Species · Connecticut · BBS 2025 Release · 1966–2024
Canada Warbler Population Trend in Connecticut
Canada Warbler in Connecticut has collapsed: down 85% on the route-weighted index since 1968.
-85%Since 1968
14Routes In State
48Years
Notable Canada Warbler Trends in Connecticut
long arc declinecomputed index
Canada Warbler has collapsed in Connecticut: down 85% on the route-weighted index since 1968.
Canada Warbler Population Forecast in Connecticut
If the recent trend holds, Canada Warbler in Connecticut is projected to fall about 100% by 2028 — from 0.09 in 2023 to a central estimate of 0.00 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±103.1%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2028
0.00Projected 2028 index
0.00–0.5295% range
±103.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.00 | 0.00 | 0.52 |
| 2025 | 0.00 | 0.00 | 0.52 |
| 2026 | 0.00 | 0.00 | 0.52 |
| 2027 | 0.00 | 0.00 | 0.52 |
| 2028 | 0.00 | 0.00 | 0.52 |
Canada Warbler Survey Routes in Connecticut
| Warren | 4 | 2011 | 1972 |
| Buckingham | 3 | 1972 | 1972 |
| Mystic | 1 | 1983 | 1982 |
| E Hartland | 1 | 1990 | 1966 |
| Uncasville | 1 | 1977 | 1977 |
| Woodstock | 1 | 2004 | 1968 |
| Willimantic | 1 | 2000 | 1968 |
| No Woodbury | 1 | 1985 | 1967 |
| Sherman | 1 | 2008 | 1978 |
| Danbury | 1 | 1972 | 1971 |
| Long Hill | 1 | 1982 | 1974 |
| Mid Haddam | 1 | 2014 | 2014 |
| New Hartford | 1 | 1979 | 1972 |
| Granby | 1 | 2023 | 1988 |
Canada Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.