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

Red-eyed Vireo Population Trend in Wisconsin

All statesForest birds

Red-eyed Vireo in Wisconsin has surged: up 178% on the route-weighted index since 1968.

+178%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 →
98Routes 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 WisconsinNotable 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 Wisconsin: up 178% on the route-weighted index since 1968.

Red-eyed Vireo Population Forecast in Wisconsin

If the recent trend holds, Red-eyed Vireo in Wisconsin is projected to rise about 16% by 2030 — from 28 in 2025 to a central estimate of 33 (95% range 29–37). A 5-year backtest shows a typical error of ±7.3%, with 100% of held-out values landing inside the 95% band.

+16%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 →
33Projected 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 →
29–3795% 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 →
±7.3%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 Wisconsin is projected to rise about 16% by 2030 — from 28 in 2025 to a central estimate of 33 (95% range 29–37). A 5-year backtest shows a typical error of ±7.3%, with 100% 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 →
2026322835
2027322836
2028322836
2029332936
2030332937

Red-eyed Vireo Survey Routes in Wisconsin

Routes recording Red-eyed Vireo in Wisconsin.
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 →
Popple River11920251966
Land O' Lakes 210720252017
Conover10320251998
Bashaw10320251998
Eagle River9220251966
Land O Lakes9120161967
Union Twp8920251967
Washington I8620251967
Mellen7820251998
Cavour7620251998
Shanagolden7320251966
Gresham6620251998
Mcnaughton6420241966
Montreal6320251968
Wausaukee6320251980
Grand View6020251966
Amberg6020251980
Rhinelander5720231998
Minong5620251967
Weirgor Springs5620251999
Bayfield5520251967
Irma5420251967
Iron River5220251967
Rib Lake5120251966
Crandon5020251967

Red-eyed Vireo Population Trend in Other States

alabamaalaskaarkansascoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawyoming

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