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Species · Wisconsin · BBS 2025 Release · 1966–2024

Blue-headed Vireo Population Trend in Wisconsin

All statesForest birds

Blue-headed Vireo in Wisconsin has surged: up 518% on the route-weighted index since 1968.

+518%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 →
47Routes 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 Blue-headed 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 →

Blue-headed Vireo has surged in Wisconsin: up 518% on the route-weighted index since 1968.

Blue-headed Vireo Population Forecast in Wisconsin

If the recent trend holds, Blue-headed Vireo in Wisconsin is projected to rise about 61% by 2029 — from 0.47 in 2024 to a central estimate of 0.75 (95% range 0.36–1.1). A 5-year backtest shows a typical error of ±91%, with 80% of held-out values landing inside the 95% band.

+61%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 →
0.75Projected 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 →
0.36–1.195% 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 →
±91%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, Blue-headed Vireo in Wisconsin is projected to rise about 61% by 2029 — from 0.47 in 2024 to a central estimate of 0.75 (95% range 0.36–1.1). A 5-year backtest shows a typical error of ±91%, with 80% 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 →
20250.720.331.1
20260.730.341.1
20270.730.351.1
20280.740.351.1
20290.750.361.1

Blue-headed Vireo Survey Routes in Wisconsin

Routes recording Blue-headed 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 →
Land O' Lakes 2620242017
Chaffey520241967
Iron River520241970
Grand View320241968
Minong220241967
Bayfield220231970
Montreal220241968
Loraine220181967
Gilman220162008
Phillips220131995
Rib Lake220101973
Eagle River220241966
Popple River220241970
Wausaukee220241982
Cavour220241998
Shanagolden120241975
Land O Lakes120161970
Pigeon Creek120241999
Dresser120182005
Union Twp120212003
Cumberland120181997
Weyerhauser119981998
Couderay120141994
Exeland120031995
Merrill120032002

Blue-headed Vireo Population Trend in Other States

alabamaconnecticutgeorgiakentuckymainemarylandmassachusettsmichiganminnesotanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiopennsylvaniarhode-islandsouth-carolinatennesseevermontvirginiawest-virginia

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