Montana law requires Bodily Injury Liability coverage of $25,000 per person, $50,000 per occurrence and Property Damage Liability of $10,000.It does not require Uninsured Motorist (UM) coverage for drivers, though it does require all insurance companies writing policies in the state to offer it. It's probably a good idea to opt for it: A 2007 study says that as many as 15% of the state's drivers are uninsured. If you want more details on Montana auto insurance requirements, you should contact the Montana Commissioner of Securities and Insurance (http://sao.mt.gov/).