Species · Washington · BBS 2025 Release · 1966–2024
Varied Thrush Population Trend in Washington
Varied Thrush in Washington has held roughly steady: down 5% on the route-weighted index since 1970.
-5%Since 1970
60Routes In State
56Years
Notable Varied Thrush Trends in Washington
No notable trend signals for Varied Thrush in Washington. See the full index history below.
Varied Thrush Population Forecast in Washington
If the recent trend holds, Varied Thrush in Washington is projected to rise about 84% by 2029 — from 2.6 in 2024 to a central estimate of 4.8 (95% range 1.5–8.1). A 5-year backtest shows a typical error of ±89.6%, with 100% of held-out values landing inside the 95% band.
+84%Change by 2029
4.8Projected 2029 index
1.5–8.195% range
±89.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 4.8 | 1.5 | 8.0 |
| 2026 | 4.8 | 1.5 | 8.1 |
| 2027 | 4.8 | 1.5 | 8.1 |
| 2028 | 4.8 | 1.5 | 8.1 |
| 2029 | 4.8 | 1.5 | 8.1 |
Varied Thrush Survey Routes in Washington
| Mt Rainier | 34 | 2021 | 1990 |
| Mt. Adams | 22 | 2024 | 1993 |
| Cascade Riv | 21 | 2006 | 1988 |
| Cedar Falls | 19 | 2014 | 1992 |
| Glacier | 17 | 2024 | 1975 |
| Neilton | 17 | 1975 | 1975 |
| Mt St Helens | 17 | 2024 | 1992 |
| White Chuck | 16 | 2024 | 1992 |
| Sullivan Lake 2 | 14 | 2024 | 2000 |
| Index | 13 | 1997 | 1997 |
| Greenwater | 13 | 2024 | 2015 |
| Packwood | 11 | 2024 | 1975 |
| Montesand | 9 | 2013 | 1986 |
| Northport | 9 | 2007 | 1997 |
| Newhalem | 8 | 2024 | 1968 |
| Index | 8 | 1971 | 1968 |
| Bunker Hill | 8 | 2024 | 1968 |
| Snowden | 8 | 1973 | 1971 |
| Port Angeles | 7 | 2010 | 2001 |
| Suiattle Riv | 7 | 2019 | 1993 |
| Ozette | 5 | 2024 | 1971 |
| No Cascades | 5 | 2019 | 1988 |
| Index 2 | 5 | 2023 | 2014 |
| Rainier | 5 | 2010 | 2007 |
| Rimrock | 4 | 2024 | 1968 |
Varied Thrush Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.