Species · New Hampshire · BBS 2025 Release · 1966–2024
Blue-winged Warbler Population Trend in New Hampshire
Blue-winged Warbler in New Hampshire has declined: down 29% on the route-weighted index since 1971.
-29%Since 1971
10Routes In State
35Years
Notable Blue-winged Warbler Trends in New Hampshire
No notable trend signals for Blue-winged Warbler in New Hampshire. See the full index history below.
Blue-winged Warbler Population Forecast in New Hampshire
If the recent trend holds, Blue-winged Warbler in New Hampshire is projected to stay roughly flat through 2029, near 0.10 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±235.6%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.10Projected 2029 index
0.00–0.2595% range
±235.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.10 | 0.00 | 0.25 |
| 2026 | 0.10 | 0.00 | 0.25 |
| 2027 | 0.10 | 0.00 | 0.25 |
| 2028 | 0.10 | 0.00 | 0.25 |
| 2029 | 0.10 | 0.00 | 0.25 |
Blue-winged Warbler Survey Routes in New Hampshire
| Hopkinton | 2 | 1996 | 1996 |
| Brentwood | 1 | 1998 | 1971 |
| Fitzwilliam | 1 | 1982 | 1982 |
| Dover | 1 | 2024 | 1967 |
| Epsom | 1 | 1999 | 1986 |
| Concord | 1 | 1998 | 1998 |
| Strafford | 1 | 2000 | 1988 |
| East Kingston | 1 | 2017 | 1999 |
| Mt Chocorua | 1 | 1975 | 1975 |
| Franconia | 1 | 1968 | 1968 |
Blue-winged Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.