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Species · Wisconsin · BBS 2026 Release · 1966–2025

Yellow-billed Cuckoo Population Trend in Wisconsin

All statesForest birds

Yellow-billed Cuckoo in Wisconsin has declined: down 36% on the route-weighted index since 1968.

-36%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 →
95Routes 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 Yellow-billed Cuckoo 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 Yellow-billed Cuckoo in Wisconsin. See the full index history below.

Yellow-billed Cuckoo Population Forecast in Wisconsin

If the recent trend holds, Yellow-billed Cuckoo in Wisconsin is projected to rise about 43% by 2030 — from 0.14 in 2025 to a central estimate of 0.20 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±51.1%, with 80% of held-out values landing inside the 95% band.

+43%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 →
0.20Projected 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 →
0.00–0.6695% 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 →
±51.1%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, Yellow-billed Cuckoo in Wisconsin is projected to rise about 43% by 2030 — from 0.14 in 2025 to a central estimate of 0.20 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±51.1%, 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 →
20260.230.000.68
20270.220.000.68
20280.210.000.67
20290.210.000.66
20300.200.000.66

Yellow-billed Cuckoo Survey Routes in Wisconsin

Routes recording Yellow-billed Cuckoo 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 →
Bayfield720231969
Pt Washingtn720211967
Unity520211971
Amnicon Falls520001998
Land O Lakes420062001
Crandon419801967
Wis Rapids420221970
Weirgor Springs420242024
Mukwonago 2420232005
Rolling Grnd320231966
Fall River320241967
Grimms320212007
Popple River219881966
Washington I220221967
Cadott220211972
Mather220211969
Stevens Pt220181967
Saxeville220211980
Oconto Falls220231968
Manitowoc219881979
Newburg Crns220251971
Pardeeville220221967
N Andover220251967
Mount Horeb219861968
Stetsonville220221993

Yellow-billed Cuckoo Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawyoming

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