Definitely not just yet.
I hold off until April. Just remember that summer tires won't have good adhesion to the road until they are warm. Since the outside temperature will be in the single digits, a summer tire compound ends up being a hockey puck when cold and becomes nice after a good steady drive or warm pavement.
I'll be glad to whip the Kumhos on again. My winters have had it. They are beginning to show their wear after close to 60,000 kms on them.
