Mont. Code Ann. § 50-51-106

Any person violating any provision of this chapter or regulation made hereunder, except 50-51-107, is guilty of a misdemeanor and upon conviction thereof shall be punished by a fine of not less than $50 or more than $100 for the first offense and not less than $75 or more than $200 for the second offense and for the third and subsequent offenses not less than $200 and by imprisonment in the county jail not to exceed 90 days.