BirdAnalyst
Species · Wisconsin · BBS 2025 Release · 1966–2024

Yellow-billed Cuckoo Population Trend in Wisconsin

All statesGeneralists

Yellow-billed Cuckoo in Wisconsin has edged down: down 11% on the route-weighted index since 1968.

-11%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 →
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 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 fall about 17% by 2029 — from 0.26 in 2024 to a central estimate of 0.21 (95% range 0.00–0.68). A 5-year backtest shows a typical error of ±55.6%, with 80% of held-out values landing inside the 95% band.

-17%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 →
0.21Projected 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 →
0.00–0.6895% 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 →
±55.6%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 fall about 17% by 2029 — from 0.26 in 2024 to a central estimate of 0.21 (95% range 0.00–0.68). A 5-year backtest shows a typical error of ±55.6%, 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 →
20250.240.000.70
20260.230.000.69
20270.230.000.69
20280.220.000.68
20290.210.000.68

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
N Freedom420231966
Weirgor Springs420242024
Mukwonago 2420232005
Gilman320241981
Amberg320241981
Wausaukee320231994
Newburg Crns320231971
Rolling Grnd320231966
Fall River320241967
Grimms320212007
Popple River219881966
Washington I220221967
Cadott220211972
Mather220211969
Stevens Pt220181967
Saxeville220211980
Oconto Falls220231968
Manitowoc219881979

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 2026-05-22.