BirdAnalyst
Species · Georgia · BBS 2026 Release · 1966–2025

Blue Grosbeak Population Trend in Georgia

All statesForest birds

Blue Grosbeak in Georgia has held roughly steady: down 8% on the route-weighted index since 1968.

-8%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 →
110Routes 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 Blue Grosbeak Trends in GeorgiaNotable 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 Grosbeak in Georgia. See the full index history below.

Blue Grosbeak Population Forecast in Georgia

If the recent trend holds, Blue Grosbeak in Georgia is projected to stay roughly flat through 2030, near 10 (95% range 8.0–13). A 5-year backtest shows a typical error of ±5.5%, with 100% of held-out values landing inside the 95% band.

+1%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 →
10Projected 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 →
8.0–1395% 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 →
±5.5%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, Blue Grosbeak in Georgia is projected to stay roughly flat through 2030, near 10 (95% range 8.0–13). A 5-year backtest shows a typical error of ±5.5%, 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 →
2026107.813
2027107.913
2028107.913
2029108.013
2030108.013

Blue Grosbeak Survey Routes in Georgia

Routes recording Blue Grosbeak in Georgia.
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 →
Fitzgerald2720251966
Owensboro2520252010
Maxeys2320241966
Workmore2320251978
Minter Tweed2320252016
Henderson2120251973
Rutledge2120251975
Baxley2020191966
Philema2020252010
Fowlstown1920161967
White Hill1920252005
Lincolnton1820171966
Athens1820251966
Boston1820251975
Rock Branch1820252005
Wadley1720251977
Union1720242011
Millen1720252006
Hawkinsville1620241966
Coffee Co1620251986
Lincolnton 21620252018
Davis Crossroads1620252012
Nashville1520251975
Doles1520221975
Lacross1520251973

Blue Grosbeak Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradodelawarefloridaidahoillinoisindianaiowakansaskentuckylouisianamarylandminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawest-virginiawyoming

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