Species · Wyoming · BBS 2025 Release · 1966–2024
Forster's Tern Population Trend in Wyoming
Forster's Tern in Wyoming has fallen sharply: down 63% on the route-weighted index since 1988.
-63%Since 1988
7Routes In State
20Years
Notable Forster's Tern Trends in Wyoming
long arc declinecomputed index
Forster's Tern has fallen sharply in Wyoming: down 63% on the route-weighted index since 1988.
Forster's Tern Population Forecast in Wyoming
If the recent trend holds, Forster's Tern in Wyoming is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.06). A 5-year backtest shows a typical error of ±64.9%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2029
0.01Projected 2029 index
0.00–0.0695% range
±64.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.01 | 0.00 | 0.06 |
| 2026 | 0.01 | 0.00 | 0.06 |
| 2027 | 0.01 | 0.00 | 0.06 |
| 2028 | 0.01 | 0.00 | 0.06 |
| 2029 | 0.01 | 0.00 | 0.06 |
Forster's Tern Survey Routes in Wyoming
| Midvale | 6 | 1996 | 1996 |
| Alpine | 2 | 1999 | 1999 |
| Kaycee | 1 | 2024 | 2024 |
| Seedskadee | 1 | 2014 | 2014 |
| Nowood | 1 | 2000 | 2000 |
| Harmony | 1 | 2023 | 1987 |
| Fontenelle | 1 | 2017 | 1983 |
Forster's Tern Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.