Montana Primary Voting Opens Under New ID and Registration Rules
Why It Matters
Montana voters heading into the 2026 primary election are navigating a set of new requirements that affect how they identify themselves at the polls, when they can register, and how they return mail-in ballots. The changes are already creating a learning curve — and county election officials are working to make sure ballots don’t get thrown out over missing details.
What Happened
As school election ballots began arriving at the Yellowstone County Elections Office this week, administrators quickly spotted a pattern: a large number of mail voters had failed to include their birth year on return envelopes, as now required under Montana law. Yellowstone County Elections Administrator Dayna Causby said her office sent out more than 1,500 notifications to voters whose envelopes were missing either a signature or, more commonly, a birth year in the designated orange squares below the signature line.
The birth-year requirement was first introduced for Montana’s 2025 municipal elections and extended to school elections this cycle. With primary absentee ballots set to be mailed out Friday, the compliance challenge is only expected to grow. “I have people who voted last fall who still forgot their birth year. I have an election worker in my office who didn’t include her birth year,” Causby said.
Of the 1,531 potentially rejected ballots in Yellowstone County, roughly 216 were resolved before officials began counting school election results Tuesday evening. Voters had until 5 p.m. Wednesday to correct problems and have their votes counted.
New ID Rules at the Polls
For in-person primary voters, Montana now requires an officially recognized form of identification to receive a ballot. Accepted forms include a Montana driver’s license or state ID, military ID, tribal ID, U.S. passport, concealed carry permit, or a student ID from a Montana University System school or NCAA member institution.
Voters may also present a current utility bill, bank statement, or government document showing their name and address — combined with a photo ID that includes their name. Previously, any photo ID was sufficient, making this a meaningful tightening of the standard.
Registration Deadlines Tightened
Montana has also changed its voter registration timeline in ways that Ravalli County Elections Administrator Regina Plettenburg said voters need to understand before showing up on Election Day.
Under the previous system, Montanans could register to vote all the way through the close of polls on Election Day — a window that in some cases stretched resolution of late-registration lines into the early hours of the following morning. Under the new rules, county offices will be open all day the Saturday before Election Day to handle new registrations and registration updates such as address changes. On Election Day itself, registration will close at noon.
County election officials pushed for the change after years of logistical strain caused by last-minute registration surges. The reforms align Montana more closely with standard practices in other states. Republican and independent candidates are already outraising Democrats in federal races heading into the primary, suggesting strong engagement on the right this cycle.
Legal Challenges Ongoing
The new voter ID and registration requirements are not without opposition. Multiple voting rights organizations have filed suit against Montana’s secretary of state seeking to overturn the laws. That litigation is ongoing, meaning a court could block or invalidate portions of the new rules at any point during the 2026 election cycle.
The birth-year requirement was the first piece of the new framework to take effect because it applies exclusively to mail-in elections — school and municipal races — where no in-person registration accommodation was necessary.
By the Numbers
- 1,531 — potentially rejected school election ballots flagged in Yellowstone County
- 216 — ballots resolved before counting began Tuesday
- 5 p.m. Wednesday — deadline for voters to correct ballot deficiencies
- Noon on Election Day — new cutoff for same-day voter registration
- Friday — date primary absentee ballots are set to be mailed to registered absentee voters
What’s Next
With primary absentee ballots going out this week, election administrators are bracing for another wave of envelopes missing birth years. Officials are urging voters to carefully review the instructions on their return envelopes before sealing and mailing them. Some Republican legislative candidates have drawn donations from longtime Democratic donors this cycle, signaling unusual cross-party interest as the primary gets underway. The court challenge to the new ID and registration laws remains the key wildcard, with any ruling potentially reshaping the rules mid-cycle.
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