Species · New Jersey · BBS 2025 Release · 1966–2024
Blue-winged Warbler Population Trend in New Jersey
Blue-winged Warbler in New Jersey has collapsed: down 90% on the route-weighted index since 1968.
-90%Since 1968
33Routes In State
57Years
Notable Blue-winged Warbler Trends in New Jersey
long arc declinecomputed index
Blue-winged Warbler has collapsed in New Jersey: down 90% on the route-weighted index since 1968.
Blue-winged Warbler Population Forecast in New Jersey
If the recent trend holds, Blue-winged Warbler in New Jersey is projected to fall about 56% by 2029 — from 0.14 in 2024 to a central estimate of 0.06 (95% range 0.00–0.79). A 5-year backtest shows a typical error of ±112%, with 100% of held-out values landing inside the 95% band.
-56%Change by 2029
0.06Projected 2029 index
0.00–0.7995% range
±112%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.13 | 0.00 | 0.86 |
| 2026 | 0.12 | 0.00 | 0.85 |
| 2027 | 0.10 | 0.00 | 0.83 |
| 2028 | 0.08 | 0.00 | 0.81 |
| 2029 | 0.06 | 0.00 | 0.79 |
Blue-winged Warbler Survey Routes in New Jersey
| Albion | 4 | 1992 | 1966 |
| Del Haven | 3 | 1991 | 1991 |
| Spraguetown 2 | 3 | 2004 | 2000 |
| Six Points | 2 | 2012 | 2012 |
| Holmansville | 2 | 1996 | 1969 |
| High Point | 2 | 2021 | 1977 |
| Gillette | 2 | 2024 | 1989 |
| Mt Misery | 2 | 1979 | 1976 |
| Winslow | 2 | 2002 | 1989 |
| Greenwich | 1 | 1973 | 1973 |
| Toms River | 1 | 1997 | 1976 |
| Ancora | 1 | 1975 | 1966 |
| Bennett Mill | 1 | 2000 | 1966 |
| Sandbrook | 1 | 2017 | 1970 |
| New Bedford | 1 | 2005 | 1971 |
| Croton | 1 | 2007 | 1970 |
| Hope | 1 | 1993 | 1976 |
| Midvale | 1 | 1999 | 1970 |
| Kemah Lake | 1 | 2019 | 1980 |
| Bloomsbury | 1 | 2024 | 1987 |
| Dover | 1 | 2023 | 1977 |
| Pottersville | 1 | 1998 | 1979 |
| Keyport | 1 | 2009 | 1990 |
| Cranbury | 1 | 2005 | 1994 |
| Roosevelt | 1 | 1997 | 1986 |
Blue-winged Warbler Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.