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

Black-throated Green Warbler Population Trend in New Hampshire

All statesForest birds

Black-throated Green Warbler in New Hampshire has surged: up 159% on the route-weighted index since 1968.

+159%Since 1968
26Routes In State
58Years

Notable Black-throated Green Warbler Trends in New Hampshire

long arc increasecomputed index

Black-throated Green Warbler has surged in New Hampshire: up 158% on the route-weighted index since 1968.

Black-throated Green Warbler Population Forecast in New Hampshire

If the recent trend holds, Black-throated Green Warbler in New Hampshire is projected to rise about 64% by 2029 — from 3.4 in 2024 to a central estimate of 5.5 (95% range 2.9–8.1). A 5-year backtest shows a typical error of ±99.5%, with 20% of held-out values landing inside the 95% band.

+64%Change by 2029
5.5Projected 2029 index
2.9–8.195% range
±99.5%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
20255.22.77.8
20265.32.77.9
20275.42.87.9
20285.42.98.0
20295.52.98.1

Black-throated Green Warbler Survey Routes in New Hampshire

Routes recording Black-throated Green Warbler in New Hampshire.
Dixvil Notch1520171966
Dixville Notch 21320242018
Clarksville1120241969
Walpole720241967
Jeffers Ntch620241993
Canterbury520241966
Wilmot520241969
Franconia520241966
Fitzwilliam420241966
Mt Chocorua420241966
Jefferson Hl420241966
Lempster320241972
Peterborough220241968
Brentwood219961968
Hopkinton220231966
Stratford220211971
Glen220241975
East Kingston220172000
Dover120211966
Epsom120231969
Concord120191967
Strafford120241966
Gilmantn I W120241969
Marlow120241966
Crawford Not119751967

Black-throated Green Warbler Population Trend in Other States

alabamaarkansasconnecticutgeorgiaindianakentuckymainemarylandmassachusettsmichiganminnesotamissourinew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawest-virginiawisconsin

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