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					Originally Posted by mountainman  I have not tried them, but a frient has the michelin all seasons on his boxster S and loves them.  He is also a very aggressive driver.  I personally have  multiple sets of rims and run bridgestone blizzaks in the winter. | 
	
 
I drive my Boxster base in winter in the snow and run the blizzaks in winter with no problem. I dont know about Colorado but snow tires in winter on a Boxster in Canada are highly recommended. I do not know about all season tires but I will drive in snow about 3 inches or less with winter tires.