Mont. Code Ann. § 28-2-903

28-2-903 . What contracts must be in writing. (1) The following agreements are invalid unless the agreement or some note or memorandum of the agreement is in writing and subscribed by the party to be charged or the party's agent:

(a) an agreement that by its terms is not to be performed within a year from the making of the agreement;

(b) a special promise to answer for the debt, default, or miscarriage of another, except in the cases provided for in 28-11-105 ;

(c) an agreement made upon consideration of marriage other than a mutual promise to marry;

(d) an agreement for the leasing for a longer period than 1 year or for the sale of real property or of an interest in real property. The agreement, if made by an agent of the party sought to be charged, is invalid unless the authority of the agent is in writing and subscribed by the party sought to be charged.

(e) an agreement authorizing or employing an agent or broker to purchase or sell real estate for compensation or a commission; or

(f) an agreement relating to a college athlete's student-athlete rights, as defined in 20-1-232 , including but not limited to a student's name, image, and likeness.

(2) Evidence of an agreement described in subsections (1)(a) through (1)(f) is not admissible without the writing or secondary evidence of the writing's contents.

(3) Evidence is not admissible to charge a person upon a representation as to the credit of a third person unless the representation or some memorandum of the representation is in writing and either subscribed by or in the handwriting of the party to be charged.

(4) Subsections (1) and (2) do not apply to agreements subject to the Uniform Commercial Code.