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Species · Massachusetts · BBS 2026 Release · 1966–2025

Red-eyed Vireo Population Trend in Massachusetts

All statesForest birds

Red-eyed Vireo in Massachusetts has surged: up 261% on the route-weighted index since 1968.

+261%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 →
59YearsYears 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 261% 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 stay roughly flat through 2030, near 30 (95% range 20–40). A 5-year backtest shows a typical error of ±18.8%, with 80% of held-out values landing inside the 95% band.

-8%Change by 2030TrendPercent 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 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
20–4095% 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 →
±18.8%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 stay roughly flat through 2030, near 30 (95% range 20–40). A 5-year backtest shows a typical error of ±18.8%, with 80% of held-out values landing inside the 95% band.19662030
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 →
2026291939
2027291940
2028302040
2029302040
2030302040

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 →
Monterey10520252019
Chesterfield10220251967
Pittsfield9720161967
N Orange7020251968
Cummington5820141968
Ware River5420221993
Belchertown5220251967
S Barre5020251968
Hancock4920151997
Sheffield4220221969
Cummington 23920252015
Warren 23620252010
Gay Head2720251996
Princeton2019761969
Warren1720091968
Cheshire1719941969
Chilmark1019831969
Marion920251969
Prattville820191966
Maynard820251967
E Pepperell819941966
Holden720251977
Brockton620191967
Littleton620251967
Wellfleet 2520252016

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 2026-08-14.