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

Cliff Swallow Population Trend in Vermont

All statesAerial insectivores

Cliff Swallow in Vermont has collapsed: down 82% on the route-weighted index since 1968.

-82%Since 1968
25Routes In State
57Years

Notable Cliff Swallow Trends in Vermont

long arc declinecomputed index

Cliff Swallow has collapsed in Vermont: down 82% on the route-weighted index since 1968.

Cliff Swallow Population Forecast in Vermont

If the recent trend holds, Cliff Swallow in Vermont is projected to fall about 100% by 2029 — from 0.22 in 2024 to a central estimate of 0.00 (95% range 0.00–2.2). A 5-year backtest shows a typical error of ±76.8%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–2.295% range
±76.8%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
20250.000.002.2
20260.000.002.2
20270.000.002.2
20280.000.002.2
20290.000.002.2

Cliff Swallow Survey Routes in Vermont

Routes recording Cliff Swallow in Vermont.
Northfld Fls1919801980
Stowe819921992
Hardwick619941973
Grand Isle619851969
Gaysville520171979
S Wallingfrd420211980
St Johnsbury420221971
Newbury419981986
East Calais320121966
Greensboro319991967
Landgrove220171966
Shaftsbury220051968
Middlesex220241970
Waterville219801968
Colchester219981991
Marlboro119721968
North Pownal119661966
Stratton120191969
S Reading120081969
Post Mills120241967
W Rutland120091970
East Haven120241968
Fletcher120131968
Hinesburg119941969
Bristol120002000

Cliff Swallow Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawashingtonwest-virginiawisconsinwyoming

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