Mont. Code § 23-5-161
A person who purposely or knowingly violates a provision of parts 1 through 8 of this chapter, the punishment of which is for a misdemeanor, shall upon conviction of a first offense be fined not more than $500. Upon a second conviction within 5 years of a first conviction, a person shall be fined not more than $1,000 or imprisoned in the county jail for not more than 6 months, or both. Upon a third conviction within 5 years of a second conviction, a person shall be fined not more than $10,000 or imprisoned in the county jail for not more than 1 year, or both. Upon a fourth conviction within 5 years of a third conviction, a person shall be fined not more than $10,000 or imprisoned in the county jail for not more than 1 year, or both, and the department shall revoke all licenses and permits the person holds under parts 1 through 8 of this chapter and the person is forever barred from receipt of any license or permit under this chapter. When 5 years have passed following a conviction, the record of that conviction may be made available only to criminal justice agencies or upon court order.
§ 23-5-161, MCA