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Species · Maryland · BBS 2025 Release · 1966–2024

Yellow-throated Vireo Population Trend in Maryland

All statesForest birds

Yellow-throated Vireo in Maryland has surged: up 146% on the route-weighted index since 1968.

+146%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 →
73Routes 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 Yellow-throated 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 →

Yellow-throated Vireo has surged in Maryland: up 146% on the route-weighted index since 1968.

Yellow-throated Vireo Population Forecast in Maryland

If the recent trend holds, Yellow-throated Vireo in Maryland is projected to stay roughly flat through 2029, near 1.6 (95% range 1.0–2.2). A 5-year backtest shows a typical error of ±31.9%, with 40% of held-out values landing inside the 95% band.

-9%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 →
1.6Projected 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 →
1.0–2.295% 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 →
±31.9%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, Yellow-throated Vireo in Maryland is projected to stay roughly flat through 2029, near 1.6 (95% range 1.0–2.2). A 5-year backtest shows a typical error of ±31.9%, with 40% 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 →
20251.50.962.1
20261.60.972.1
20271.60.992.2
20281.61.02.2
20291.61.02.2

Yellow-throated Vireo Survey Routes in Maryland

Routes recording Yellow-throated 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 →
Oldtown1420241970
Madonna1020222009
Pomonkey820241967
Pomfret720241966
Piney Grove620241995
Forest Grove520232011
Furnace Town420242015
Indiantown420141977
Davidsnville420241982
Eklo320181972
Finzel320241995
Green Ridge320241995
Berlin320241980
Ijamsville320231990
Island Creek320241991
Potomac Park220241970
Smithsburg220131967
Emmitsburg220221991
Olney220241966
Largo219751966
Hughesville220241979
Elkton220231966
Millington220241976
Snow Hill219731966
Jennings220241995

Yellow-throated Vireo Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

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