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Species · BCR 14 · BBS 2026 Release · 1966–2025

Rose-breasted Grosbeak In Atlantic Northern Forest

All regionsAtlantic Northern ForestForest birds

Rose-breasted Grosbeak in Atlantic Northern Forest has fallen sharply: down 62% on the route-weighted index since 1968.

-62%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 →
154Routes 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 →

long arc declinecomputed 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 →

Rose-breasted Grosbeak has fallen sharply in Atlantic Northern Forest: down 62% on the route-weighted index since 1968.

Rose-breasted Grosbeak In Atlantic Northern Forest Population Forecast

If the recent trend holds, Rose-breasted Grosbeak in Atlantic Northern Forest is projected to fall about 45% by 2030 — from 1.0 in 2025 to a central estimate of 0.58 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±11.5%, with 100% of held-out values landing inside the 95% band.

-45%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 →
0.58Projected 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 →
0.00–3.595% 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 →
±11.5%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 Atlantic Northern Forest is projected to fall about 45% by 2030 — from 1.0 in 2025 to a central estimate of 0.58 (95% range 0.00–3.5). A 5-year backtest shows a typical error of ±11.5%, 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 →
20260.900.003.8
20270.820.003.7
20280.740.003.6
20290.660.003.5
20300.580.003.5

Routes In Atlantic Northern Forest

Routes recording Rose-breasted Grosbeak 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 →
Dexter LakeNEW-YORK351975
NorthfieldMAINE291981
WaiteMAINE121977
New HartfordCONNECTICUT71987
BentonMAINE71980
Pillsbury PdMAINE71968
WashburnMAINE72005
Clayton Lake 2MAINE72013
WatervilleVERMONT71980
WestbrookMAINE62024
TurnerMAINE62002
ManchesterMAINE61995
BaxterMAINE61988
SheffieldMASSACHUSETTS62022
SciotaNEW-YORK62006
WarrenMAINE51990
Ft FairfieldMAINE52005
SabattisNEW-YORK51983
W RutlandVERMONT52025
NewburyVERMONT52004
Otisfield GrMAINE42015
LudlowMAINE41998
Priestly Br.MAINE42013
JeffersonMAINE42009
Baker Lake 2MAINE42013

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