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Species · Pennsylvania · BBS 2026 Release · 1966–2025

Rose-breasted Grosbeak Population Trend in Pennsylvania

All statesForest birds

Rose-breasted Grosbeak in Pennsylvania has risen sharply: up 64% on the route-weighted index since 1968.

+64%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 →
120Routes In StateSurvey 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 Rose-breasted Grosbeak Trends in PennsylvaniaNotable 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 →

Rose-breasted Grosbeak has risen sharply in Pennsylvania: up 64% on the route-weighted index since 1968.

Rose-breasted Grosbeak Population Forecast in Pennsylvania

If the recent trend holds, Rose-breasted Grosbeak in Pennsylvania is projected to rise about 39% by 2030 — from 2.0 in 2025 to a central estimate of 2.7 (95% range 1.5–4.0). A 5-year backtest shows a typical error of ±55.4%, with 80% of held-out values landing inside the 95% band.

+39%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 →
2.7Projected 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 →
1.5–4.095% 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 →
±55.4%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 Pennsylvania is projected to rise about 39% by 2030 — from 2.0 in 2025 to a central estimate of 2.7 (95% range 1.5–4.0). A 5-year backtest shows a typical error of ±55.4%, with 80% 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 →
20262.71.54.0
20272.71.54.0
20282.71.54.0
20292.71.54.0
20302.71.54.0

Rose-breasted Grosbeak Survey Routes in Pennsylvania

Routes recording Rose-breasted Grosbeak in Pennsylvania.
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 →
Duvall1920211977
Mill Run1420251978
Rasselas1120221969
Rush1020251970
Laurel Hill920251978
Logue820251970
Harmonsburg720251966
Little Marsh720241972
Clover620251981
Akeley619761967
Betula620221973
Ravensburg619801966
Mawr Glen520251966
Marsh Hill520251983
Portersville519881973
Patton520231977
Mount Joy520061997
Tussey Mtn.520251993
Ansonia520252002
N Washington420251973
Eldred420221973
Arnot420251970
Hop Bottom420251968
Starlight419991970
Poyntelle420251973

Rose-breasted Grosbeak Population Trend in Other States

arkansasconnecticutgeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomarhode-islandsouth-dakotatennesseevermontvirginiawest-virginiawisconsinwyoming

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