Mont. Code Ann. § 13-1-404
13-1-404 Deadline for absentee ballots and mail ballots
13-1-404 . Deadline for absentee ballots and mail ballots. (1) Pursuant to 13-13-205 , ballots for a local government election must be:
(a) available for absentee voting in person at least 30 days before election day; and
(b) mailed to absentee voters at least 25 days prior to election day.
(2) Pursuant to 13-19-207 , ballots for a local government election conducted by mail must be mailed no sooner than the 20th day and no later than the 15th day before election day.