BirdAnalyst
Species · BCR 14 · BBS 2025 Release · 1966–2024

Chimney Swift In Atlantic Northern Forest

All regionsAtlantic Northern ForestAerial insectivores

Chimney Swift in Atlantic Northern Forest has fallen sharply: down 60% on the route-weighted index since 1968.

-60%Since 1968
150Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Chimney Swift has fallen sharply in Atlantic Northern Forest: down 60% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Chimney Swift in Atlantic Northern Forest is projected to fall about 70% by 2029 — from 2.4 in 2024 to a central estimate of 0.72 (95% range 0.00–2.1). A 5-year backtest shows a typical error of ±49.8%, with 60% of held-out values landing inside the 95% band.

-70%Change by 2029
0.72Projected 2029 index
0.00–2.195% range
±49.8%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
20251.00.002.4
20260.950.002.4
20270.880.002.3
20280.800.002.2
20290.720.002.1

Routes In Atlantic Northern Forest

Routes recording Chimney Swift in Atlantic Northern Forest.
ConcordNEW-HAMPSHIRE182024
WatervilleVERMONT171980
New HartfordCONNECTICUT141987
Otisfield GrMAINE132015
NorthfieldMAINE131979
N OrangeMASSACHUSETTS132024
WaiteMAINE101977
MontereyMASSACHUSETTS102024
AuroraMAINE92013
CharlestonMAINE92019
CanterburyNEW-HAMPSHIRE92024
Gilmantn I WNEW-HAMPSHIRE92024
WestbrookMAINE82024
Pillsbury PdMAINE81968
HancockMASSACHUSETTS82014
FitzwilliamNEW-HAMPSHIRE82022
LempsterNEW-HAMPSHIRE82024
WanakenaNEW-YORK82024
CarrabassettMAINE72023
Number FourNEW-YORK71987
StoweVERMONT72024
HermonMAINE62018
HudsonMAINE62016
SearsportMAINE62024
Dexter LakeNEW-YORK61975

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