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

American Robin Population Trend in Connecticut

All statesForest birds

American Robin in Connecticut has edged down: down 12% on the route-weighted index since 1968.

-12%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 →
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 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 American Robin in Connecticut. See the full index history below.

American Robin Population Forecast in Connecticut

If the recent trend holds, American Robin in Connecticut is projected to stay roughly flat through 2029, near 52 (95% range 37–66). A 5-year backtest shows a typical error of ±8.3%, with 100% of held-out values landing inside the 95% band.

+5%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 →
52Projected 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 →
37–6695% 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 →
±8.3%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 Connecticut is projected to stay roughly flat through 2029, near 52 (95% range 37–66). A 5-year backtest shows a typical error of ±8.3%, with 100% 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 →
2025523766
2026523766
2027523766
2028523766
2029523766

American Robin Survey Routes in Connecticut

Routes recording American Robin 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 →
Southington12420241973
Warren11620111972
Mystic8820231973
Woodstock8820071968
Uncasville7420241973
E Hartland6919921966
Woodstock 26020242016
Long Hill5820191972
Greenwich5420181967
Westbrook4920241969
Danbury4320231968
Willimantic4020181967
Buckingham3620221966
Mid Haddam3220241973
New Hartford3220241994
Warren 22720242012
New Hartford2619871972
No Woodbury2320241967
Granby2220241988
Sherman2020191972

American Robin Population Trend in Other States

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

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