Nearly 150,000 Mail Ballots Rejected in California Primary as Late Arrivals Drive Sharp Increase

Nearly 150,000 mail ballots were rejected during California’s June 2026 primary election, highlighting ongoing concerns about ballot delivery, voter participation, and election administration as the state prepares for the November general election.According to the California Secretary of State, 148,241 vote-by-mail ballots were rejected out of millions cast statewide. While the rejection rate remained relatively low overall, the total number of rejected ballots was significantly higher than in previous statewide primary elections, drawing attention from election officials and voting rights advocates.

Late Ballots Were the Leading Cause

The overwhelming majority of rejected ballots were discarded because they arrived too late to be counted under California law. State election rules require mailed ballots to be postmarked on or before Election Day and received by county election offices within the state’s legal deadline.Officials reported that more than 93,000 ballots failed to meet those requirements, making late arrival the most common reason ballots were rejected. Election experts say several factors may have contributed to the increase, including mail delivery delays and inconsistencies in how ballots receive postmarks during processing. While no single cause has been identified, postal delivery has become an increasing focus in election administration discussions nationwide.

Other Reasons Ballots Were Rejected

Not all rejected ballots were the result of late delivery. Election officials also rejected ballots for missing voter signatures, signatures that did not match voter registration records, duplicate voting attempts, damaged or incomplete ballot envelopes, and other administrative issues that prevented the ballots from being legally counted.California allows many voters to correct signature-related issues through a ballot “curing” process before election results are certified. However, ballots that arrive after the legal deadline generally cannot be corrected or counted.

California Continues to Rely on Vote-by-Mail

California remains one of the nation’s largest vote-by-mail states. Every active registered voter automatically receives a mail ballot, giving residents the option to vote from home, return ballots through secure drop boxes, mail them back, or vote in person.The system has significantly expanded voter access over the past several election cycles, but the latest rejection figures illustrate that timely ballot return remains essential despite the state’s extended receipt window.Election officials continue encouraging voters to return ballots as early as possible rather than waiting until Election Day to reduce the risk of delivery delays.

Focus Turns to November

With the general election only months away, state and local election officials are reviewing the primary results to determine whether additional voter education or administrative improvements could help reduce ballot rejections.Voting rights organizations have also called for continued monitoring of mail delivery performance and ballot processing procedures to ensure eligible voters are not unintentionally disenfranchised.Despite the increase in rejected ballots, election officials stress that California’s overall vote-by-mail system continues to process and count the vast majority of ballots successfully. The state’s election infrastructure includes signature verification, ballot tracking, and post-election audits designed to protect both voter access and election integrity as preparations begin for November.