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Species · Maryland · BBS 2026 Release · 1966–2025

Red-eyed Vireo Population Trend in Maryland

All statesForest birds

Red-eyed Vireo in Maryland has surged: up 153% on the route-weighted index since 1968.

+153%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 →
76Routes 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 MarylandNotable 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 Maryland: up 153% on the route-weighted index since 1968.

Red-eyed Vireo Population Forecast in Maryland

If the recent trend holds, Red-eyed Vireo in Maryland is projected to stay roughly flat through 2030, near 32 (95% range 26–38). A 5-year backtest shows a typical error of ±14%, with 80% of held-out values landing inside the 95% band.

+1%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 →
32Projected 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 →
26–3895% 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 →
±14%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 Maryland is projected to stay roughly flat through 2030, near 32 (95% range 26–38). A 5-year backtest shows a typical error of ±14%, 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 →
2026312537
2027312537
2028322538
2029322638
2030322638

Red-eyed Vireo Survey Routes in Maryland

Routes recording Red-eyed Vireo in Maryland.
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 →
Finzel13820251995
Jennings13120251995
Piney Grove9320251995
Oldtown9120251970
Island Creek8520251991
Green Ridge6520251995
Pomonkey5920251966
Earlton5520242014
La Plata4920091966
Accident4920171992
Hughesville4720251966
Floyd4620251966
Mt Nebo4619911969
Olney4520251966
Nottingham4520252005
Sinepuxent4319781966
Madonna4320222009
Forest Grove3920232011
Smithsburg3820141966
Accident 23720252018
Pomfret3420241966
Pt Republic3119891966
Wolfsville3020251966
Steyer3020241996
Ijamsville2920251986

Red-eyed Vireo Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.