Mont. Code Ann. § 27-32-201

Upon the filing of this petition with the clerk of the district court, an order shall be made by the court or judge thereof fixing the date of the hearing of the petition and directing that notice of such hearing be given as in such order set forth. Notice shall be given by posting in three public places within the county for a period of not less than 10 or more than 30 days, as the court, in its discretion, shall determine.