Mont. Code Ann. § 7-2-4405

The clerk of the municipality shall forthwith cause to be published in the newspaper nearest such land, at least once a week for 2 successive weeks, a notice that such resolution has been duly and regularly passed and that for a period of 20 days after the first publication of such notice, such clerk will receive expressions of approval or disapproval, in writing, of the proposed alterations of the boundaries of the municipality. Said notice shall also state the time and place set for the public hearing on the proposed annexation.