BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Chimney Swift Population Trend in New Hampshire

All statesAerial insectivores

Chimney Swift in New Hampshire has fallen sharply: down 62% on the route-weighted index since 1968.

-62%Since 1968
25Routes In State
58Years

Notable Chimney Swift Trends in New Hampshire

long arc declinecomputed index

Chimney Swift has fallen sharply in New Hampshire: down 62% on the route-weighted index since 1968.

Chimney Swift Population Forecast in New Hampshire

If the recent trend holds, Chimney Swift in New Hampshire is projected to fall about 45% by 2029 — from 4.4 in 2024 to a central estimate of 2.4 (95% range 0.00–5.6). A 5-year backtest shows a typical error of ±27.2%, with 100% of held-out values landing inside the 95% band.

-45%Change by 2029
2.4Projected 2029 index
0.00–5.695% range
±27.2%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
20253.00.006.1
20262.80.006.0
20272.70.005.9
20282.60.005.8
20292.40.005.6

Chimney Swift Survey Routes in New Hampshire

Routes recording Chimney Swift in New Hampshire.
Dover2220241966
Concord1820241966
Epsom1120231966
Canterbury920241966
Gilmantn I W920241969
Fitzwilliam820221966
Strafford820241966
Lempster820241966
Mt Chocorua520241966
Crawford Not519751967
Walpole420241966
Jefferson Hl420231966
East Kingston420241999
Hopkinton320211966
Stratford320151966
Clarksville320191966
Glen320241975
Wilmot220241966
Milan220241966
Peterborough120241966
Brentwood119981966
Marlow120241966
Franconia120241966
Dixvil Notch119981966
Jeffers Ntch120161995

Chimney Swift Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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