Species · Maine · BBS 2025 Release · 1966–2024
Palm Warbler Population Trend in Maine
Palm Warbler in Maine has edged up: up 16% on the route-weighted index since 1977.
+16%Since 1977
31Routes In State
34Years
Notable Palm Warbler Trends in Maine
No notable trend signals for Palm Warbler in Maine. See the full index history below.
Palm Warbler Population Forecast in Maine
If the recent trend holds, Palm Warbler in Maine is projected to rise about 45% by 2027 — from 0.10 in 2022 to a central estimate of 0.14 (95% range 0.00–0.37). A 5-year backtest shows a typical error of ±339.7%, with 100% of held-out values landing inside the 95% band.
+45%Change by 2027
0.14Projected 2027 index
0.00–0.3795% range
±339.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.14 | 0.00 | 0.37 |
| 2024 | 0.14 | 0.00 | 0.37 |
| 2025 | 0.14 | 0.00 | 0.37 |
| 2026 | 0.14 | 0.00 | 0.37 |
| 2027 | 0.14 | 0.00 | 0.37 |
Palm Warbler Survey Routes in Maine
| Clayton Lake 2 | 9 | 2011 | 2011 |
| Wytopitlock | 6 | 1998 | 1996 |
| Baker Lake | 4 | 2005 | 1996 |
| Clayton Lake | 2 | 2001 | 1995 |
| Big Twenty | 2 | 2007 | 1995 |
| Northfield 2 | 1 | 2022 | 1998 |
| Biddeford | 1 | 1976 | 1976 |
| Wilson Mills | 1 | 2022 | 1993 |
| Nesowadnehun | 1 | 1993 | 1993 |
| Greenwood | 1 | 2006 | 2006 |
| Reeds | 1 | 1993 | 1993 |
| Hermon | 1 | 2011 | 2008 |
| Eastbrook | 1 | 1994 | 1971 |
| Hancock | 1 | 2010 | 2010 |
| Aurora | 1 | 2009 | 1989 |
| Northfield | 1 | 1981 | 1977 |
| Carrying Pl | 1 | 2015 | 1998 |
| Baker Lake 2 | 1 | 2011 | 2011 |
| Charleston | 1 | 2008 | 1988 |
| Seboomook Lk | 1 | 2008 | 1991 |
| Greenville | 1 | 1998 | 1997 |
| Benedicta | 1 | 2016 | 1998 |
| Medway | 1 | 2017 | 1991 |
| Grnd Lk Strm | 1 | 2000 | 1998 |
| Ludlow | 1 | 1998 | 1986 |
Palm Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.