Can I Have Out Of State Car Insurance In Montana? 
When you move to Montana and register your car in the state then you have to switch your insurance to Montana . If your car is still registered in another state then you can keep that insurance providing it has the same limits or higher Montanan liability limits for minimum are 25,000 / 50,000 / 10,000 But If you have moved to Montana then you need to register your car in Montana you have I believe 30 days to register your car in the state once you have moved here . 