BirdAnalyst
Species · Georgia · BBS 2025 Release · 1966–2024

Blue Grosbeak Population Trend in Georgia

All statesGeneralists

Blue Grosbeak in Georgia has held roughly steady: down 9% on the route-weighted index since 1968.

-9%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 →
109Routes 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 →
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 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 rise about 15% by 2029 — from 9.0 in 2024 to a central estimate of 10 (95% range 7.9–13). A 5-year backtest shows a typical error of ±6%, with 100% of held-out values landing inside the 95% band.

+15%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 →
7.9–1395% 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 →
±6%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 rise about 15% by 2029 — from 9.0 in 2024 to a central estimate of 10 (95% range 7.9–13). A 5-year backtest shows a typical error of ±6%, with 100% 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 →
2025107.813
2026107.813
2027107.813
2028107.913
2029107.913

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 →
Wadley2520241977
Workmore2420191978
Maxeys2320241966
Boston2320241975
White Hill2320242005
Fitzgerald2220241966
Baxley2020191966
Pitts2020241977
Rock Branch2020242005
Fowlstown1920161967
Wrightsville1920241966
Union1920232011
Lincolnton1820171966
Rutledge1820241975
Philema1820242010
Cuthbert1620241967
Hawkinsville1620241966
Finleyson1620241977
Minter Tweed1620242016
Doles1520221975
Rentz1520241977
Lincolnton 21520242018
Nashville1420241975
Deepstep1320231975
Vidalia1320241995

Blue Grosbeak Population Trend in Other States

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

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