Species · Delaware · BBS 2025 Release · 1966–2024
Common Nighthawk Population Trend in Delaware
Common Nighthawk in Delaware has collapsed: down 89% on the route-weighted index since 1969.
-89%Since 1969
5Routes In State
21Years
Notable Common Nighthawk Trends in Delaware
long arc declinecomputed index
Common Nighthawk has collapsed in Delaware: down 89% on the route-weighted index since 1969.
Common Nighthawk Population Forecast in Delaware
If the recent trend holds, Common Nighthawk in Delaware is projected to rise about 103% by 2014 — from 0.13 in 2009 to a central estimate of 0.25 (95% range 0.00–1.9). A 5-year backtest shows a typical error of ±933.6%, with 60% of held-out values landing inside the 95% band.
+103%Change by 2014
0.25Projected 2014 index
0.00–1.995% range
±933.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2010 | 0.36 | 0.00 | 2.0 |
| 2011 | 0.33 | 0.00 | 2.0 |
| 2012 | 0.31 | 0.00 | 1.9 |
| 2013 | 0.28 | 0.00 | 1.9 |
| 2014 | 0.25 | 0.00 | 1.9 |
Common Nighthawk Survey Routes in Delaware
| Bethany Bch | 4 | 1990 | 1966 |
| Wilmington | 1 | 1967 | 1967 |
| Harrington | 1 | 2009 | 1992 |
| Dover | 1 | 1967 | 1967 |
| Milton | 1 | 1971 | 1971 |
Common Nighthawk Population Trend in Other States
alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutfloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.