Species · South Carolina · BBS 2025 Release · 1966–2024
Black-crowned Night Heron Population Trend in South Carolina
Black-crowned Night Heron in South Carolina has fallen sharply: down 66% on the route-weighted index since 1971.
-66%Since 1971
6Routes In State
25Years
Notable Black-crowned Night Heron Trends in South Carolina
long arc declinecomputed index
Black-crowned Night Heron has fallen sharply in South Carolina: down 66% on the route-weighted index since 1971.
Black-crowned Night Heron Population Forecast in South Carolina
If the recent trend holds, Black-crowned Night Heron in South Carolina is projected to stay roughly flat through 2029, near 0.04 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±29.1%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.04Projected 2029 index
0.00–0.1595% range
±29.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.05 | 0.00 | 0.15 |
| 2026 | 0.05 | 0.00 | 0.15 |
| 2027 | 0.04 | 0.00 | 0.15 |
| 2028 | 0.04 | 0.00 | 0.15 |
| 2029 | 0.04 | 0.00 | 0.15 |
Black-crowned Night Heron Survey Routes in South Carolina
| Dale | 3 | 2013 | 2013 |
| Johns Isle | 2 | 1979 | 1967 |
| Jamestown | 1 | 1978 | 1977 |
| Hardeeville | 1 | 1986 | 1971 |
| Adams Run | 1 | 2024 | 2021 |
| Kiawah Island | 1 | 2022 | 1998 |
Black-crowned Night Heron Population Trend in Other States
alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.