Species · Massachusetts · BBS 2025 Release · 1966–2024
Canada Warbler Population Trend in Massachusetts
Canada Warbler in Massachusetts has fallen sharply: down 72% on the route-weighted index since 1969.
-72%Since 1969
16Routes In State
56Years
Notable Canada Warbler Trends in Massachusetts
long arc declinecomputed index
Canada Warbler has fallen sharply in Massachusetts: down 72% on the route-weighted index since 1969.
Canada Warbler Population Forecast in Massachusetts
If the recent trend holds, Canada Warbler in Massachusetts is projected to fall about 99% by 2029 — from 0.27 in 2024 to a central estimate of 0.00 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±92.8%, with 100% of held-out values landing inside the 95% band.
-99%Change by 2029
0.00Projected 2029 index
0.00–0.3995% range
±92.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.05 | 0.00 | 0.43 |
| 2026 | 0.04 | 0.00 | 0.42 |
| 2027 | 0.02 | 0.00 | 0.41 |
| 2028 | 0.01 | 0.00 | 0.40 |
| 2029 | 0.00 | 0.00 | 0.39 |
Canada Warbler Survey Routes in Massachusetts
| Princeton | 2 | 1976 | 1969 |
| Monterey | 2 | 2024 | 2019 |
| Marion | 1 | 1992 | 1967 |
| Ware River | 1 | 2022 | 1996 |
| Newburyport | 1 | 1968 | 1967 |
| Belchertown | 1 | 2024 | 1967 |
| Warren | 1 | 1998 | 1971 |
| S Barre | 1 | 2005 | 1968 |
| N Orange | 1 | 2019 | 1968 |
| Cummington | 1 | 2014 | 1968 |
| Chesterfield | 1 | 2024 | 1967 |
| Holden | 1 | 1983 | 1980 |
| Pittsfield | 1 | 2016 | 1968 |
| Sheffield | 1 | 1999 | 1969 |
| Cummington 2 | 1 | 2019 | 2015 |
| Hancock | 1 | 2011 | 1997 |
Canada Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.