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

Yellow-billed Cuckoo Population Trend in Vermont

All statesGeneralists

Yellow-billed Cuckoo in Vermont has declined: down 27% on the route-weighted index since 1980.

-27%Since 1980TrendPercent 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 →
11Routes 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 →
28YearsYears 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 VermontNotable 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 Vermont. See the full index history below.

Yellow-billed Cuckoo Population Forecast in Vermont

If the recent trend holds, Yellow-billed Cuckoo in Vermont is projected to rise about 14% by 2028 — from 0.06 in 2023 to a central estimate of 0.06 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±56.3%, with 100% of held-out values landing inside the 95% band.

+14%Change by 2028TrendPercent 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 →
0.06Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2595% 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 →
±56.3%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 Vermont is projected to rise about 14% by 2028 — from 0.06 in 2023 to a central estimate of 0.06 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±56.3%, with 100% of held-out values landing inside the 95% band.19742028
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 →
20240.070.000.26
20250.070.000.26
20260.070.000.26
20270.070.000.25
20280.060.000.25

Yellow-billed Cuckoo Survey Routes in Vermont

Routes recording Yellow-billed Cuckoo in Vermont.
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 →
S Reading420061974
North Pownal219811981
Gaysville120052005
Post Mills119881988
S Wallingfrd120111981
W Rutland120231988
East Haven120142014
Fletcher119971992
Waterville119801980
Hinesburg119881974
Grand Isle119951995

Yellow-billed Cuckoo Population Trend in Other States

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

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