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

Indigo Bunting Population Trend in Connecticut

All statesGeneralists

Indigo Bunting in Connecticut has edged down: down 14% on the route-weighted index since 1968.

-14%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 Indigo Bunting 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 Indigo Bunting in Connecticut. See the full index history below.

Indigo Bunting Population Forecast in Connecticut

If the recent trend holds, Indigo Bunting in Connecticut is projected to stay roughly flat through 2029, near 1.7 (95% range 0.00–4.6). A 5-year backtest shows a typical error of ±33.8%, with 100% of held-out values landing inside the 95% band.

-10%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 →
1.7Projected 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 →
0.00–4.695% 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 →
±33.8%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, Indigo Bunting in Connecticut is projected to stay roughly flat through 2029, near 1.7 (95% range 0.00–4.6). A 5-year backtest shows a typical error of ±33.8%, 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 →
20251.80.004.6
20261.80.004.6
20271.70.004.6
20281.70.004.6
20291.70.004.6

Indigo Bunting Survey Routes in Connecticut

Routes recording Indigo Bunting 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 →
Uncasville720241973
Long Hill720191972
Warren620111972
New Hartford419861972
Granby420241988
Mystic320231973
Danbury320171968
E Hartland219921966
Buckingham220221966
Woodstock219961969
Willimantic220181967
New Hartford220241994
Westbrook120191974
No Woodbury120241967
Sherman120191972
Greenwich120141968
Mid Haddam120241977
Southington120191973
Woodstock 2120242016
Warren 2120242022

Indigo Bunting Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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