Mont. Code Ann. § 7-2-4707

The governing body of any municipality desiring to annex territory under the provisions of this part shall first pass a resolution stating the intent of the municipality to consider annexation. Such resolution shall describe the boundaries of the area under consideration and fix a date for a public hearing on the question of annexation, the date for such public hearing to be not less than 30 days and not more than 60 days following passage of the resolution.