BirdAnalyst
Species · Delaware · BBS 2026 Release · 1966–2025

White-eyed Vireo Population Trend in Delaware

All statesForest birds

White-eyed Vireo in Delaware has increased: up 38% on the route-weighted index since 1968.

+38%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 →
17Routes 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 White-eyed Vireo Trends in DelawareNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for White-eyed Vireo in Delaware. See the full index history below.

White-eyed Vireo Population Forecast in Delaware

If the recent trend holds, White-eyed Vireo in Delaware is projected to fall about 38% by 2030 — from 5.2 in 2025 to a central estimate of 3.2 (95% range 0.63–5.8). A 5-year backtest shows a typical error of ±43%, with 60% of held-out values landing inside the 95% band.

-38%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 →
3.2Projected 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 →
0.63–5.895% 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 →
±43%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, White-eyed Vireo in Delaware is projected to fall about 38% by 2030 — from 5.2 in 2025 to a central estimate of 3.2 (95% range 0.63–5.8). A 5-year backtest shows a typical error of ±43%, with 60% 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 →
20263.30.745.9
20273.30.715.8
20283.30.685.8
20293.20.665.8
20303.20.635.8

White-eyed Vireo Survey Routes in Delaware

Routes recording White-eyed Vireo in Delaware.
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 →
Millsboro1720252017
Pepperbox620161998
Frederica520251966
Holleyville420041966
Milton420151966
Pepperbox 2420252017
Harrington320251966
Dover319871968
Frankford320121966
Lowes Xrds319911966
Blackbird320241994
Georgetown320221992
Mt Pleasant220181966
Wilmington220101969
Holleyville 2220242006
Milton 2220252017
Bethany Bch119901966

White-eyed Vireo Population Trend in Other States

alabamaarkansasconnecticutfloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganmississippimissourinebraskanew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvirginiawest-virginiawisconsin

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