Species · Maine · BBS 2025 Release · 1966–2024
Purple Finch Population Trend in Maine
Purple Finch in Maine has collapsed: down 84% on the route-weighted index since 1968.
-84%Since 1968
78Routes In State
58Years
Notable Purple Finch Trends in Maine
long arc declinecomputed index
Purple Finch has collapsed in Maine: down 84% on the route-weighted index since 1968.
Purple Finch Population Forecast in Maine
If the recent trend holds, Purple Finch in Maine is projected to fall about 100% by 2029 — from 2.0 in 2024 to a central estimate of 0.00 (95% range 0.00–4.7). A 5-year backtest shows a typical error of ±123%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–4.795% range
±123%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 4.7 |
| 2026 | 0.00 | 0.00 | 4.7 |
| 2027 | 0.00 | 0.00 | 4.7 |
| 2028 | 0.00 | 0.00 | 4.7 |
| 2029 | 0.00 | 0.00 | 4.7 |
Purple Finch Survey Routes in Maine
| Northfield | 23 | 1981 | 1976 |
| Pillsbury Pd | 23 | 1968 | 1968 |
| Baxter | 18 | 1984 | 1977 |
| Carrying Pl | 11 | 2024 | 1979 |
| Seboomook Lk | 10 | 2014 | 1972 |
| Priestly Br. | 10 | 2013 | 1994 |
| Ludlow | 8 | 1998 | 1968 |
| Big Twenty 2 | 8 | 2009 | 2009 |
| Hancock | 6 | 2024 | 1969 |
| Clayton Lake | 6 | 2001 | 1977 |
| East Troy | 5 | 2018 | 1973 |
| Charleston | 5 | 2017 | 1975 |
| Waite | 5 | 1977 | 1977 |
| Baker Lake 2 | 5 | 2013 | 2010 |
| Benton | 4 | 1980 | 1972 |
| Washburn | 4 | 2005 | 1980 |
| Topsfield | 4 | 1996 | 1978 |
| Biddeford | 3 | 2013 | 1974 |
| Newcastle | 3 | 2024 | 1971 |
| Wilson Mills | 3 | 2024 | 1983 |
| Bethel | 3 | 2019 | 1977 |
| Warren | 3 | 1990 | 1973 |
| Deblois | 3 | 2007 | 1966 |
| Moose River | 3 | 2008 | 1983 |
| Wytopitlock | 3 | 1998 | 1976 |
Purple Finch Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.