Mont. Code § 81-4-504
Notice of the roundup shall be given by the board of county commissioners at least 30 days before the date when the roundup begins. The notices shall be published at least once a week for 3 successive weeks in some newspaper of general circulation, printed and published in the county in which the roundup is to be held, if a newspaper of this type is printed and published in the county. The notice shall be posted in at least five public places outside of the county seat of the county on public highways in the county or district, as the case may be, in which the roundup is to be held. Three notices shall be posted in three public places in the county seat. One of the notices shall be posted at the front door of the courthouse. The notices posted outside of the county seat are to be posted not less than 2 miles apart, and all posted notices are to be posted at least 20 days before the date on which the roundup begins as stated in the notice. If no newspaper is printed and published in the county, publication in a newspaper is not required. At least 20 days before the date on which the roundup is to begin, a copy of the notice shall be filed with the department by the clerk of the board of county commissioners.
§ 81-4-504, MCA