The last day to vote in the California statewide special election on November 4, 2025, is Election Day itself. In California, for in-person voting, polls close at 8:00 PM local time on Election Day, so you must be in the polling line by 8:00 PM to vote. For vote-by-mail ballots, they must be postmarked by Election Day and accepted according to county procedures (many counties require ballot to be received by a certain date, often a few days after Election Day). If you needed to register or use same-day registration, those options apply at your county elections office or vote center up to Election Day in many counties under the Voter's Choice Act. Key deadlines to keep in mind (typical patterns for a statewide special election in California):

• Election Day voting: last day to cast in person is the day of the election; polling places close at 8:00 PM.
• Same-day and conditional registration: available at county elections offices or vote centers on or after the 15-day voter registration deadline, up to Election Day in many counties.
• Mail ballots: must be postmarked by Election Day and received within the window specified by the county (often within a week or two after Election Day for processing).

If you’d like, I can look up the precise deadlines for your specific county (e.g., registration cutoff, same-day registration availability, and mail ballot delivery/receipt rules) and provide a concise, county-specific summary.