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Species · Illinois · BBS 2026 Release · 1966–2025

White-eyed Vireo Population Trend in Illinois

All statesForest birds

White-eyed Vireo in Illinois has surged: up 476% on the route-weighted index since 1968.

+476%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 →
66Routes 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 IllinoisNotable 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 →

White-eyed Vireo has surged in Illinois: up 476% on the route-weighted index since 1968.

White-eyed Vireo Population Forecast in Illinois

If the recent trend holds, White-eyed Vireo in Illinois is projected to rise about 18% by 2030 — from 1.8 in 2025 to a central estimate of 2.1 (95% range 1.3–3.0). A 5-year backtest shows a typical error of ±27.4%, with 40% of held-out values landing inside the 95% band.

+18%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 →
2.1Projected 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 →
1.3–3.095% 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 →
±27.4%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 Illinois is projected to rise about 18% by 2030 — from 1.8 in 2025 to a central estimate of 2.1 (95% range 1.3–3.0). A 5-year backtest shows a typical error of ±27.4%, with 40% 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 →
20262.01.22.8
20272.11.22.9
20282.11.32.9
20292.11.32.9
20302.11.33.0

White-eyed Vireo Survey Routes in Illinois

Routes recording White-eyed Vireo in Illinois.
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 →
Sandusky6720231993
Cave In Rock3320241993
Belknap2720251970
Bremen2420251969
Delwood2320251970
Beaverdam Lk2320231970
Pulaski1520251970
Karnak920252001
Royalton820252002
Belleview520251967
Dudleyville420252003
York420252000
Athensville220041974
Concord220231969
Pawnee220031967
Brnt Prairie220251993
Le Roy219981998
Eldred220251993
Darmstadt220251993
Brownville220251994
Cherry Val119911972
Athens120131995
Payson120252001
Clayton120232018
Sheffield120191986

White-eyed Vireo Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganmississippimissourinebraskanew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvirginiawest-virginiawisconsin

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