Species · BCR 2 · BBS 2025 Release · 1966–2024
Tree Swallow In BCR 2
Tree Swallow in BCR 2 has increased: up 40% on the route-weighted index since 1986.
+40%Since 1986
22Routes In Region
40Years
Notable Signals
No notable trend signals for Tree Swallow in BCR 2. See the full index history below.
Forecast
If the recent trend holds, Tree Swallow in BCR 2 is projected to stay roughly flat through 2029, near 6.1 (95% range 0.00–14). A 5-year backtest shows a typical error of ±76%, with 100% of held-out values landing inside the 95% band.
+6%Change by 2029
6.1Projected 2029 index
0.00–1495% range
±76%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 6.0 | 0.00 | 14 |
| 2026 | 6.1 | 0.00 | 14 |
| 2027 | 6.1 | 0.00 | 14 |
| 2028 | 6.1 | 0.00 | 14 |
| 2029 | 6.1 | 0.00 | 14 |
Routes In BCR 2
| Togiak River | ALASKA | 91 | 2005 |
| Tupuknuk | ALASKA | 55 | 1995 |
| Kanektok Riv | ALASKA | 54 | 2005 |
| Dillingham | ALASKA | 37 | 2019 |
| King Salmon | ALASKA | 36 | 2024 |
| Gweek River | ALASKA | 15 | 2002 |
| Goodnews Bay | ALASKA | 12 | 2005 |
| Dillingham (Short) | ALASKA | 9 | 1984 |
| Kotzebue | ALASKA | 7 | 2024 |
| Kotzebue (Short) | ALASKA | 5 | 1986 |
| Katmai N.P. | ALASKA | 4 | 2022 |
| Salmon Lake | ALASKA | 4 | 2024 |
| St. Mary'S | ALASKA | 4 | 2012 |
| Chiniak | ALASKA | 3 | 2024 |
| Selawik (Short) | ALASKA | 3 | 1987 |
| Cold Bay | ALASKA | 2 | 2024 |
| Cape Nome | ALASKA | 2 | 2023 |
| Nome | ALASKA | 2 | 2022 |
| Kugarak (Short) | ALASKA | 2 | 1986 |
| Cold Bay (Short) | ALASKA | 2 | 1991 |
| Kodiak | ALASKA | 1 | 1984 |
| Kodiak 2 | ALASKA | 1 | 2006 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.