Mont. Code § 76-13-406
The department and other recognized fire protection agencies, including any agency of the United States, with which the department has entered into an agreement for fire hazard reduction or management as provided in 76-13-405 and any officer, official, or employee of the department or other recognized fire protection agency is not liable for any damage to the land, product, improvement, or other things of value upon the lands on which the fire hazards are being managed or reduced in accordance with provisions of this part, the rules adopted under 76-13-403, and the fire hazard reduction agreement when reasonable care and caution has been used and the work is being or has been performed in compliance with the rules provided in 76-13-403.
§ 76-13-406, MCA