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

Black-billed Cuckoo Population Trend in Ohio

All statesGeneralists

Black-billed Cuckoo in Ohio has fallen sharply: down 65% on the route-weighted index since 1968.

-65%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 →
71Routes 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 Black-billed Cuckoo Trends in OhioNotable 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 declinecomputed 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 →

Black-billed Cuckoo has fallen sharply in Ohio: down 65% on the route-weighted index since 1968.

Black-billed Cuckoo Population Forecast in Ohio

If the recent trend holds, Black-billed Cuckoo in Ohio is projected to stay roughly flat through 2029, near 0.13 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±260.8%, with 100% of held-out values landing inside the 95% band.

-5%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 →
0.13Projected 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 →
0.00–0.6695% 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 →
±260.8%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, Black-billed Cuckoo in Ohio is projected to stay roughly flat through 2029, near 0.13 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±260.8%, with 100% 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 →
20250.150.000.69
20260.150.000.68
20270.140.000.67
20280.130.000.67
20290.130.000.66

Black-billed Cuckoo Survey Routes in Ohio

Routes recording Black-billed Cuckoo in Ohio.
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 →
Adamsville719821971
Shawnee S.F. 2620152002
Greasy Ridge419911970
Coal Run319911966
Tar Hollow220191994
Tick Ridge220192000
Middlefield219951969
Baxter Ridge220182018
Wilgus220031995
Rome219971967
Hiram220001993
Keene219951995
Lockport119751969
Napoleon119911972
Bloomville120141996
Wayne N.F.120192015
Shawnee S.F.119991993
Zaleski S.F.120241992
Scioto Trail120071992
Pittsfield120161999
Ashley120071989
Mohican S.F.120171995
Wayland120081992
Garrettsvile119891967
Strongsville119821967

Black-billed Cuckoo Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaoklahomapennsylvaniarhode-islandsouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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