Species · Vermont · BBS 2025 Release · 1966–2024
Canada Warbler Population Trend in Vermont
Canada Warbler in Vermont has collapsed: down 80% on the route-weighted index since 1968.
-80%Since 1968
22Routes In State
56Years
Notable Canada Warbler Trends in Vermont
long arc declinecomputed index
Canada Warbler has collapsed in Vermont: down 80% on the route-weighted index since 1968.
Canada Warbler Population Forecast in Vermont
If the recent trend holds, Canada Warbler in Vermont is projected to fall about 100% by 2029 — from 0.17 in 2024 to a central estimate of 0.00 (95% range 0.00–0.81). A 5-year backtest shows a typical error of ±117.6%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–0.8195% range
±117.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.07 | 0.00 | 0.88 |
| 2026 | 0.05 | 0.00 | 0.86 |
| 2027 | 0.03 | 0.00 | 0.84 |
| 2028 | 0.01 | 0.00 | 0.83 |
| 2029 | 0.00 | 0.00 | 0.81 |
Canada Warbler Survey Routes in Vermont
| Waterville | 6 | 1980 | 1967 |
| Landgrove | 2 | 1998 | 1968 |
| S Wallingfrd | 2 | 2007 | 1994 |
| St Johnsbury | 2 | 2016 | 1970 |
| Northfld Fls | 2 | 2011 | 1980 |
| Newbury | 2 | 2003 | 1986 |
| Marlboro | 1 | 1989 | 1967 |
| North Pownal | 1 | 1993 | 1969 |
| Stratton | 1 | 2023 | 1976 |
| S Reading | 1 | 2004 | 1968 |
| Gaysville | 1 | 2010 | 1967 |
| Post Mills | 1 | 2007 | 1967 |
| Shaftsbury | 1 | 1997 | 1973 |
| W Rutland | 1 | 2024 | 1979 |
| East Haven | 1 | 2024 | 1967 |
| Middlesex | 1 | 2023 | 1968 |
| East Calais | 1 | 2024 | 1966 |
| Hardwick | 1 | 2006 | 1966 |
| Greensboro | 1 | 2013 | 1967 |
| Fletcher | 1 | 1975 | 1975 |
| Newbury 2 | 1 | 2018 | 2010 |
| Stowe | 1 | 2023 | 1988 |
Canada Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.