full index history below.

Gray Catbird Population Forecast in Connecticut

If the recent trend holds, Gray Catbird in Connecticut is projected to rise about 25% by 2030 — from 36 in 2025 to a central estimate of 45 (95% range 32–58). A 5-year backtest shows a typical error of ±25.4%, with 100% of held-out values landing inside the 95% band.

+25%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 →
45Projected 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 →
32–5895% 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 →
±25.4%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 Connecticut is projected to rise about 25% by 2030 — from 36 in 2025 to a central estimate of 45 (95% range 32–58). A 5-year backtest shows a typical error of ±25.4%, with 100% 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 →
2026433056
2027443157
2028443157
2029453258
2030453258

Gray Catbird Survey Routes in Connecticut

Routes recording Gray Catbird in Connecticut.
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 →
Warren13720111972
Uncasville6320251973
Sherman5620191972
Mid Haddam5620251973
Willimantic5420181967
Long Hill5020191972
Southington3920251973
Woodstock 23420252016
Danbury3220231968
Westbrook3120251969
Warren 22720252012
Mystic2620231973
Buckingham2520221966
New Hartford2419871972
Greenwich2220181967
No Woodbury1920251967
Granby1920251988
Woodstock1620071968
E Hartland1019921966
New Hartford1020241994

Gray Catbird Population Trend in Other States

alabamaarizonaarkansascoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.