Species · Maine · BBS 2025 Release · 1966–2024
Cape May Warbler Population Trend in Maine
Cape May Warbler in Maine has fallen sharply: down 74% on the route-weighted index since 1974.
-74%Since 1974
57Routes In State
49Years
Notable Cape May Warbler Trends in Maine
long arc declinecomputed index
Cape May Warbler has fallen sharply in Maine: down 74% on the route-weighted index since 1974.
Cape May Warbler Population Forecast in Maine
If the recent trend holds, Cape May Warbler in Maine is projected to fall about 100% by 2027 — from 0.29 in 2022 to a central estimate of 0.00 (95% range 0.00–0.61). A 5-year backtest shows a typical error of ±79.8%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2027
0.00Projected 2027 index
0.00–0.6195% range
±79.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.04 | 0.00 | 0.66 |
| 2024 | 0.03 | 0.00 | 0.65 |
| 2025 | 0.02 | 0.00 | 0.63 |
| 2026 | 0.00 | 0.00 | 0.62 |
| 2027 | 0.00 | 0.00 | 0.61 |
Cape May Warbler Survey Routes in Maine
| Pillsbury Pd | 8 | 1968 | 1968 |
| Baxter | 6 | 1984 | 1977 |
| Northfield | 4 | 1981 | 1976 |
| Clayton Lake | 4 | 2008 | 1977 |
| Otisfield Gr | 3 | 1975 | 1975 |
| Seboomook Lk | 3 | 2006 | 1974 |
| Greenville | 3 | 2022 | 1976 |
| Benedicta | 3 | 2022 | 1980 |
| Grnd Lk Strm | 3 | 1993 | 1990 |
| Baker Lake | 3 | 2009 | 1994 |
| Heron Lake | 3 | 2003 | 1984 |
| Freedom | 2 | 2006 | 2006 |
| Eastbrook | 2 | 1981 | 1973 |
| Aurora | 2 | 1994 | 1976 |
| Carrying Pl | 2 | 2005 | 1980 |
| Winn | 2 | 1998 | 1978 |
| Ludlow | 2 | 1998 | 1968 |
| Horse Mtn | 2 | 1994 | 1984 |
| Cornville | 2 | 2019 | 2019 |
| Telos | 2 | 1995 | 1995 |
| Clayton Lake 2 | 2 | 2013 | 2010 |
| Rome | 2 | 2001 | 1999 |
| Northfield 2 | 1 | 1996 | 1992 |
| Newcastle | 1 | 1993 | 1993 |
| Wilson Mills | 1 | 1987 | 1984 |
Cape May Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.