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

Yellow-billed Cuckoo Population Trend in Maryland

All statesGeneralists

Yellow-billed Cuckoo in Maryland has edged down: down 14% on the route-weighted index since 1968.

-14%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 →
76Routes 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 MarylandNotable 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 Maryland. See the full index history below.

Yellow-billed Cuckoo Population Forecast in Maryland

If the recent trend holds, Yellow-billed Cuckoo in Maryland is projected to rise about 15% by 2029 — from 2.2 in 2024 to a central estimate of 2.5 (95% range 0.00–5.7). A 5-year backtest shows a typical error of ±27.3%, with 80% of held-out values landing inside the 95% band.

+15%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 →
2.5Projected 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 →
0.00–5.795% 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 →
±27.3%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 Maryland is projected to rise about 15% by 2029 — from 2.2 in 2024 to a central estimate of 2.5 (95% range 0.00–5.7). A 5-year backtest shows a typical error of ±27.3%, with 80% 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 →
20252.70.005.8
20262.60.005.8
20272.60.005.8
20282.50.005.7
20292.50.005.7

Yellow-billed Cuckoo Survey Routes in Maryland

Routes recording Yellow-billed Cuckoo in Maryland.
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 →
Snow Hill919761966
Mt Nebo819891969
Potomac Park720241970
Piney Grove720241995
Walnut720242000
Madonna720222009
Melitota620241966
Cokesbury620241966
Sinepuxent619781966
Earlton620242014
Oldtown520241970
Pt Republic519881966
Tall Timbers520131966
La Plata520091966
Golden Hill520241966
Mardela520191966
St. George'S Island520172015
Indiantown520141977
Floyd420221967
Emmitsburg420221967
Elkton420241966
Millington420241966
Honga420241966
Newark420241967
Green Ridge420241995

Yellow-billed Cuckoo Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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