Irretrievable breakdown of the marriage and living separate and apart for 180 days prior to filing are the only grounds for dissolution of marriage in Montana.
The following factors must be met to satisfy the grounds for dissolution of marriage:
Simplified or Special dissolution of marriage procedures: Joint petitions for dissolution of marriage are allowed. In such cases, both spouses should be titled as “Co-Petitioners” on the petition. In addition, separation or settlement agreements are specifically authorized by law.
Irretrievable breakdown of the marriage is the only grounds for legal separation in Montana divorce law. One of the spouses must be a resident of Montana for 90 days immediately prior to filing for legal separation.