Species · New Hampshire · BBS 2025 Release · 1966–2024
Mourning Warbler Population Trend in New Hampshire
Mourning Warbler in New Hampshire has risen sharply: up 69% on the route-weighted index since 1969.
+69%Since 1969
12Routes In State
54Years
Notable Mourning Warbler Trends in New Hampshire
long arc increasecomputed index
Mourning Warbler has risen sharply in New Hampshire: up 69% on the route-weighted index since 1969.
Mourning Warbler Population Forecast in New Hampshire
If the recent trend holds, Mourning Warbler in New Hampshire is projected to fall about 21% by 2029 — from 0.27 in 2024 to a central estimate of 0.22 (95% range 0.00–0.48). A 5-year backtest shows a typical error of ±89.2%, with 100% of held-out values landing inside the 95% band.
-21%Change by 2029
0.22Projected 2029 index
0.00–0.4895% range
±89.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.21 | 0.00 | 0.47 |
| 2026 | 0.21 | 0.00 | 0.48 |
| 2027 | 0.21 | 0.00 | 0.48 |
| 2028 | 0.22 | 0.00 | 0.48 |
| 2029 | 0.22 | 0.00 | 0.48 |
Mourning Warbler Survey Routes in New Hampshire
| Dixville Notch 2 | 6 | 2024 | 2018 |
| Marlow | 2 | 2018 | 2018 |
| Dixvil Notch | 2 | 2017 | 1971 |
| Hopkinton | 1 | 2017 | 2010 |
| Wilmot | 1 | 2016 | 2010 |
| Jefferson Hl | 1 | 2023 | 1966 |
| Franconia | 1 | 2012 | 1966 |
| Milan | 1 | 2023 | 1966 |
| Stratford | 1 | 2023 | 1966 |
| Clarksville | 1 | 2023 | 1969 |
| Glen | 1 | 2022 | 1996 |
| Jeffers Ntch | 1 | 2010 | 1996 |
Mourning Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.