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Species · Tennessee · BBS 2025 Release · 1966–2024

Yellow-billed Cuckoo Population Trend in Tennessee

All statesGeneralists

Yellow-billed Cuckoo in Tennessee 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 →
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 →
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 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 44% by 2029 — from 6.6 in 2024 to a central estimate of 3.7 (95% range 0.52–6.9). A 5-year backtest shows a typical error of ±20.3%, with 100% of held-out values landing inside the 95% band.

-44%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 →
3.7Projected 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 →
0.52–6.995% 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 →
±20.3%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 44% by 2029 — from 6.6 in 2024 to a central estimate of 3.7 (95% range 0.52–6.9). A 5-year backtest shows a typical error of ±20.3%, 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 →
20254.10.937.3
20264.00.827.2
20273.90.727.1
20283.80.627.0
20293.70.526.9

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 →
Big Sandy3820241966
Mansfield2220241966
Campbellsville2120171966
Trace Collinwood1820182015
Sweetlips1420231966
Trace Lewis1220172013
Collinwood1120241966
Wrigley1020221966
Indian Mound 2920232004
Brownsville820241966
Silerton820241966
Union Hill820241967
Jasper820241968
Lewis Forest720241966
Trenton620231966
Peytonsville620241966
Pawpaw520121966
Tibbs520241966
Humboldt520241966
Indian Mound519981966
Belotes Bend520181966
White House520191966
Climer520041968
Corryton Rd520011966
Pawpaw 2520232013

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 2026-05-22.