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

Chimney Swift Population Trend in Vermont

All statesAerial insectivores

Chimney Swift in Vermont has collapsed: down 77% on the route-weighted index since 1968.

-77%Since 1968
26Routes In State
58Years

Notable Chimney Swift Trends in Vermont

long arc declinecomputed index

Chimney Swift has collapsed in Vermont: down 77% on the route-weighted index since 1968.

Chimney Swift Population Forecast in Vermont

If the recent trend holds, Chimney Swift in Vermont is projected to fall about 42% by 2029 — from 1.1 in 2024 to a central estimate of 0.64 (95% range 0.00–2.2). A 5-year backtest shows a typical error of ±38.4%, with 100% of held-out values landing inside the 95% band.

-42%Change by 2029
0.64Projected 2029 index
0.00–2.295% range
±38.4%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
20250.880.002.4
20260.820.002.4
20270.760.002.3
20280.700.002.3
20290.640.002.2

Chimney Swift Survey Routes in Vermont

Routes recording Chimney Swift in Vermont.
Waterville1719801967
Stowe720241991
Marlboro620241966
Northfld Fls620131987
North Pownal520191966
Newbury520041987
Post Mills420221966
Greensboro420241968
Hinesburg419921973
Bristol420091995
Landgrove320221967
Gaysville320191966
Fletcher320221968
Shaftsbury220231966
East Haven220081966
Middlesex220211968
East Calais220231966
Colchester220141986
Newbury 2220082005
Stratton120241966
S Reading120231966
S Wallingfrd120221966
W Rutland120241966
St Johnsbury120191970
Hardwick120241967

Chimney Swift Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvirginiawest-virginiawisconsinwyoming

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