Tires and Minnesota’s prohibition on studs
Minnesota law makes this easy to get wrong. Statute 169.72 prohibits any block, stud, flange, cleat or spike projecting beyond the tread of a tire on a vehicle moved on a highway. Chains are the exception, allowed in reasonable proportions when required for safety because of snow or ice. A vehicle registered in a state that allows studs may run them while occasionally here, with limits on stud size and coverage, and more than 30 days in any six months is not occasional.
So the winter answer in Minnesota is a proper winter or all-weather tire rather than a studded one. The rest of the year, choose for gravel and mud rather than rock, and carry the means to fix a sidewall a long way from a shop.