i would not try the MSP on any kind of snow at all. Part of the speed rating of a tire is how stiff the sidewalls are and tire compound. a Z rated tire will get VERY hard in colder climates (generally under 40 degrees) and will feel like an ice skate. Instead of kicking it's heels in to stop the car, it'll just drag and skid. The tires on the MSP are about as performance as they come while still being dot legal. IMO if u get any kind of snow regularly, it'd be wise to purchase a set of snow tires