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

Chimney Swift Population Trend in Connecticut

All statesAerial insectivores

Chimney Swift in Connecticut has increased: up 34% on the route-weighted index since 1968.

+34%Since 1968
20Routes In State
58Years

Notable Chimney Swift Trends in Connecticut

No notable trend signals for Chimney Swift in Connecticut. See the full index history below.

Chimney Swift Population Forecast in Connecticut

If the recent trend holds, Chimney Swift in Connecticut is projected to stay roughly flat through 2029, near 6.7 (95% range 3.4–9.9). A 5-year backtest shows a typical error of ±27.5%, with 100% of held-out values landing inside the 95% band.

+9%Change by 2029
6.7Projected 2029 index
3.4–9.995% range
±27.5%Backtest error
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 index95% low95% high
20256.73.49.9
20266.73.49.9
20276.73.49.9
20286.73.49.9
20296.73.49.9

Chimney Swift Survey Routes in Connecticut

Routes recording Chimney Swift in Connecticut.
Willimantic1720181967
E Hartland1519921966
Mid Haddam1520241973
New Hartford1419871972
Long Hill1320191973
Uncasville920241977
Southington920241973
Sherman820191972
Greenwich720181968
Granby720241988
Mystic620231973
Westbrook620241969
New Hartford520241994
Danbury420231968
Buckingham320161966
No Woodbury220241967
Woodstock 2220242018
Warren 2220212012
Woodstock120071968
Warren120111973

Chimney Swift Population Trend in Other States

alabamaarkansascoloradodelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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