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

Common Grackle Population Trend in Georgia

All statesGeneralists

Common Grackle in Georgia has collapsed: down 83% on the route-weighted index since 1968.

-83%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 →
111Routes 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 Common Grackle 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 →

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 →

Common Grackle has collapsed in Georgia: down 83% on the route-weighted index since 1968.

Common Grackle Population Forecast in Georgia

If the recent trend holds, Common Grackle in Georgia is projected to fall about 100% by 2030 — from 7.5 in 2025 to a central estimate of 0.00 (95% range 0.00–8.1). A 5-year backtest shows a typical error of ±69%, with 60% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–8.195% 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 →
±69%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, Common Grackle in Georgia is projected to fall about 100% by 2030 — from 7.5 in 2025 to a central estimate of 0.00 (95% range 0.00–8.1). A 5-year backtest shows a typical error of ±69%, with 60% 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 →
20263.00.0011
20272.20.0010
20281.40.009.5
20290.510.008.7
20300.000.008.1

Common Grackle Survey Routes in Georgia

Routes recording Common Grackle 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 →
Metasville7020001997
Douglas4219841978
Guyton3719931966
Ware Co3420251986
Hollonville3120031973
Fairplay2819911966
Wrightsville2720251966
Ousley2720252015
Keller2519941975
Fitzgerald2320251966
Lincolnton 22220252018
Shiloh1920252012
Waycross1819841970
Lyons1719941966
Owensboro1720252010
Rock Branch1720252005
Everett City1620191976
Newton1620251975
White Hill1620252005
Hiram1520181975
Wadley1520251977
Tarver1520251991
Colonels Island1420232005
Lincolnton1320171966
Siloam1220241967

Common Grackle Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawarefloridaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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