Species · California · BBS 2025 Release · 1966–2024
Sagebrush Sparrow Population Trend in California
Sagebrush Sparrow in California has fallen sharply: down 62% on the route-weighted index since 1974.
-62%Since 1974
14Routes In State
49Years
Notable Sagebrush Sparrow Trends in California
long arc declinecomputed index
Sagebrush Sparrow has fallen sharply in California: down 61% on the route-weighted index since 1974.
Sagebrush Sparrow Population Forecast in California
If the recent trend holds, Sagebrush Sparrow in California is projected to fall about 75% by 2029 — from 0.15 in 2024 to a central estimate of 0.04 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±64.3%, with 100% of held-out values landing inside the 95% band.
-75%Change by 2029
0.04Projected 2029 index
0.00–0.2295% range
±64.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 0.23 |
| 2026 | 0.04 | 0.00 | 0.23 |
| 2027 | 0.04 | 0.00 | 0.22 |
| 2028 | 0.04 | 0.00 | 0.22 |
| 2029 | 0.04 | 0.00 | 0.22 |
Sagebrush Sparrow Survey Routes in California
| Bartle | 36 | 1977 | 1977 |
| Honey Lake | 13 | 2024 | 1972 |
| Ingalls | 3 | 2000 | 1985 |
| Macdoel | 3 | 1977 | 1977 |
| Mt Shasta | 3 | 1975 | 1975 |
| Cedarville | 3 | 2001 | 1974 |
| Davis Creek | 2 | 2001 | 1977 |
| Dorris | 2 | 1976 | 1976 |
| Lassen Park | 2 | 1981 | 1981 |
| Ravendale | 1 | 2024 | 1974 |
| Clear Lk Res | 1 | 1997 | 1974 |
| Tionesta | 1 | 2021 | 2012 |
| Likely | 1 | 1979 | 1972 |
| Madeline | 1 | 2002 | 2002 |
Sagebrush Sparrow Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.