Species · Vermont · BBS 2025 Release · 1966–2024
Black-billed Cuckoo Population Trend in Vermont
Black-billed Cuckoo in Vermont has collapsed: down 82% on the route-weighted index since 1968.
-82%Since 1968
25Routes In State
53Years
Notable Black-billed Cuckoo Trends in Vermont
long arc declinecomputed index
Black-billed Cuckoo has collapsed in Vermont: down 82% on the route-weighted index since 1968.
Black-billed Cuckoo Population Forecast in Vermont
If the recent trend holds, Black-billed Cuckoo in Vermont is projected to fall about 74% by 2029 — from 0.17 in 2024 to a central estimate of 0.04 (95% range 0.00–0.56). A 5-year backtest shows a typical error of ±39.1%, with 100% of held-out values landing inside the 95% band.
-74%Change by 2029
0.04Projected 2029 index
0.00–0.5695% range
±39.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.08 | 0.00 | 0.59 |
| 2026 | 0.07 | 0.00 | 0.58 |
| 2027 | 0.06 | 0.00 | 0.57 |
| 2028 | 0.05 | 0.00 | 0.57 |
| 2029 | 0.04 | 0.00 | 0.56 |
Black-billed Cuckoo Survey Routes in Vermont
| S Reading | 2 | 1986 | 1968 |
| Gaysville | 2 | 2006 | 1966 |
| W Rutland | 2 | 2024 | 1966 |
| Marlboro | 1 | 2016 | 1968 |
| North Pownal | 1 | 2023 | 1967 |
| Stratton | 1 | 1978 | 1973 |
| Landgrove | 1 | 1982 | 1966 |
| Post Mills | 1 | 2012 | 1966 |
| Shaftsbury | 1 | 2005 | 1966 |
| S Wallingfrd | 1 | 2019 | 1966 |
| St Johnsbury | 1 | 2004 | 1974 |
| East Haven | 1 | 2018 | 1966 |
| Northfld Fls | 1 | 2016 | 1989 |
| Middlesex | 1 | 2014 | 1970 |
| East Calais | 1 | 2018 | 1966 |
| Hardwick | 1 | 2016 | 1966 |
| Greensboro | 1 | 2021 | 1968 |
| Fletcher | 1 | 2021 | 1973 |
| Waterville | 1 | 1969 | 1969 |
| Hinesburg | 1 | 1994 | 1973 |
| Colchester | 1 | 2004 | 1986 |
| Grand Isle | 1 | 1995 | 1971 |
| Newbury 2 | 1 | 2016 | 2016 |
| Stowe | 1 | 2024 | 2003 |
| Bristol | 1 | 2008 | 1997 |
Black-billed Cuckoo Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.