Montana Supreme Court Cases (State L. Libr. Mont.), coverage from 1980 to present. Includes: Opinions issued by the Montana Supreme Court, Selected Orders of the Montana Supreme Court (including Orders affecting the rules of practice and procedure), Special Writs issued by the Montana Supreme Court, Briefs filed by the parties in the above cases and recently filed briefs.
Try searching for dockets on the court's web site. The National Center for State Courts offers judicial branch links for each state, focusing on the administrative office of the courts, the court of last resort, any intermediate appellate courts, and each trial court level.