Species · New Hampshire · BBS 2025 Release · 1966–2024
Chestnut-sided Warbler Population Trend in New Hampshire
Chestnut-sided Warbler in New Hampshire has held roughly steady: up 4% on the route-weighted index since 1968.
+4%Since 1968
26Routes In State
58Years
Notable Chestnut-sided Warbler Trends in New Hampshire
No notable trend signals for Chestnut-sided Warbler in New Hampshire. See the full index history below.
Chestnut-sided Warbler Population Forecast in New Hampshire
If the recent trend holds, Chestnut-sided Warbler in New Hampshire is projected to fall about 34% by 2029 — from 11 in 2024 to a central estimate of 7.2 (95% range 2.7–12). A 5-year backtest shows a typical error of ±31.4%, with 80% of held-out values landing inside the 95% band.
-34%Change by 2029
7.2Projected 2029 index
2.7–1295% range
±31.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 7.6 | 3.1 | 12 |
| 2026 | 7.5 | 3.0 | 12 |
| 2027 | 7.4 | 2.9 | 12 |
| 2028 | 7.3 | 2.8 | 12 |
| 2029 | 7.2 | 2.7 | 12 |
Chestnut-sided Warbler Survey Routes in New Hampshire
| Lempster | 25 | 2024 | 1966 |
| Glen | 24 | 2024 | 1975 |
| Jefferson Hl | 21 | 2024 | 1966 |
| Stratford | 21 | 2024 | 1966 |
| Canterbury | 16 | 2024 | 1966 |
| Gilmantn I W | 14 | 2024 | 1969 |
| Walpole | 14 | 2024 | 1966 |
| Wilmot | 12 | 2024 | 1966 |
| Milan | 12 | 2024 | 1966 |
| Dixville Notch 2 | 12 | 2024 | 2018 |
| Clarksville | 11 | 2024 | 1969 |
| Fitzwilliam | 10 | 2024 | 1966 |
| Marlow | 10 | 2024 | 1966 |
| Dixvil Notch | 10 | 2017 | 1966 |
| Crawford Not | 9 | 1975 | 1966 |
| Hopkinton | 8 | 2024 | 1966 |
| Concord | 7 | 2024 | 1966 |
| Strafford | 5 | 2024 | 1966 |
| Mt Chocorua | 5 | 2024 | 1966 |
| East Kingston | 4 | 2024 | 1999 |
| Jeffers Ntch | 4 | 2024 | 1993 |
| Franconia | 3 | 2024 | 1966 |
| Brentwood | 2 | 1998 | 1966 |
| Dover | 2 | 2024 | 1966 |
| Epsom | 2 | 2022 | 1966 |
Chestnut-sided Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.