am in colorado too...i run all weather tires all year. the nokians wear fast will see how the crossclimate 2 is this winter.I just got my second set of Nokian WRG4 all-weather tires. They have been excellent in the now. only downside is rapid wear. They lasted 17K miles. My previous Michelin MXM4 and A/Ss3+ lasted between 25-30K miles (but weren't as good in winter).