Mont. Code Ann. § 20-9-164

A copy of the budget amendment resolution must be published one time in a newspaper that will give notice to the largest number of people of the district as determined by the trustees, and a copy of the resolution must be posted at each schoolhouse of the district. A copy of the budget amendment resolution must also be delivered to the county superintendent and to the county clerk as the clerk of the board of county commissioners of the county. The publication, posting, and delivery of the resolution must be done not less than 1 week before the day specified in the resolution for the consideration and adoption of a budget amendment.