Species · Tennessee · BBS 2025 Release · 1966–2024
Black-crowned Night Heron Population Trend in Tennessee
Black-crowned Night Heron in Tennessee has edged down: down 21% on the route-weighted index since 1968.
-21%Since 1968
6Routes In State
36Years
Notable Black-crowned Night Heron Trends in Tennessee
No notable trend signals for Black-crowned Night Heron in Tennessee. See the full index history below.
Black-crowned Night Heron Population Forecast in Tennessee
If the recent trend holds, Black-crowned Night Heron in Tennessee is projected to stay roughly flat through 2016, near 0.23 (95% range 0.00–0.76). A 5-year backtest shows a typical error of ±898.1%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2016
0.23Projected 2016 index
0.00–0.7695% range
±898.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2012 | 0.22 | 0.00 | 0.75 |
| 2013 | 0.22 | 0.00 | 0.75 |
| 2014 | 0.22 | 0.00 | 0.75 |
| 2015 | 0.22 | 0.00 | 0.76 |
| 2016 | 0.23 | 0.00 | 0.76 |
Black-crowned Night Heron Survey Routes in Tennessee
| Lovell | 3 | 1985 | 1971 |
| Walland | 2 | 1974 | 1974 |
| Belotes Bend | 2 | 2004 | 1966 |
| Jefferson Cty | 1 | 2006 | 1967 |
| Mt Olive | 1 | 2008 | 1987 |
| Peytonsville | 1 | 2011 | 2011 |
Black-crowned Night Heron Population Trend in Other States
alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.