Montana Title 45. Crimes § 45-6-102. Negligent arson

(1) A person commits the offense of negligent arson if the person purposely or knowingly starts a fire or causes an explosion, whether on the person's own property or property of another, and thereby negligently:

(2) A person convicted of the offense of negligent arson shall be fined not to exceed $500 or be imprisoned in the county jail for any term not to exceed 6 months, or both. If the offender places another person in danger of death or bodily injury, the offender shall be fined not to exceed $50,000 or be imprisoned in the state prison for any term not to exceed 10 years, or both.