Species · New Hampshire · BBS 2025 Release · 1966–2024
Herring Gull Population Trend in New Hampshire
Herring Gull in New Hampshire has collapsed: down 100% on the route-weighted index since 1968.
-100%Since 1968
12Routes In State
50Years
Notable Herring Gull Trends in New Hampshire
long arc declinecomputed index
Herring Gull has collapsed in New Hampshire: down 100% on the route-weighted index since 1968.
Herring Gull Population Forecast in New Hampshire
If the recent trend holds, Herring Gull in New Hampshire is projected to stay roughly flat through 2028, near 0.00 (95% range 0.00–11). A 5-year backtest shows a typical error of ±10084.1%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.00Projected 2028 index
0.00–1195% range
±10084.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.00 | 0.00 | 11 |
| 2025 | 0.00 | 0.00 | 11 |
| 2026 | 0.00 | 0.00 | 11 |
| 2027 | 0.00 | 0.00 | 11 |
| 2028 | 0.00 | 0.00 | 11 |
Herring Gull Survey Routes in New Hampshire
| East Kingston | 5 | 2009 | 1999 |
| Epsom | 4 | 1994 | 1967 |
| Strafford | 4 | 2007 | 1967 |
| Jefferson Hl | 3 | 1990 | 1967 |
| Peterborough | 1 | 1997 | 1997 |
| Brentwood | 1 | 1998 | 1966 |
| Dover | 1 | 2023 | 1966 |
| Concord | 1 | 1998 | 1978 |
| Mt Chocorua | 1 | 1982 | 1982 |
| Walpole | 1 | 1973 | 1973 |
| Milan | 1 | 2007 | 1969 |
| Clarksville | 1 | 2012 | 1990 |
Herring Gull Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.