Mont. Code Ann. § 25-3-502

Where not otherwise expressly prescribed by law, all rules, orders, and decrees of court, summonses, and notices of all kinds, whether given by any court, judge, or clerk thereof or by any other officer, board, or commission, which by the laws of this state are required to be published in any newspaper shall be published once a week during the time prescribed by law for publication thereof, whether such publication be made in a weekly, semiweekly, triweekly, or daily newspaper.