Species · Maine · BBS 2025 Release · 1966–2024
Chestnut-sided Warbler Population Trend in Maine
Chestnut-sided Warbler in Maine has held roughly steady: up 9% on the route-weighted index since 1968.
+9%Since 1968
77Routes In State
58Years
Notable Chestnut-sided Warbler Trends in Maine
No notable trend signals for Chestnut-sided Warbler in Maine. See the full index history below.
Chestnut-sided Warbler Population Forecast in Maine
If the recent trend holds, Chestnut-sided Warbler in Maine is projected to fall about 18% by 2029 — from 6.6 in 2024 to a central estimate of 5.4 (95% range 1.6–9.3). A 5-year backtest shows a typical error of ±18.2%, with 100% of held-out values landing inside the 95% band.
-18%Change by 2029
5.4Projected 2029 index
1.6–9.395% range
±18.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 5.7 | 1.8 | 9.5 |
| 2026 | 5.6 | 1.8 | 9.5 |
| 2027 | 5.5 | 1.7 | 9.4 |
| 2028 | 5.5 | 1.6 | 9.3 |
| 2029 | 5.4 | 1.6 | 9.3 |
Chestnut-sided Warbler Survey Routes in Maine
| East Troy | 22 | 2019 | 1972 |
| Cornville | 20 | 2024 | 2012 |
| Brooks | 17 | 2019 | 1977 |
| Castine | 17 | 2006 | 1976 |
| Hudson | 16 | 2016 | 1973 |
| Hartford | 15 | 2024 | 1975 |
| Hermon | 15 | 2019 | 1966 |
| Benton | 14 | 1980 | 1971 |
| Washburn | 14 | 2005 | 1979 |
| Bowdoin Ctr | 13 | 2021 | 1972 |
| Northfield | 12 | 1981 | 1976 |
| Moose River | 12 | 2008 | 1983 |
| Turner 2 | 12 | 2024 | 2011 |
| Searsport | 12 | 2024 | 2002 |
| Otisfield Gr | 11 | 2015 | 1971 |
| Warren | 11 | 1990 | 1973 |
| Forest Sta | 11 | 2000 | 1966 |
| Manchester | 10 | 1995 | 1971 |
| Harmony | 10 | 2024 | 1968 |
| Charleston | 10 | 2019 | 1975 |
| Ft Fairfield | 10 | 2005 | 1993 |
| Benedicta | 9 | 2022 | 1976 |
| St David | 9 | 2005 | 1982 |
| Reeds | 8 | 2024 | 1990 |
| Cooper | 8 | 2021 | 1975 |
Chestnut-sided Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.