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Species · Massachusetts · BBS 2025 Release · 1966–2024

Red-eyed Vireo Population Trend in Massachusetts

All statesForest birds

Red-eyed Vireo in Massachusetts has surged: up 251% on the route-weighted index since 1968.

+251%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 →
32Routes 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 Red-eyed Vireo Trends in MassachusettsNotable 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 →

Red-eyed Vireo has surged in Massachusetts: up 251% on the route-weighted index since 1968.

Red-eyed Vireo Population Forecast in Massachusetts

If the recent trend holds, Red-eyed Vireo in Massachusetts is projected to fall about 26% by 2029 — from 40 in 2024 to a central estimate of 30 (95% range 19–40). A 5-year backtest shows a typical error of ±19.1%, with 80% of held-out values landing inside the 95% band.

-26%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 →
30Projected 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 →
19–4095% 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 →
±19.1%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, Red-eyed Vireo in Massachusetts is projected to fall about 26% by 2029 — from 40 in 2024 to a central estimate of 30 (95% range 19–40). A 5-year backtest shows a typical error of ±19.1%, with 80% 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 →
2025291939
2026291939
2027291939
2028291940
2029301940

Red-eyed Vireo Survey Routes in Massachusetts

Routes recording Red-eyed Vireo in Massachusetts.
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 →
Chesterfield13820241967
Pittsfield9720161967
Monterey9520242019
N Orange8820241968
Belchertown6020241967
Cummington5820141968
Ware River5420221993
Hancock4920151997
Warren 24820242010
S Barre4320241968
Sheffield4220221969
Cummington 24220242015
Gay Head3120241996
Holden2120241977
Princeton2019761969
Warren1720091968
Cheshire1719941969
Chilmark1019831969
Prattville820191966
N Oxford820241968
E Pepperell819941966
Marion720241969
Maynard720221967
Brockton620191967
N. Andover620241995

Red-eyed Vireo Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsinwyoming

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