Species · New Jersey · BBS 2025 Release · 1966–2024
Grasshopper Sparrow Population Trend in New Jersey
Grasshopper Sparrow in New Jersey has fallen sharply: down 62% on the route-weighted index since 1969.
-62%Since 1969
29Routes In State
53Years
Notable Grasshopper Sparrow Trends in New Jersey
long arc declinecomputed index
Grasshopper Sparrow has fallen sharply in New Jersey: down 62% on the route-weighted index since 1969.
Grasshopper Sparrow Population Forecast in New Jersey
If the recent trend holds, Grasshopper Sparrow in New Jersey is projected to fall about 17% by 2029 — from 0.19 in 2024 to a central estimate of 0.16 (95% range 0.00–0.45). A 5-year backtest shows a typical error of ±52.5%, with 100% of held-out values landing inside the 95% band.
-17%Change by 2029
0.16Projected 2029 index
0.00–0.4595% range
±52.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.17 | 0.00 | 0.46 |
| 2026 | 0.16 | 0.00 | 0.46 |
| 2027 | 0.16 | 0.00 | 0.46 |
| 2028 | 0.16 | 0.00 | 0.45 |
| 2029 | 0.16 | 0.00 | 0.45 |
Grasshopper Sparrow Survey Routes in New Jersey
| Croton | 5 | 2007 | 1970 |
| Woodbury Hgt | 3 | 2024 | 1967 |
| Bloomsbury | 3 | 1991 | 1969 |
| Roosevelt | 3 | 2007 | 1986 |
| Deepwater | 2 | 1977 | 1971 |
| Hope | 2 | 1977 | 1977 |
| Pottersville | 2 | 2022 | 1977 |
| Greenwich | 1 | 2022 | 1978 |
| Six Points | 1 | 2019 | 1978 |
| Toms River | 1 | 2005 | 1996 |
| Albion | 1 | 1977 | 1968 |
| Bennett Mill | 1 | 1976 | 1976 |
| Sandbrook | 1 | 2023 | 1969 |
| Holmansville | 1 | 1996 | 1981 |
| Clarksville | 1 | 1976 | 1973 |
| New Bedford | 1 | 1973 | 1970 |
| Midvale | 1 | 1975 | 1975 |
| Kemah Lake | 1 | 2005 | 1969 |
| High Point | 1 | 1988 | 1988 |
| Keyport | 1 | 1995 | 1990 |
| Cranbury | 1 | 1997 | 1997 |
| Friendship | 1 | 2018 | 2016 |
| Pomona | 1 | 1990 | 1990 |
| Mt Misery | 1 | 1989 | 1977 |
| Pedricktown 2 | 1 | 2017 | 2017 |
Grasshopper Sparrow Population Trend in Other States
alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.