Mont. Code Ann. § 70-24-322
Tenant to occupy as dwelling unit only -- extended absence
70-24-322 . Tenant to occupy as dwelling unit only -- extended absence. (1) Unless otherwise agreed, a tenant shall occupy the tenant's dwelling unit only as a dwelling unit.
(2) The rental agreement may require that the tenant notify the landlord of an anticipated extended absence from the premises in excess of 7 days no later than the first day of the extended absence.