California voters reject a proposition that would have suspended indefinitely the operation of that state's cap-and-trade bill, Global Warming Solutions Act of 2006, known as "AB 32".
- More than a dozen wildfires around Mendocino, Napa, Sonoma, and Yuba counties in California, kill at least ten people, destroy at least 1500 homes and businesses, and force 20 thousand people to evacuate. The Governor of California, Jerry Brown, declares a state of emergency.
- Governor Jerry Brown signs legislation to make California a sanctuary state. Next January, this law will prevent police from inquiring about immigration status during routine interactions, and will reduce law enforcement cooperation with U.S. immigration officers.
- Among the property damage from the wildfires in California is the Santa Rosa home of "Peanuts" creator Charles M. Schulz; his widow was evacuated Monday. "Peanuts" featured the characters Snoopy and Charlie Brown.
- California moves its 2020 presidential primary to March 3, making it fifth in the nominating process after Iowa, New Hampshire, Nevada, and South Carolina. The 2016 primary was held on June 7.
- California passes a bill that will move the primaries to March near Super Tuesday.