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Species · Georgia · BBS 2026 Release · 1966–2025

Black-throated Green Warbler Population Trend in Georgia

All statesForest birds

Black-throated Green Warbler in Georgia has surged: up 338% on the route-weighted index since 1979.

+338%Since 1979TrendPercent 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 →
6Routes 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 →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-throated Green Warbler 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 Black-throated Green Warbler in Georgia. See the full index history below.

Black-throated Green Warbler Population Forecast in Georgia

If the recent trend holds, Black-throated Green Warbler in Georgia is projected to rise about 151% by 2030 — from 0.08 in 2025 to a central estimate of 0.19 (95% range 0.04–0.35). A 5-year backtest shows a typical error of ±111%, with 100% of held-out values landing inside the 95% band.

+151%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 →
0.19Projected 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 →
0.04–0.3595% 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 →
±111%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, Black-throated Green Warbler in Georgia is projected to rise about 151% by 2030 — from 0.08 in 2025 to a central estimate of 0.19 (95% range 0.04–0.35). A 5-year backtest shows a typical error of ±111%, with 100% of held-out values landing inside the 95% band.19752030
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 →
20260.180.030.34
20270.180.030.34
20280.190.030.34
20290.190.030.34
20300.190.040.35

Black-throated Green Warbler Survey Routes in Georgia

Routes recording Black-throated Green Warbler 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 →
Mountain Cty320251975
Pleasant Hill220252005
Baxter120221979
Amos Mill120222015
Cartersville120122012
Baldwin119981998

Black-throated Green Warbler Population Trend in Other States

alabamaarkansasconnecticutindianakentuckymainemarylandmassachusettsmichiganminnesotamissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawest-virginiawisconsin

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