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

Common Grackle Population Trend in Georgia

All statesGeneralists

Common Grackle in Georgia has collapsed: down 79% on the route-weighted index since 1968.

-79%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 →
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 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 79% 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 98% by 2029 — from 12 in 2024 to a central estimate of 0.23 (95% range 0.00–8.4). A 5-year backtest shows a typical error of ±60.2%, with 60% of held-out values landing inside the 95% band.

-98%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 →
0.23Projected 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 →
0.00–8.495% 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 →
±60.2%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 98% by 2029 — from 12 in 2024 to a central estimate of 0.23 (95% range 0.00–8.4). A 5-year backtest shows a typical error of ±60.2%, with 60% 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 →
20253.60.0012
20262.80.0011
20271.90.0010
20281.10.009.2
20290.230.008.4

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 →
Rock Branch13420242005
Metasville7020001997
Weber6220242013
Fitzgerald4320241966
Ware Co4320241986
Douglas4219841978
Henderson4120241973
Guyton3719931966
Hollonville3120031973
Ousley3120242015
Lakeview3120242006
Crest3020231973
Fairplay2819911966
Newton2720241975
Keller2519941975
Wrightsville2020241966
Tarver1920241991
Glenmore1920242013
Waycross1819841970
Big Oak1820242007
Shiloh1820242012
Lyons1719941966
Coffee Co1720241986
Everett City1620191976
Hiram1520181975

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 2026-05-22.