California Vote by Mail: Returning, Deadlines, and Signatures

If you’re registered to vote in California and your registration is active, you don’t have to do anything to get a mail ballot. Voting by mail in California is automatic: your county elections office mails a ballot to every active registered voter at least 29 days before each election, with prepaid postage on the return envelope. You can send it back by mail, drop it in a ballot drop box, or hand it in at any polling place or vote center in your county.

Who Gets a Ballot Automatically

Under Elections Code Section 3000.5, county elections officials mail a ballot packet to every registered voter for every primary, general, and special election. Mailing has to begin no later than 29 days before election day, and officials have five days to get ballots out to everyone on the rolls at that point. If you register later, your ballot goes out within five days of your registration being processed.¹

One catch: voters with inactive registration status don’t get a ballot. Your registration can go inactive if you haven’t voted in recent elections and haven’t responded to a confirmation mailing from your county. Check your status through the Secretary of State’s voter registration lookup, and update your address or name if anything has changed.

Registration Deadlines

The standard deadline to register or update your registration is 15 days before the election. For the June 2026 primary, that falls on May 18, 2026.²

If you miss it, you can still register and vote through Conditional Voter Registration. You complete the process at your county elections office, any polling place, or a vote center within 14 days of the election, including on election day itself. Your ballot is counted once the county verifies your registration.³

Filling Out the Ballot and Envelope

The packet contains the ballot, a secrecy sleeve, and a return envelope with prepaid postage.⁴ Use blue or black ink and fill in the selection bubbles completely. Skip red ink and pencil; they cause problems with the high-speed scanners that read ballots.

The return envelope is where most avoidable rejections happen. To be valid under Section 3011, it needs your signature on the designated line, the date you signed, and your residence address, which should match the address on your voter registration. The envelope carries a pre-printed declaration under penalty of perjury that you live in the precinct and are the person named on it, along with printed warnings that voting twice is a crime and that your signature will be compared against your registration record.

Slide the completed ballot into the secrecy sleeve, place it in the return envelope, and seal it. Missing the signature is the single fastest way to have your ballot flagged.

Ways to Return Your Ballot

By Mail

Every return envelope comes with prepaid postage, so any mailbox or post office will do.⁴ USPS recommends mailing your completed ballot at least one week before the deadline to be sure it arrives in time.⁵ A ballot dropped in the mail the day before an election might not get postmarked and delivered within the required window.

Drop Boxes

Counties place secure, locked drop boxes at public locations throughout their jurisdictions. They open when mail ballots go out and stay available until 8:00 p.m. on election day. Some are staffed during limited hours; others are unstaffed and accessible around the clock. Counties must publish all drop box locations at least 30 days before the election, both in the voter information guide mailed to your home and on the county elections website.⁶ Drop boxes take the postal system out of the equation entirely, so postmark timing stops mattering.

In Person

You can hand-deliver your sealed ballot to any polling place or vote center in your county, or to the county elections office, anytime between 7:00 a.m. and 8:00 p.m. on election day.²

Having Someone Else Return It

If you can’t return the ballot yourself, you can authorize another person to do it. That person has to sign the return envelope and print their name on it. California doesn’t cap how many ballots one person can return and doesn’t require them to be a family or household member. The one hard rule: the person returning your ballot cannot be paid based on how many ballots they collect or turn in.⁷

The Deadlines That Actually Decide Whether Your Ballot Counts

A ballot returned by mail is valid if two things are true: it’s postmarked on or before election day, and the county receives it within seven days after election day. If the postmark is missing or unreadable, the county looks at the date you wrote on the envelope. If that date is on or before election day, the ballot can still count.⁸ That’s another reason to fill in the date on the envelope.

For drop boxes and in-person delivery, the deadline is 8:00 p.m. on election day, period. Drop boxes lock and polling places close. If voters are still in line at a drop box at 8:00 p.m., the box stays open until everyone who was already there has deposited a ballot.⁶

If Your Ballot Doesn’t Arrive or Gets Ruined

If your ballot never shows up, gets damaged, or you make a mistake filling it out, request a replacement from your county elections office. Only you, the registered voter, can make that request; it’s a criminal offense for someone else to request a replacement on your behalf.⁹ Go straight to your county; sending the request to the Secretary of State’s office slows things down. If election day is close and mail won’t be fast enough, go in person to your county elections office or a vote center to pick up a new ballot or vote provisionally.

Signature Verification and How to Fix a Problem

Every return envelope goes through signature verification. Staff compare the signature on the envelope against signatures stored in your voter registration record, which often include a signature from your driver’s license or a previous registration form.¹⁰ Your ballot won’t be rejected for a signature mismatch unless two additional elections officials each independently conclude, beyond a reasonable doubt, that the signature differs in multiple significant and obvious ways from every signature in your file.¹¹

If your signature is flagged as mismatched or missing, the county has to notify you within 24 hours of finding the problem. You’ll get a notice explaining what happened and a signature verification statement with a prepaid return envelope, which you can send back by mail, fax, email, or in person.¹⁰

For a regularly scheduled statewide election, you have until 5:00 p.m. on the 22nd day after the election to cure a signature. For other elections, the deadline is 5:00 p.m. two days before the county certifies results. The county must send its notice no later than 14 days after a statewide election, or eight days before certification for other elections.¹¹ Respond as soon as the notice arrives.

Tracking Your Ballot

California’s “Where’s My Ballot?” service, powered by BallotTrax, follows your ballot from the moment it’s mailed through final counting. You can sign up for notifications by text, email, or voice call through the Secretary of State’s website. Alerts go out when your ballot is mailed, when the county receives it back, and when it’s accepted and counted. If there’s a signature problem, you’ll be notified through the same system. Enrollment is free.

Changing Your Mind and Voting in Person

Getting a mail ballot doesn’t lock you into using it. You have three options if you’d rather vote in person:

Bring your unused mail ballot to any polling place or vote center in your county. A poll worker will take it and issue you a regular polling place ballot.
If you’ve already filled out the mail ballot, bring the sealed envelope to the polling place and hand it to a poll worker.
If you don’t bring your mail ballot materials at all, you can vote provisionally. Your ballot will be counted once the county confirms you didn’t also submit a mail ballot.

The provisional route works but takes longer to process. If you already know you want to vote in person, bringing your mail ballot materials makes the trip faster.¹²

1
California Legislative Information. California Code Elections Code 3000-5
2
California Secretary of State. Election Dates and Resources
3
California Secretary of State. Same Day Voter Registration (Conditional Voter Registration)
4
California Legislative Information. California Code Elections Code 3010
5
United States Postal Service. Election Mail
6
California Secretary of State. Vote-by-Mail Ballot Drop Boxes and Vote-by-Mail Drop-Off Locations
7
California Department of Justice – Office of the Attorney General. Attorney General Bonta Issues Bulletin on Third-Party Collection of Voter Ballots and Unofficial Ballot Drop-Off Containers
8
California Legislative Information. California Code Elections Code 3020
9
California Secretary of State. Replacement Ballot Application
10
California Secretary of State. Signature Verification, Ballot Processing, and Ballot Counting Emergency Regulations
11
California Legislative Information. California Code Elections Code 3019
12
California Secretary of State. Voting at a Polling Place after Applying to Vote by Mail