Species · California · BBS 2025 Release · 1966–2024
Ruby-crowned Kinglet Population Trend in California
Ruby-crowned Kinglet in California has collapsed: down 75% on the route-weighted index since 1970.
-75%Since 1970
58Routes In State
50Years
Notable Ruby-crowned Kinglet Trends in California
long arc declinecomputed index
Ruby-crowned Kinglet has collapsed in California: down 75% on the route-weighted index since 1970.
Ruby-crowned Kinglet Population Forecast in California
If the recent trend holds, Ruby-crowned Kinglet in California is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±80%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2029
0.01Projected 2029 index
0.00–0.1395% range
±80%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.14 |
| 2026 | 0.02 | 0.00 | 0.14 |
| 2027 | 0.02 | 0.00 | 0.14 |
| 2028 | 0.01 | 0.00 | 0.14 |
| 2029 | 0.01 | 0.00 | 0.13 |
Ruby-crowned Kinglet Survey Routes in California
| Korbel | 9 | 1987 | 1977 |
| Genesee | 8 | 2019 | 1972 |
| Hay Fork | 7 | 2017 | 2003 |
| Johnsville | 6 | 2019 | 2018 |
| Fallsvale | 6 | 1970 | 1970 |
| Navarro | 5 | 1993 | 1981 |
| Madeline | 4 | 2002 | 1998 |
| Laytonville | 4 | 2001 | 1995 |
| Last Chance | 4 | 2019 | 2019 |
| Meadow Valley | 3 | 2021 | 1999 |
| Lake Success | 3 | 1977 | 1974 |
| Hat Creek | 3 | 1991 | 1991 |
| Shasta Lake | 3 | 2012 | 1981 |
| Lakeshore | 3 | 2004 | 1972 |
| Sisquoc | 3 | 2012 | 1970 |
| Kings Canyon | 2 | 1985 | 1985 |
| Calpella | 2 | 1968 | 1968 |
| Cottage Spgs | 2 | 1968 | 1968 |
| Dardanelle | 2 | 2006 | 1973 |
| Bass Lake | 2 | 1981 | 1977 |
| Likely | 2 | 1973 | 1973 |
| Jackson | 2 | 1972 | 1972 |
| Foster Park | 2 | 1974 | 1974 |
| Orange Cove | 2 | 1977 | 1977 |
| Tahoe Nf | 2 | 1993 | 1993 |
Ruby-crowned Kinglet Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.