Mont. Code Ann. § 61-8-724
61-8-724 No-passing zone violation -- penalty
61-8-724 . No-passing zone violation -- penalty. A person convicted of a violation of 61-8-326 shall be punished upon conviction by imprisonment for a period of not more than 6 months or by a fine of not less than $50 or more than $500 or by both fine and imprisonment.