Species · California · BBS 2025 Release · 1966–2024
Greater Roadrunner Population Trend in California
Greater Roadrunner in California has collapsed: down 80% on the route-weighted index since 1970.
-80%Since 1970
96Routes In State
56Years
Notable Greater Roadrunner Trends in California
long arc declinecomputed index
Greater Roadrunner has collapsed in California: down 80% on the route-weighted index since 1970.
Greater Roadrunner Population Forecast in California
If the recent trend holds, Greater Roadrunner in California is projected to fall about 89% by 2029 — from 0.07 in 2024 to a central estimate of 0.01 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±96.5%, with 100% of held-out values landing inside the 95% band.
-89%Change by 2029
0.01Projected 2029 index
0.00–0.2095% range
±96.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.22 |
| 2026 | 0.02 | 0.00 | 0.22 |
| 2027 | 0.02 | 0.00 | 0.21 |
| 2028 | 0.01 | 0.00 | 0.21 |
| 2029 | 0.01 | 0.00 | 0.20 |
Greater Roadrunner Survey Routes in California
| Cima | 6 | 2021 | 1970 |
| Alamo River | 3 | 1994 | 1973 |
| Brawley | 3 | 2010 | 1971 |
| Buena Vista | 3 | 2017 | 1990 |
| Ubehebe | 2 | 1987 | 1987 |
| Mt Pinos | 2 | 1994 | 1985 |
| Inyokern | 2 | 2024 | 1989 |
| Ivanpah | 2 | 1994 | 1989 |
| Big Bear | 2 | 1981 | 1981 |
| Essex | 2 | 1994 | 1989 |
| Niland | 2 | 2023 | 1973 |
| Blythe | 2 | 2003 | 1976 |
| Maricopa | 2 | 1993 | 1970 |
| Sanger | 2 | 2021 | 2021 |
| Kelso Valley | 2 | 2022 | 1974 |
| Red Bluff | 1 | 1979 | 1978 |
| Tres Pinos | 1 | 2003 | 2003 |
| Oilfields | 1 | 1999 | 1999 |
| Gravesboro | 1 | 1974 | 1974 |
| Wildrose | 1 | 1979 | 1978 |
| Parkfield | 1 | 2022 | 2022 |
| Bakersfield | 1 | 1997 | 1968 |
| Onyx | 1 | 2001 | 1968 |
| Calif City | 1 | 2015 | 1978 |
| Goldstone | 1 | 2009 | 1968 |
Greater Roadrunner Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.