Species · Colorado · BBS 2025 Release · 1966–2024
Black Tern Population Trend in Colorado
Black Tern in Colorado has held roughly steady: down 6% on the route-weighted index since 1993.
-6%Since 1993
4Routes In State
16Years
Notable Black Tern Trends in Colorado
No notable trend signals for Black Tern in Colorado. See the full index history below.
Black Tern Survey Routes in Colorado
| Briggsdale | 15 | 1995 | 1995 |
| Alamosa | 9 | 2023 | 1989 |
| Julesburg | 4 | 2002 | 2002 |
| Edler | 1 | 1994 | 1994 |
Black Tern Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.