Species · Connecticut · BBS 2025 Release · 1966–2024
Purple Finch Population Trend in Connecticut
Purple Finch in Connecticut has collapsed: down 91% on the route-weighted index since 1968.
-91%Since 1968
19Routes In State
53Years
Notable Purple Finch Trends in Connecticut
long arc declinecomputed index
Purple Finch has collapsed in Connecticut: down 91% on the route-weighted index since 1968.
Purple Finch Population Forecast in Connecticut
If the recent trend holds, Purple Finch in Connecticut is projected to fall about 63% by 2027 — from 0.18 in 2022 to a central estimate of 0.07 (95% range 0.00–0.94). A 5-year backtest shows a typical error of ±219.5%, with 100% of held-out values landing inside the 95% band.
-63%Change by 2027
0.07Projected 2027 index
0.00–0.9495% range
±219.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.16 | 0.00 | 1.0 |
| 2024 | 0.14 | 0.00 | 1.0 |
| 2025 | 0.12 | 0.00 | 0.99 |
| 2026 | 0.09 | 0.00 | 0.97 |
| 2027 | 0.07 | 0.00 | 0.94 |
Purple Finch Survey Routes in Connecticut
| Woodstock | 4 | 1987 | 1968 |
| Warren | 4 | 2011 | 1972 |
| New Hartford | 3 | 2008 | 2000 |
| Westbrook | 2 | 1992 | 1970 |
| Sherman | 2 | 2008 | 1972 |
| Mid Haddam | 2 | 1995 | 1979 |
| Southington | 2 | 1984 | 1975 |
| New Hartford | 2 | 1986 | 1976 |
| Mystic | 1 | 2002 | 1974 |
| E Hartland | 1 | 1991 | 1966 |
| Buckingham | 1 | 1979 | 1966 |
| Uncasville | 1 | 2008 | 1981 |
| Willimantic | 1 | 2005 | 1967 |
| No Woodbury | 1 | 2022 | 1967 |
| Greenwich | 1 | 1976 | 1975 |
| Danbury | 1 | 1975 | 1971 |
| Long Hill | 1 | 1983 | 1974 |
| Warren 2 | 1 | 2015 | 2013 |
| Granby | 1 | 2022 | 1989 |
Purple Finch Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.