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Species · Tennessee · BBS 2025 Release · 1966–2024

Blue-headed Vireo Population Trend in Tennessee

All statesForest birds

Blue-headed Vireo in Tennessee has surged: up 14× on the route-weighted index since 1968.

14×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 →
17Routes 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 →
56YearsYears 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 TennesseeNotable 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 Tennessee: up 14× on the route-weighted index since 1968.

Blue-headed Vireo Population Forecast in Tennessee

If the recent trend holds, Blue-headed Vireo in Tennessee is projected to rise about 24% by 2029 — from 1.5 in 2024 to a central estimate of 1.8 (95% range 1.1–2.5). A 5-year backtest shows a typical error of ±22.1%, with 100% of held-out values landing inside the 95% band.

+24%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 →
1.8Projected 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 →
1.1–2.595% 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 →
±22.1%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 Tennessee is projected to rise about 24% by 2029 — from 1.5 in 2024 to a central estimate of 1.8 (95% range 1.1–2.5). A 5-year backtest shows a typical error of ±22.1%, with 100% 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 →
20251.70.932.4
20261.70.972.4
20271.71.002.5
20281.81.02.5
20291.81.12.5

Blue-headed Vireo Survey Routes in Tennessee

Routes recording Blue-headed Vireo in Tennessee.
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 →
Newfound Gap1920241990
Willis Sprng1420231994
Fish Springs1120231966
Cades Cove720241989
Tellico620241995
Harbuck520232008
Mecca420231994
Mcfarland319881971
Lewis Forest320192019
Smokey Jct120221995
Signal Mtn120051984
Oliver Spgs120162004
Jones Gap120191986
Walland119661966
Cornpone120222006
Jasper120021991
Elk Valley120221975

Blue-headed Vireo Population Trend in Other States

alabamaconnecticutgeorgiakentuckymainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinavermontvirginiawest-virginiawisconsin

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