BirdAnalyst
Species · BCR 28 · BBS 2026 Release · 1966–2025

Yellow-billed Cuckoo In Appalachian Mountains

All regionsAppalachian MountainsForest birds

Yellow-billed Cuckoo in Appalachian Mountains has declined: down 34% on the route-weighted index since 1968.

-34%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 →
393Routes In RegionSurvey 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 SignalsNotable 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 Appalachian Mountains. See the full index history below.

Yellow-billed Cuckoo In Appalachian Mountains Population Forecast

If the recent trend holds, Yellow-billed Cuckoo in Appalachian Mountains is projected to rise about 84% by 2030 — from 1.1 in 2025 to a central estimate of 2.0 (95% range 0.96–3.1). A 5-year backtest shows a typical error of ±37.1%, with 80% of held-out values landing inside the 95% band.

+84%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 →
2.0Projected 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 →
0.96–3.195% 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 →
±37.1%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 Appalachian Mountains is projected to rise about 84% by 2030 — from 1.1 in 2025 to a central estimate of 2.0 (95% range 0.96–3.1). A 5-year backtest shows a typical error of ±37.1%, 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 →
20262.11.03.2
20272.10.993.2
20282.10.983.2
20292.10.973.1
20302.00.963.1

Routes In Appalachian Mountains

Routes recording Yellow-billed Cuckoo in Appalachian Mountains.
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 →
Big MeadowsVIRGINIA192023
Sunny EveALABAMA182025
Sproul Sf-BPENNSYLVANIA182023
RosecransPENNSYLVANIA172023
DearmanvilleALABAMA161983
High PointNEW-JERSEY162025
Beattyville 2KENTUCKY142024
Mawr GlenPENNSYLVANIA122024
StevensonALABAMA112024
WelchWEST-VIRGINIA112021
Mt OliveALABAMA102025
OneontaALABAMA102025
RiversideALABAMA102013
Cumberlnd GpKENTUCKY102018
WilgusOHIO102019
Big FlatPENNSYLVANIA101981
JeannettePENNSYLVANIA102022
SummittALABAMA91981
Borden SprngALABAMA91998
TalladegaALABAMA92025
Orange LakeNEW-YORK91988
GreensportALABAMA82025
MaytownALABAMA82025
ShannonGEORGIA82019
Mt NeboMARYLAND81989

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