Species · California · BBS 2025 Release · 1966–2024
Summer Tanager Population Trend in California
Summer Tanager in California has edged down: down 22% on the route-weighted index since 1982.
-22%Since 1982
6Routes In State
18Years
Notable Summer Tanager Trends in California
No notable trend signals for Summer Tanager in California. See the full index history below.
Summer Tanager Population Forecast in California
If the recent trend holds, Summer Tanager in California is projected to stay roughly flat through 2026, near 0.01 (95% range 0.00–0.02). A 5-year backtest shows a typical error of ±27%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2026
0.01Projected 2026 index
0.00–0.0295% range
±27%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2022 | 0.01 | 0.00 | 0.02 |
| 2023 | 0.01 | 0.00 | 0.02 |
| 2024 | 0.01 | 0.00 | 0.02 |
| 2025 | 0.01 | 0.00 | 0.02 |
| 2026 | 0.01 | 0.00 | 0.02 |
Summer Tanager Survey Routes in California
| Tecopa | 2 | 2021 | 1983 |
| Kelso Valley | 1 | 2002 | 2002 |
| Onyx | 1 | 2001 | 1995 |
| Elizabeth Lk | 1 | 1982 | 1982 |
| Pearblossom | 1 | 1997 | 1976 |
| Brawley | 1 | 1988 | 1988 |
Summer Tanager Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.