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Species · Wisconsin · BBS 2026 Release · 1966–2025

Baltimore Oriole Population Trend in Wisconsin

All statesForest birds

Baltimore Oriole in Wisconsin has edged down: down 21% on the route-weighted index since 1968.

-21%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 →
97Routes 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 Baltimore Oriole 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 →

No notable trend signals for Baltimore Oriole in Wisconsin. See the full index history below.

Baltimore Oriole Population Forecast in Wisconsin

If the recent trend holds, Baltimore Oriole in Wisconsin is projected to fall about 20% by 2030 — from 4.6 in 2025 to a central estimate of 3.7 (95% range 2.1–5.2). A 5-year backtest shows a typical error of ±22%, with 80% of held-out values landing inside the 95% band.

-20%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 →
3.7Projected 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 →
2.1–5.295% 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 →
±22%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, Baltimore Oriole in Wisconsin is projected to fall about 20% by 2030 — from 4.6 in 2025 to a central estimate of 3.7 (95% range 2.1–5.2). A 5-year backtest shows a typical error of ±22%, with 80% 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 →
20263.92.35.5
20273.82.35.4
20283.82.25.3
20293.72.25.3
20303.72.15.2

Baltimore Oriole Survey Routes in Wisconsin

Routes recording Baltimore Oriole 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 →
Esdaile2320251966
Grimms2120211998
Hazel Green1720251966
Omro1620011966
River Falls1620251998
Paris1520251966
N Andover1420251967
Prairie Du Chien1320251998
Fall River1220251966
Gresham1220251998
Weyerhauser1020251966
Gilman1020251966
Viroqua1020241966
Wiota1020251966
Beloit1020251998
Brownsville920251974
Cumberland820251966
Pardeeville820251967
Dresser720251966
Gilmanton720251966
Trempealeau720251966
Eden720251966
Raymond720251966
Hudson620251966
Loraine620251966

Baltimore Oriole Population Trend in Other States

alabamaarkansascaliforniacoloradoconnecticutdelawaregeorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawyoming

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