Mont. Code Ann. § 35-21-811

An action may not lie against any mausoleum-columbarium authority relating to the remains of a person that have been left in its possession for a period of 2 years unless a written contract has been entered into with the mausoleum-columbarium authority for care of the remains or unless permanent interment has been made. This section may not be construed as an extension of the existing statute prescribing the period within which an action based upon a tort must be commenced. A licensed mortician or funeral director is not liable in damages for any cremated human remains after the remains have been deposited with a mausoleum-columbarium authority in Montana.