Probably. To vote in the state of California, you must be at least 18 years old and a state resident. You can even vote while you are still on probation. However, you cannot vote if you are in prison; on parole; currently serving a local state prison sentence in county jail; currently serving a “split” sentence (this is sometimes called “Mandatory Supervision”); or on Post Release Community Supervision ("PCRS").
For more information about where you can pick up an application to register to vote, or to register to vote online, visit California Secretary of State website.