Mont. Code § 81-4-323
When a petition praying that any established horse herd district be dissolved is filed with the county clerk and recorder of the county wherein such district has been established, and it is set forth therein that such petition is signed by the owners or possessors of 55% or more of the lands lying within such district, the county clerk and recorder shall call such petition to the attention of the board of county commissioners of the county at its next regular meeting. At said meeting by its order the board shall set such petition for hearing at a specified time on a day certain of which notice shall be given by publication at least once in each week, for 3 successive weeks in some newspaper of general circulation in the county. At the time fixed for hearing the board of county commissioners shall first require proof of publication of the notice of said hearing to be made and thereafter shall consider the petition and hear all interested parties. At the conclusion of any such hearing, if the board of county commissioners shall find that notice of the hearing has been given in the manner and for the time prescribed herein and that the owners or possessors of 55% or more of the lands lying within such herd district have signed the petition and request that such district be dissolved, then the said board shall forthwith spread such findings upon its minutes and thereupon shall enter an order in terms that by reason of such findings and of the proceedings had upon such petition the said horse herd district is thereby dissolved. Forthwith upon the making and entry of any such order aforesaid the horse herd district affected thereby shall be dissolved for all purposes thereafter.
§ 81-4-323, MCA