Species · Delaware · BBS 2025 Release · 1966–2024
Northern Bobwhite Population Trend in Delaware
Northern Bobwhite in Delaware has collapsed: down 95% on the route-weighted index since 1968.
-95%Since 1968
14Routes In State
57Years
Notable Northern Bobwhite Trends in Delaware
long arc declinecomputed index
Northern Bobwhite has collapsed in Delaware: down 95% on the route-weighted index since 1968.
Northern Bobwhite Population Forecast in Delaware
If the recent trend holds, Northern Bobwhite in Delaware is projected to fall about 100% by 2029 — from 2.2 in 2024 to a central estimate of 0.00 (95% range 0.00–14). A 5-year backtest shows a typical error of ±638.3%, with 40% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–1495% range
±638.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 14 |
| 2026 | 0.00 | 0.00 | 14 |
| 2027 | 0.00 | 0.00 | 14 |
| 2028 | 0.00 | 0.00 | 14 |
| 2029 | 0.00 | 0.00 | 14 |
Northern Bobwhite Survey Routes in Delaware
| Dover | 17 | 1987 | 1966 |
| Lowes Xrds | 17 | 1991 | 1966 |
| Blackbird | 11 | 2024 | 1994 |
| Bethany Bch | 8 | 1990 | 1966 |
| Pepperbox | 4 | 2008 | 1998 |
| Frederica | 3 | 2009 | 1966 |
| Wilmington | 2 | 2013 | 1966 |
| Holleyville | 2 | 2004 | 1966 |
| Mt Pleasant | 1 | 2013 | 1966 |
| Harrington | 1 | 2018 | 1966 |
| Frankford | 1 | 2012 | 1966 |
| Milton | 1 | 2014 | 1966 |
| Holleyville 2 | 1 | 2019 | 2006 |
| Georgetown | 1 | 2022 | 1992 |
Northern Bobwhite Population Trend in Other States
alabamaarkansascoloradoconnecticutfloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.