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Species · Maine · BBS 2025 Release · 1966–2024

Blue-headed Vireo Population Trend in Maine

All statesForest birds

Blue-headed Vireo in Maine has surged: up 253% on the route-weighted index since 1968.

+253%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 →
78Routes 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 Blue-headed Vireo Trends in MaineNotable 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 Maine: up 253% on the route-weighted index since 1968.

Blue-headed Vireo Population Forecast in Maine

If the recent trend holds, Blue-headed Vireo in Maine is projected to rise about 58% by 2029 — from 3.5 in 2024 to a central estimate of 5.5 (95% range 2.7–8.3). A 5-year backtest shows a typical error of ±33.6%, with 100% of held-out values landing inside the 95% band.

+58%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 →
5.5Projected 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 →
2.7–8.395% 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 →
±33.6%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 Maine is projected to rise about 58% by 2029 — from 3.5 in 2024 to a central estimate of 5.5 (95% range 2.7–8.3). A 5-year backtest shows a typical error of ±33.6%, 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 →
20255.32.48.1
20265.32.58.2
20275.42.58.2
20285.42.68.3
20295.52.78.3

Blue-headed Vireo Survey Routes in Maine

Routes recording Blue-headed Vireo in Maine.
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 →
Northfield4719811976
Nesowadnehun2320211992
Carrying Pl1920241979
Wilson Mills1520241983
Seboomook Lk1520141978
Castine1420061977
Clayton Lake1420081977
Grnd Lk Strm1320001966
Baker Lake 21220112010
Cooper1020211975
Charleston1020191977
Forest Sta1020001966
Yankeetuladi1020091994
Brooks920191977
Telos920061995
Baker Lake920091994
Topsfield919961978
Big Twenty 2920092009
Waite819771977
St David820051982
Big Twenty820081993
Eastbrook720241977
Aurora720211975
Pillsbury Pd719681968
Ashland720061980

Blue-headed Vireo Population Trend in Other States

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

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