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

Blue-winged Warbler In Atlantic Northern Forest

All regionsAtlantic Northern ForestForest birds

Blue-winged Warbler in Atlantic Northern Forest has held roughly steady: up 4% on the route-weighted index since 1969.

+4%Since 1969TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
23Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Blue-winged Warbler in Atlantic Northern Forest. See the full index history below.

Blue-winged Warbler In Atlantic Northern Forest Population Forecast

If the recent trend holds, Blue-winged Warbler in Atlantic Northern Forest is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±50%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.01Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0895% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±50%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Blue-winged Warbler in Atlantic Northern Forest is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±50%, with 100% of held-out values landing inside the 95% band.19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.020.000.08
20260.010.000.08
20270.010.000.08
20280.010.000.08
20290.010.000.08

Routes In Atlantic Northern Forest

Routes recording Blue-winged Warbler in Atlantic Northern Forest.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
NewcombNEW-YORK32013
New HartfordCONNECTICUT21987
HopkintonNEW-HAMPSHIRE21996
KasoagNEW-YORK21993
FletcherVERMONT22022
New HartfordCONNECTICUT12006
N OrangeMASSACHUSETTS11999
CummingtonMASSACHUSETTS11997
ChesterfieldMASSACHUSETTS11996
CheshireMASSACHUSETTS11991
PittsfieldMASSACHUSETTS12006
SheffieldMASSACHUSETTS12013
MontereyMASSACHUSETTS12024
Cummington 2MASSACHUSETTS12022
FitzwilliamNEW-HAMPSHIRE11982
ConcordNEW-HAMPSHIRE11998
Mt ChocoruaNEW-HAMPSHIRE11975
FranconiaNEW-HAMPSHIRE11968
PetersburgNEW-YORK12010
HighmarketNEW-YORK11984
Underwood 2NEW-YORK12009
S WallingfrdVERMONT11999
W RutlandVERMONT12017

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