Species · New Hampshire · BBS 2025 Release · 1966–2024
Canada Warbler Population Trend in New Hampshire
Canada Warbler in New Hampshire has collapsed: down 86% on the route-weighted index since 1968.
-86%Since 1968
26Routes In State
58Years
Notable Canada Warbler Trends in New Hampshire
long arc declinecomputed index
Canada Warbler has collapsed in New Hampshire: down 86% on the route-weighted index since 1968.
Canada Warbler Population Forecast in New Hampshire
If the recent trend holds, Canada Warbler in New Hampshire is projected to fall about 100% by 2029 — from 0.46 in 2024 to a central estimate of 0.00 (95% range 0.00–0.91). A 5-year backtest shows a typical error of ±165.2%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–0.9195% range
±165.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 0.91 |
| 2026 | 0.00 | 0.00 | 0.91 |
| 2027 | 0.00 | 0.00 | 0.91 |
| 2028 | 0.00 | 0.00 | 0.91 |
| 2029 | 0.00 | 0.00 | 0.91 |
Canada Warbler Survey Routes in New Hampshire
| Franconia | 5 | 2024 | 1966 |
| Dixville Notch 2 | 4 | 2024 | 2018 |
| Dixvil Notch | 3 | 2017 | 1966 |
| Epsom | 2 | 2008 | 1966 |
| Milan | 2 | 2015 | 1966 |
| Clarksville | 2 | 2023 | 1966 |
| Glen | 2 | 1997 | 1975 |
| Peterborough | 1 | 1985 | 1969 |
| Brentwood | 1 | 1990 | 1966 |
| Fitzwilliam | 1 | 2000 | 1966 |
| Dover | 1 | 1980 | 1969 |
| Hopkinton | 1 | 2021 | 1966 |
| Concord | 1 | 2016 | 1966 |
| Strafford | 1 | 2021 | 1967 |
| Canterbury | 1 | 2024 | 1966 |
| Gilmantn I W | 1 | 2017 | 1970 |
| Wilmot | 1 | 2019 | 1966 |
| Mt Chocorua | 1 | 1998 | 1967 |
| Walpole | 1 | 2016 | 1966 |
| Marlow | 1 | 2019 | 1966 |
| Lempster | 1 | 2008 | 1972 |
| Crawford Not | 1 | 1972 | 1967 |
| Jefferson Hl | 1 | 2016 | 1966 |
| Stratford | 1 | 2023 | 1966 |
| East Kingston | 1 | 2018 | 2000 |
Canada Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.