By California State PTA Legislative Advocacy Team
California is one of the most mail-friendly voting states in the country. Nearly every registered voter receives a ballot in the mail, and state law allows ballots to arrive up to 7 days after Election Day, as long as they are postmarked by Election Day.
That system is now under pressure from two directions at once: a quiet federal rule change at the U.S. Postal Service that took effect in December, and a U.S. Supreme Court case that could require California to rewrite its ballot receipt rules entirely — potentially before the November 2026 midterm elections.
Here’s what California State PTA members need to understand — and what you can do to make sure your vote counts.
What Changed at the Post Office
The U.S. Postal Service (USPS) clarified on December 24 that a postmark no longer necessarily reflects the date a piece of mail was dropped off. Instead, postmarks are applied when mail is processed at a regional facility — which can happen days after a ballot is placed in a mailbox or handed to a letter carrier.
This shift stems from a major USPS restructuring that has consolidated nearly 200 local mail-processing facilities into 60 regional hubs. The farther a post office is from one of those hubs, the longer the gap between when mail is dropped off and when it receives a postmark. For California, the risk of significant delay is lower than in more rural states — but it is not zero, particularly in rural and inland counties.
The practical consequence: a ballot dropped in a blue mailbox on Election Day may now be postmarked after Election Day, making it ineligible to be counted under California law.
California Secretary of State Shirley Weber called the change a direct threat to vote-by-mail, stating that it “undermines vote-by-mail voting, in turn undermining California and other elections.” Her office has updated its voter guidance accordingly (see below for what to do).
A Supreme Court Case That Could Go Further
The postmark rule change doesn’t exist in isolation. The U.S. Supreme Court is currently deciding Watson v. Republican National Committee — a case with the potential to upend mail voting rules in California and more than two dozen other states.
How the case originated: The Republican National Committee sued Mississippi over a state law that allows mail-in ballots to be counted up to five business days after Election Day, provided they were postmarked by Election Day. The RNC argued that federal law — which establishes a single Election Day for federal offices — requires ballots to be received, not just postmarked, by that date. The U.S. Court of Appeals for the Fifth Circuit agreed, and Mississippi appealed to the Supreme Court.
Where things stand: The Supreme Court heard oral arguments on March 23, 2026. The questioning revealed deep divisions among the justices. Several of the Court’s conservative members expressed sympathy for the RNC’s argument. At the same time, liberal justices raised concerns about the sweeping consequences of a ruling that could invalidate ballot-receipt grace periods in 30 states and the District of Columbia.
The Trump administration, though not a party to the case, filed a brief supporting the RNC’s position. Mississippi’s own attorney general — a Republican — defended the state law, warning that upending ballot-receipt rules in dozens of states just months before a national election “would prompt chaos.”
A decision is expected by late June or early July 2026 — just months before November’s midterm elections.
What This Means for California
California’s current law allows mail-in ballots postmarked by Election Day to be counted if they arrive within seven days after the election. That grace period is precisely what is at issue in Watson.
If the Supreme Court rules in the RNC’s favor, California would likely need to change its law so that ballots must be received — not just postmarked — by Election Day. The USPS postmark rule change compounds that risk: voters who rely on the mail and wait until close to Election Day could face a double jeopardy — a ballot that isn’t reliably postmarked on time and can no longer be counted if it arrives late.
For context: in 2024, nearly 123,000 California mail-in ballots were rejected. A USC analysis found that 27% of those arrived late. Both pressures — the USPS change and a potential Supreme Court ruling — could push that number significantly higher.
What You Can Do Right Now
Whether you’re voting in the June 3 primary or the November midterms, here’s how to protect your vote:
Use a drop box or a vote center. This is the most reliable option for returning your ballot close to Election Day. Drop boxes are available in every California county and are not affected by USPS postmark delays or any potential Supreme Court ruling on receipt deadlines. Find locations at Vote.ca.gov.
Return your ballot early. If you plan to use the mail, do it well in advance — at least one week before the deadline — to allow for processing time.
Request a manual postmark. If you must mail your ballot close to Election Day, take it inside the post office (not a drop box or blue mailbox) and ask a postal clerk to apply a manual postmark on the spot. You must ask — it is not automatic.
Track your ballot. Sign up for the Secretary of State’s Where’s My Ballot? tool at WheresMyBallot.sos.ca.gov to receive text, email, or voice notifications on the status of your ballot. If there’s a problem, you’ll have an opportunity to fix it.
California State PTA’s Commitment to Civic Participation
California State PTA has long held that the right to vote, to cast an informed vote, and to have that vote counted is fundamental to our work — and must be protected. We will continue to monitor both the USPS postmark policy and the Watson v. RNC Supreme Court case and will keep our members informed as developments occur.
In the meantime, share this information with your community. Every vote matters — and every voter deserves to know that their ballot will be counted.
For more on California State PTA’s advocacy work, visit the advocacy section of capta.org. For the latest voter information, visit the California Secretary of State’s website at sos.ca.gov.