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Species · Alabama · BBS 2025 Release · 1966–2024

Blue-headed Vireo Population Trend in Alabama

All statesForest birds

Blue-headed Vireo in Alabama has surged: up 287% on the route-weighted index since 1990.

+287%Since 1990TrendPercent 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 →
8Routes 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 →
34YearsYears 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-headed Vireo Trends in AlabamaNotable 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 →

Blue-headed Vireo has surged in Alabama: up 287% on the route-weighted index since 1990.

Blue-headed Vireo Population Forecast in Alabama

If the recent trend holds, Blue-headed Vireo in Alabama is projected to stay roughly flat through 2029, near 0.21 (95% range 0.06–0.37). A 5-year backtest shows a typical error of ±101.6%, with 80% of held-out values landing inside the 95% band.

+1%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 →
0.21Projected 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 →
0.06–0.3795% 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 →
±101.6%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-headed Vireo in Alabama is projected to stay roughly flat through 2029, near 0.21 (95% range 0.06–0.37). A 5-year backtest shows a typical error of ±101.6%, with 80% of held-out values landing inside the 95% band.19692029
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 →
20250.200.040.35
20260.200.050.35
20270.200.050.36
20280.210.060.36
20290.210.060.37

Blue-headed Vireo Survey Routes in Alabama

Routes recording Blue-headed Vireo in Alabama.
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 →
Borden Springs 2720242001
Sunny Eve420241969
Woodville120242024
Lakeview120122012
Choccolocco120231996
Maytown120132012
Wedowee120082000
Odenville120091996

Blue-headed Vireo Population Trend in Other States

connecticutgeorgiakentuckymainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawest-virginiawisconsin

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