Mont. Code § 35-16-304
If the board of directors refuses or fails for a period of 30 days to act upon a petition of withdrawal, the petitioner is entitled to apply to the district court in the county in which the land or the larger proportion of the land is situated for an order of withdrawal, and upon payment to the clerk of the court for the use and benefit of the holders of mortgages or other liens against the corporation or its membership land of the pro rata amount of the petitioner's land's liabilities, the petitioner is entitled to an order of withdrawal and release of the petitioner's land. The filing with the clerk and recorder of a duly certified copy of the order permitting withdrawal operates to release the membership land described in the order from any liens of the corporation under the provisions of this chapter.
§ 35-16-304, MCA