Mont. Code Ann. § 41-1-305
Minor may not disaffirm contract for necessaries
41-1-305 . Minor may not disaffirm contract for necessaries. (1) A minor may not disaffirm a contract, otherwise valid, to pay the reasonable value of things necessary to support the minor or the minor's family that was entered into by the minor when not under the care of a parent or guardian able to provide for the minor or the minor's family.
(2) For the purposes of this section, the phrase "necessary to support the minor or the minor's family" includes housing.