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Species · Maryland · BBS 2026 Release · 1966–2025

Yellow-billed Cuckoo Population Trend in Maryland

All statesForest birds

Yellow-billed Cuckoo in Maryland has declined: down 33% on the route-weighted index since 1968.

-33%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 →
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 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 25% by 2030 — from 1.9 in 2025 to a central estimate of 2.4 (95% range 0.00–5.6). A 5-year backtest shows a typical error of ±26%, with 80% of held-out values landing inside the 95% band.

+25%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 →
2.4Projected 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 →
0.00–5.695% 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 →
±26%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 25% by 2030 — from 1.9 in 2025 to a central estimate of 2.4 (95% range 0.00–5.6). A 5-year backtest shows a typical error of ±26%, 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 →
20262.60.005.7
20272.50.005.7
20282.50.005.6
20292.40.005.6
20302.40.005.6

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 →
Furnace Town1020252015
Snow Hill919761966
Mt Nebo819891969
Potomac Park720241970
Olney720251966
Walnut720242000
Madonna720222009
Sinepuxent619781966
Earlton620242014
Island Creek620251991
Oldtown520241970
Pt Republic519881966
Tall Timbers520131966
La Plata520091966
Mardela520191966
Newark520251967
St. George'S Island520172015
Indiantown520141977
Floyd420221967
Cokesbury420251966
Ijamsville420231986
Pr Frederick420251991
Williamsport320251966
Silver Spg319891966
Pomonkey320251966

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 2026-08-14.