10/22/2026
Montana is not a postmark state.
Some states count a mail ballot if it was postmarked by Election Day. Montana does not. Your ballot has to be in the hands of the county by 8 pm on Tuesday, November 3. A ballot that arrives Wednesday morning is not counted, no matter when you mailed it.
Twelve days out, mail only if it goes in the mailbox by Tuesday, October 27. After that, drop it off.