States Draft Contingency Plans as Supreme Court Weighs End to Late-Arriving Mail Ballots

725,000 Mail Ballots Could Be Void If Supreme Court Ends Late-Arrival Rule

• At least 725,000 ballots arrived after Election Day but within state grace periods in 2024.
• Eighteen states and territories currently accept ballots postmarked by Election Day that arrive up to five days later.
• Conservative justices signaled skepticism, pushing 18 top election chiefs to draft contingency plans.
• A June ruling would leave officials only four months to rewrite voter instructions before midterms.

Justice Kavanaugh’s June timeline forces states into emergency planning mode.

SUPREME COURT—Minutes after Monday’s Supreme Court arguments on Mississippi’s five-day ballot grace period, Nevada Secretary of State Francisco Aguilar dialed his deputy with a blunt directive: “We need a road map for the county clerks—now.” The conservative majority’s questioning convinced Aguilar that late-arriving mail ballots—currently legal in 18 states and territories—may soon be invalidated nationwide.

The potential upheaval reaches far beyond one state. In 2024 at least 725,000 ballots across 14 states arrived in the post-Election Day window that the Court could abolish, according to data obtained by The New York Times. With a ruling expected as late as June, election administrators must rewrite voter instructions, redesign return envelopes and retrain thousands of local officials in fewer than 120 days.

“We can’t wait for the opinion,” Aguilar, a Democrat, said in an interview. “Voters need certainty before absentee ballots drop in September.”

Inside the Courtroom: Conservative Justices Cast Doubt on Grace Periods

During the 70-minute argument in Mills v. Mississippi, the Court’s conservative bloc pressed attorneys for civil-rights groups on why a state must accept ballots that arrive after the statutory close of Election Day. Chief Justice John Roberts noted that federal law sets a single nationwide election date, suggesting that ballots arriving later “extend the franchise beyond the Election Day Congress established.”

Justice Samuel Alito echoed that point, asking whether states that currently allow late-arriving ballots had effectively created “a rolling election.” Legal scholars say such language signals the Court may impose a uniform nationwide rule requiring ballots to be in election offices by 8 p.m. local time on Election Day.

“The questioning was unusually pointed,” said Richard Hasen, a UCLA election-law professor who attended the argument. “If the Court applies a strict textualist reading, Mississippi’s five-day grace period—and every similar rule—could be toast.”

Seventeen other states and territories—including California, Illinois, Nevada and Washington—use comparable windows ranging from one to seven days. All told, more than 40 million voters live in jurisdictions that could be forced to shorten deadlines overnight.

What a ruling could look like

The justices have several options. They could issue a narrow decision striking only Mississippi’s statute, allow states to keep existing rules for the 2026 midterms, or declare all post-Election Day ballot acceptance unconstitutional. Election officials say the third option would create the greatest chaos because it would invalidate current practices without providing a transition period.

Justice Brett Kavanaugh hinted at the tight calendar, telling Mississippi’s solicitor general, “We’re aware of the election-season realities,” and noting that the Court’s term ends in June. Any later decision would collide with absentee-ballot mailings for September primaries.

“That single sentence sent chills through the community of state election directors,” said Tammy Patrick, a former federal compliance officer who now advises bipartisan state associations. “It means they’re thinking of dropping a major change weeks before ballots go out.”

The 725,000 Ballot Question: Where Late Votes Are Legal

Data collected by The New York Times from 14 states shows that 725,000 ballots arrived after polls closed on Election Day 2024 yet were lawfully counted because they bore timely postmarks. California alone accepted 412,000 such ballots, while Illinois processed 97,000 and Washington tallied 83,000.

Those figures understate the scale because Texas, Pennsylvania and Georgia—states with large vote-by-mail programs—declined to provide data. Including them, election experts estimate the true nationwide figure exceeds one million.

“That’s not a rounding error; it’s a constituency,” said Charles Stewart III, director of MIT’s Election Data and Science Lab. “If you eliminate that category, you’re disenfranchising more people than the margin that decided the popular vote in several recent presidential states.”

Supporters of stricter deadlines argue that finality on election night is essential for public confidence. “We have to balance convenience with integrity,” Mississippi Secretary of State Michael Watson told reporters after the argument. “Counting votes that show up days later undermines the idea of a single Election Day.”

Partisan split over late ballots

Of the 18 jurisdictions with grace periods, 14 are led by Democratic governors and secretaries of state. Critics say the rule disproportionately benefits Democrats because urban and younger voters—core party constituencies—are more likely to vote by mail. Yet data from California’s 2024 election show late-arriving ballots split almost evenly between congressional districts carried by either party, according to a Caltech analysis.

“The partisan narrative is more complicated than campaign talking heads admit,” said Stewart, who co-authored the study. “Still, if the Court kills grace periods, the burden will fall hardest on densely populated counties that process the bulk of mail ballots—precisely where Democrats run up their margins.”

How Nevada Plans to Handle a June Surprise

Nevada’s current law gives voters a three-day grace period if the ballot is postmarked by Election Day. Secretary Aguilar has already convened a 12-member task force of county clerks, IT directors and postal liaisons to draft contingency language that could be inserted into the 2026 official voter guide “within 72 hours of a Supreme Court order,” according to an internal planning memo shared with The Times.

The biggest hurdle is voter education. In 2024, Nevada mailed 1.2 million absentee ballots; 41,000 came back during the grace window. “If we lose those three days, we need every voter to understand the new hard deadline,” Aguilar said. His office has requested $1.8 million from the legislature for a paid-media blitz—TV, radio and digital ads in English and Spanish—plus direct-mail postcards to every active voter.

Yet the legislature does not reconvene until 2027, so Aguilar must tap emergency contingency funds that require approval from the state’s Interim Finance Committee. Republican members have signaled resistance, arguing that Democrats should have foreseen the legal risk when they expanded vote-by-mail in 2020.

Logistics of a shorter window

Clark County—home to 72 percent of Nevada’s electorate—would shoulder the heaviest lift. The registrar’s office processes roughly 500,000 mail ballots. Joe Gloria, the county clerk, said he would need to reprogram signature-scanning software, redesign ballot-return envelopes and retrain 1,200 temporary election workers. “That’s a six-week sprint if nothing goes wrong,” Gloria said.

Postal coordination adds another layer. The U.S. Postal Service advises voters to mail ballots no later than seven days before Election Day. If the grace period disappears, Aguilar’s office will ask USPS to prioritize election mail and extend final collection times at Las Vegas and Reno sorting hubs on the night before the election.

“We’re essentially rebuilding our election infrastructure in public view,” said Mark Wlasits, a former Virginia election official advising Nevada. “Failure means disenfranchisement on live television.”

Could a Ruling Flip House Seats? Battleground Scenarios

Non-partisan analysts have identified at least nine House districts where the 2024 margin of victory was smaller than the number of late-arriving mail ballots. In California’s 22nd District—decided by 1,842 votes—2,430 late ballots were accepted. In Nevada’s 1st District, the gap was 3,012 votes versus 4,110 late ballots.

“If those ballots vanish, incumbents who won by razor-thin margins could start their victory speeches all over again,” said David Wasserman, House editor for the Cook Political Report. He rates four districts currently held by Democrats as Toss-Ups where a stricter deadline would erase a built-in cushion.

Republicans frame the issue as leveling the playing field. “Every day after Election Day that ballots trickle in undermines confidence,” said National Republican Congressional Committee spokesman Mike Berg. “Voters deserve to know the results on election night.”

Democrats counter that the change would amount to voter suppression. “It’s a poll tax paid in postmark ink,” said California Secretary of State Shirley Weber. Her office projects that eliminating the grace period would reduce overall turnout by 1.8 percent, concentrated among Latino and Asian-American voters.

Down-ballot ripple effects

Local races could flip as well. In 2024, a Nevada state senate seat was decided by seven votes; 312 late ballots were counted. A Los Angeles school-board race saw a 42-vote margin with 1,900 late ballots accepted. “When you shrink the electorate, you magnify random events—weather, postal slowdowns, even printer jams,” said Mindy Romero, director of USC’s Center for Inclusive Democracy.

Both parties are gaming out legal challenges. Democratic attorneys have quietly drafted complaints arguing that a June ruling amounts to an unconstitutional “election year bait-and-switch.” Republicans, meanwhile, are preparing suits to force immediate implementation should the Court allow the practice to stand. “We’ll be ready either way,” said Alabama Secretary of State Wes Allen, chair of the Republican State Leadership Committee’s elections portfolio.

What Happens Next? June, September and the 2026 Midterms

Should the Court issue its opinion in late June, states will enter a compressed timetable. Absentee ballots for September primaries must be mailed by August 15 under federal MOVE Act requirements, giving officials 45 days to rewrite voter guides, update websites and train poll workers. “It’s like rebuilding an airplane while it’s taxiing,” said Vermont Secretary of State Sarah Copeland Hanzas.

Congress could intervene, but prospects are dim. A Democratic bill to codify a three-day grace period passed the House in 2025 but stalled in the Senate amid GOP opposition. Senator Joe Manchin has signaled he would not support a carve-out from the filibuster for voting-rights legislation, effectively killing federal insurance against a Supreme Court ruling.

State legislatures are equally gridlocked. Only five of the 18 affected states have regular sessions that run through summer; the rest would need special sessions, which require bipartisan consent. In Nevada, Republican leaders have already rejected Aguilar’s request for an emergency session, arguing that voters can simply mail ballots earlier.

Litigation waiting in the wings

Both parties have war-room maps that highlight potential post-ruling lawsuits. Democrats plan to argue that a June cutoff violates due-process protections because voters relied on existing rules when they requested absentee ballots. Republicans will counter that the Constitution’s Elections Clause gives state legislatures plenary power to set deadlines, regardless of reliance interests.

“We’re headed for a patchwork of conflicting court orders,” said Adav Noti, chief legal officer at the Campaign Legal Center. He predicts that the final arbiter could be the Supreme Court—again—this time on an expedited schedule reminiscent of Bush v. Gore.

Meanwhile, election officials are quietly gaming out worst-case scenarios: a ruling released September 1, the day before absentee ballots are scheduled to drop. “At that point we’d have to decide whether to defy the Court or disenfranchise voters,” said one swing-state director who requested anonymity because of the sensitivity. “Neither option is palatable in a democracy.”