Species · New Hampshire · BBS 2025 Release · 1966–2024
Blackpoll Warbler Population Trend in New Hampshire
Blackpoll Warbler in New Hampshire has fallen sharply: down 70% on the route-weighted index since 1970.
-70%Since 1970
11Routes In State
33Years
Notable Blackpoll Warbler Trends in New Hampshire
long arc declinecomputed index
Blackpoll Warbler has fallen sharply in New Hampshire: down 70% on the route-weighted index since 1970.
Blackpoll Warbler Population Forecast in New Hampshire
If the recent trend holds, Blackpoll Warbler in New Hampshire is projected to stay roughly flat through 2016, near 0.04 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±33.7%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2016
0.04Projected 2016 index
0.00–0.1995% range
±33.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2012 | 0.05 | 0.00 | 0.20 |
| 2013 | 0.05 | 0.00 | 0.20 |
| 2014 | 0.05 | 0.00 | 0.20 |
| 2015 | 0.04 | 0.00 | 0.20 |
| 2016 | 0.04 | 0.00 | 0.19 |
Blackpoll Warbler Survey Routes in New Hampshire
| Crawford Not | 5 | 1973 | 1968 |
| Clarksville | 2 | 2009 | 1968 |
| Fitzwilliam | 1 | 1982 | 1970 |
| Hopkinton | 1 | 1969 | 1969 |
| Mt Chocorua | 1 | 1993 | 1976 |
| Jefferson Hl | 1 | 1971 | 1968 |
| Franconia | 1 | 1989 | 1972 |
| Milan | 1 | 1975 | 1975 |
| Jeffers Ntch | 1 | 2011 | 1994 |
| Dixvil Notch | 1 | 2000 | 1975 |
| Glen | 1 | 1983 | 1983 |
Blackpoll Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.