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Species · Georgia · BBS 2025 Release · 1966–2024

Black-throated Green Warbler Population Trend in Georgia

All statesForest birds

Black-throated Green Warbler in Georgia has surged: up 532% on the route-weighted index since 1979.

+532%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 →
43YearsYears 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 →

long arc increasecomputed 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 →

Black-throated Green Warbler has surged in Georgia: up 532% on the route-weighted index since 1979.

Black-throated Green Warbler Population Forecast in Georgia

If the recent trend holds, Black-throated Green Warbler in Georgia is projected to rise about 31% by 2029 — from 0.15 in 2024 to a central estimate of 0.20 (95% range 0.05–0.35). A 5-year backtest shows a typical error of ±169.3%, with 60% of held-out values landing inside the 95% band.

+31%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 →
0.20Projected 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 →
0.05–0.3595% 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 →
±169.3%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 31% by 2029 — from 0.15 in 2024 to a central estimate of 0.20 (95% range 0.05–0.35). A 5-year backtest shows a typical error of ±169.3%, with 60% of held-out values landing inside the 95% band.19752029
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 →
20250.190.030.34
20260.190.040.34
20270.190.040.35
20280.200.040.35
20290.200.050.35

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 Cty920241975
Baxter120221979
Pleasant Hill120242005
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 2026-05-22.