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General advice is when daytime high temperature fall to mid-40s Fahrenheit, if you're running high-performance summer tires (as nearly all of us are). Secondary factor is probability of freezing precipitation.
So .. for me that means winter tires are mounted November through April. Around here I'm not alone; tire stores are overwhelmed for a couple weeks this month, then again in April/May, as everyone changes over from one season to the other.
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