BirdAnalyst
Species · BCR 30 · BBS 2026 Release · 1966–2025

Rose-breasted Grosbeak In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastForest birds

Rose-breasted Grosbeak in New England / Mid-Atlantic Coast has declined: down 39% on the route-weighted index since 1968.

-39%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 →
67Routes 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 →
59YearsYears 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 Rose-breasted Grosbeak in New England / Mid-Atlantic Coast. See the full index history below.

Rose-breasted Grosbeak In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Rose-breasted Grosbeak in New England / Mid-Atlantic Coast is projected to fall about 62% by 2030 — from 0.81 in 2025 to a central estimate of 0.30 (95% range 0.00–1.0). A 5-year backtest shows a typical error of ±50.1%, with 100% of held-out values landing inside the 95% band.

-62%Change by 2030TrendPercent 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 →
0.30Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–1.095% 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 →
±50.1%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, Rose-breasted Grosbeak in New England / Mid-Atlantic Coast is projected to fall about 62% by 2030 — from 0.81 in 2025 to a central estimate of 0.30 (95% range 0.00–1.0). A 5-year backtest shows a typical error of ±50.1%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.390.001.1
20270.370.001.1
20280.350.001.1
20290.330.001.1
20300.300.001.0

Routes In New England / Mid-Atlantic Coast

Routes recording Rose-breasted Grosbeak 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 →
WillimanticCONNECTICUT82018
N OxfordMASSACHUSETTS72025
Woodstock 2CONNECTICUT62025
MaynardMASSACHUSETTS62025
Long HillCONNECTICUT52019
S BarreMASSACHUSETTS52025
Warren 2MASSACHUSETTS52025
HuntingtonNEW-YORK51981
BuckinghamCONNECTICUT42022
No WoodburyCONNECTICUT42025
BelchertownMASSACHUSETTS42025
East KingstonNEW-HAMPSHIRE42025
E HartlandCONNECTICUT31992
UncasvilleCONNECTICUT32025
WestbrookCONNECTICUT32024
ShermanCONNECTICUT32019
WarrenCONNECTICUT32011
GranbyCONNECTICUT32025
WarrenMASSACHUSETTS32009
EpsomNEW-HAMPSHIRE32021
StraffordNEW-HAMPSHIRE32025
WesthamptonNEW-YORK31987
WoodstockCONNECTICUT22007
GreenwichCONNECTICUT22018
DanburyCONNECTICUT22016

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.