Species · Massachusetts · BBS 2025 Release · 1966–2024
Pine Warbler Population Trend in Massachusetts
Pine Warbler in Massachusetts has surged: up 499% on the route-weighted index since 1968.
+499%Since 1968
28Routes In State
58Years
Notable Pine Warbler Trends in Massachusetts
long arc increasecomputed index
Pine Warbler has surged in Massachusetts: up 499% on the route-weighted index since 1968.
Pine Warbler Population Forecast in Massachusetts
If the recent trend holds, Pine Warbler in Massachusetts is projected to rise about 14% by 2029 — from 10 in 2024 to a central estimate of 12 (95% range 8.1–16). A 5-year backtest shows a typical error of ±11.1%, with 100% of held-out values landing inside the 95% band.
+14%Change by 2029
12Projected 2029 index
8.1–1695% range
±11.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 11 | 7.3 | 15 |
| 2026 | 11 | 7.5 | 15 |
| 2027 | 11 | 7.7 | 15 |
| 2028 | 12 | 7.9 | 15 |
| 2029 | 12 | 8.1 | 16 |
Pine Warbler Survey Routes in Massachusetts
| Wellfleet 2 | 40 | 2024 | 2016 |
| Marion | 28 | 2024 | 1970 |
| Cape Cod Ns | 24 | 2007 | 1989 |
| Ware River | 23 | 2022 | 1993 |
| Prattville | 17 | 2019 | 1966 |
| Maynard | 17 | 2022 | 1988 |
| Holden | 17 | 2024 | 1978 |
| S Barre | 13 | 2024 | 1983 |
| N Orange | 13 | 2024 | 1980 |
| Belchertown | 8 | 2024 | 1977 |
| Chesterfield | 7 | 2024 | 2002 |
| Monterey | 7 | 2024 | 2019 |
| Gay Head | 7 | 2024 | 1996 |
| N. Andover | 7 | 2024 | 1995 |
| Brockton | 6 | 2019 | 1990 |
| Wellfleet | 5 | 2007 | 1966 |
| Warren | 5 | 2009 | 1976 |
| Chilmark | 4 | 1983 | 1971 |
| Newburyport | 4 | 2022 | 1993 |
| Littleton | 4 | 2024 | 1978 |
| Mansfield | 3 | 2024 | 1990 |
| Sheffield | 3 | 2022 | 2005 |
| N Oxford | 2 | 2022 | 2004 |
| Warren 2 | 2 | 2024 | 2010 |
| E Dennis | 1 | 2021 | 1967 |
Pine Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.