BirdAnalyst
Species · New Jersey · BBS 2026 Release · 1966–2025

Yellow-billed Cuckoo Population Trend in New Jersey

All statesForest birds

Yellow-billed Cuckoo in New Jersey has edged up: up 16% on the route-weighted index since 1968.

+16%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 →
43Routes 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 New JerseyNotable 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 New Jersey. See the full index history below.

Yellow-billed Cuckoo Population Forecast in New Jersey

If the recent trend holds, Yellow-billed Cuckoo in New Jersey is projected to fall about 37% by 2030 — from 1.8 in 2025 to a central estimate of 1.1 (95% range 0.00–3.3). A 5-year backtest shows a typical error of ±22.6%, with 100% of held-out values landing inside the 95% band.

-37%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 →
1.1Projected 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 →
0.00–3.395% 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 →
±22.6%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 New Jersey is projected to fall about 37% by 2030 — from 1.8 in 2025 to a central estimate of 1.1 (95% range 0.00–3.3). A 5-year backtest shows a typical error of ±22.6%, 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 →
20261.20.003.3
20271.20.003.3
20281.10.003.3
20291.10.003.3
20301.10.003.3

Yellow-billed Cuckoo Survey Routes in New Jersey

Routes recording Yellow-billed Cuckoo in New Jersey.
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 →
High Point1620251977
Spraguetown 21120072000
Del Haven719911991
Friendship520251978
Villas519811979
Spraguetown 3520252023
Clarksville319841973
Midvale320211971
Six Points220251978
Holmansville220091970
Hope219941973
Roosevelt220191986
Pomona220251978
Spraguetown219971978
Cape May Ch220131992
Winslow220241989
Ramseysburg220231995
Woodbury Hgt120251967
Greenwich120151966
Deepwater119691969
Toms River120081966
Albion120221967
Ancora119771968
Masonville119671967
Bennett Mill119981967

Yellow-billed Cuckoo Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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