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Species · Tennessee · BBS 2026 Release · 1966–2025

Yellow-billed Cuckoo Population Trend in Tennessee

All statesForest birds

Yellow-billed Cuckoo in Tennessee has declined: down 29% on the route-weighted index since 1968.

-29%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 →
55Routes 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 TennesseeNotable 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 Tennessee. See the full index history below.

Yellow-billed Cuckoo Population Forecast in Tennessee

If the recent trend holds, Yellow-billed Cuckoo in Tennessee is projected to fall about 38% by 2030 — from 6.0 in 2025 to a central estimate of 3.8 (95% range 0.56–7.0). A 5-year backtest shows a typical error of ±24.9%, with 100% of held-out values landing inside the 95% band.

-38%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 →
3.8Projected 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 →
0.56–7.095% 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 →
±24.9%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 Tennessee is projected to fall about 38% by 2030 — from 6.0 in 2025 to a central estimate of 3.8 (95% range 0.56–7.0). A 5-year backtest shows a typical error of ±24.9%, with 100% 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 →
20264.20.957.4
20274.10.857.3
20284.00.757.2
20293.90.667.1
20303.80.567.0

Yellow-billed Cuckoo Survey Routes in Tennessee

Routes recording Yellow-billed Cuckoo in Tennessee.
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 →
Humboldt2320251966
Campbellsville2120171966
Mansfield2020251966
Trace Collinwood1820182015
Whiteville1420251966
Big Sandy1420251966
Sweetlips1420231966
Trace Lewis1220172013
Wrigley1020221966
Indian Mound 2920232004
Brownsville820251966
Silerton820241966
Union Hill820241967
Collinwood720251966
Lewis Forest720251966
Pawpaw 2720252013
Tiptonville620251966
Trenton620231966
Peytonsville620241966
Pawpaw520121966
Moscow520251966
Indian Mound519981966
Belotes Bend520181966
White House520191966
Climer520041968

Yellow-billed Cuckoo Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawest-virginiawisconsinwyoming

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