Species · New Jersey · BBS 2025 Release · 1966–2024
Blue Grosbeak Population Trend in New Jersey
Blue Grosbeak in New Jersey has surged: up 142% on the route-weighted index since 1969.
+142%Since 1969
22Routes In State
54Years
Notable Blue Grosbeak Trends in New Jersey
long arc increasecomputed index
Blue Grosbeak has surged in New Jersey: up 142% on the route-weighted index since 1969.
Blue Grosbeak Population Forecast in New Jersey
If the recent trend holds, Blue Grosbeak in New Jersey is projected to fall about 16% by 2029 — from 0.81 in 2024 to a central estimate of 0.68 (95% range 0.22–1.1). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.
-16%Change by 2029
0.68Projected 2029 index
0.22–1.195% range
±22.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.65 | 0.19 | 1.1 |
| 2026 | 0.66 | 0.20 | 1.1 |
| 2027 | 0.67 | 0.20 | 1.1 |
| 2028 | 0.68 | 0.21 | 1.1 |
| 2029 | 0.68 | 0.22 | 1.1 |
Blue Grosbeak Survey Routes in New Jersey
| New Bedford | 8 | 2002 | 1991 |
| Woodbury Hgt | 6 | 2024 | 1968 |
| Pedricktown 2 | 5 | 2024 | 2013 |
| Pedricktown | 3 | 2012 | 1991 |
| Greenwich | 2 | 2024 | 1966 |
| Six Points | 2 | 2022 | 1979 |
| Deepwater | 2 | 1976 | 1976 |
| Del Haven | 2 | 1991 | 1991 |
| Cape May Ch | 2 | 2013 | 1993 |
| Bennett Mill 2 | 2 | 2024 | 2016 |
| Albion | 1 | 1990 | 1978 |
| Spraguetown 2 | 1 | 2002 | 2002 |
| Sandbrook | 1 | 1980 | 1980 |
| Holmansville | 1 | 1996 | 1990 |
| Clarksville | 1 | 1984 | 1984 |
| Keyport | 1 | 1995 | 1992 |
| Cranbury | 1 | 1996 | 1988 |
| Roosevelt | 1 | 2013 | 1986 |
| Friendship | 1 | 2024 | 2015 |
| Pomona | 1 | 2023 | 1979 |
| Spraguetown | 1 | 1991 | 1991 |
| Winslow | 1 | 2024 | 1990 |
Blue Grosbeak Population Trend in Other States
alabamaarizonaarkansascaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandminnesotamississippimissourimontananebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawest-virginiawyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.