BirdAnalyst
Species · BCR 30 · BBS 2025 Release · 1966–2024

Pine Warbler In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastForest birds

Pine Warbler in New England / Mid-Atlantic Coast has surged: up 421% on the route-weighted index since 1968.

+421%Since 1968TrendPercent 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 →
148Routes 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 →
58YearsYears 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Pine Warbler has surged in New England / Mid-Atlantic Coast: up 421% on the route-weighted index since 1968.

Pine Warbler In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Pine Warbler in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 10 (95% range 7.6–13). A 5-year backtest shows a typical error of ±14.1%, with 80% of held-out values landing inside the 95% band.

-7%Change 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 →
10Projected 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 →
7.6–1395% 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 →
±14.1%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, Pine Warbler in New England / Mid-Atlantic Coast is projected to stay roughly flat through 2029, near 10 (95% range 7.6–13). A 5-year backtest shows a typical error of ±14.1%, with 80% of held-out values landing inside the 95% band.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 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 →
20259.77.112
20269.97.313
2027107.413
2028107.513
2029107.613

Routes In New England / Mid-Atlantic Coast

Routes recording Pine Warbler in New England / Mid-Atlantic Coast.
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 →
Spraguetown 3NEW-JERSEY752024
MadisonMARYLAND622024
Casimir Pulaski SfRHODE-ISLAND522018
FriendshipNEW-JERSEY482024
PomonaNEW-JERSEY462024
CokesburyMARYLAND432024
Wellfleet 2MASSACHUSETTS402024
Furnace TownMARYLAND352024
TruhartVIRGINIA352024
BrandonVIRGINIA312024
WalkersVIRGINIA292023
MarionMASSACHUSETTS282024
WinslowNEW-JERSEY252024
Cape Cod NsMASSACHUSETTS242007
Ware RiverMASSACHUSETTS232022
Estell ManorNEW-JERSEY222022
PepperboxDELAWARE202016
HongaMARYLAND192024
Forest GroveMARYLAND192023
PrattvilleMASSACHUSETTS172019
MaynardMASSACHUSETTS172022
HoldenMASSACHUSETTS172024
StraffordNEW-HAMPSHIRE172024
GloucesterVIRGINIA172024
MillsboroDELAWARE162024

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