Colorado doesn't have any dates you have to take them off.

I still have my Kumho's for the summer, then my uniroyals for the dirt and mud and these will be my winter going to the ski slopes and everyday snow driving tires. The lack of salt in the springs here leaves ice everywhere, and I need something for the ice.. I know ice is pretty much impossible.. but I just tap the gas here and can spin out really easy, not to mention the mountain driving in the snow and the uniroyals I'm using were excellent in Ohio... and they have tons of tread left, so I'll keep them for the summer trail. I will be mostly on the road for the winter here, I'm just not feeling comfortable with my current set up here.

I really like the studded tire idea, seems like people with rear wheel drive use them and do very well.. I can't imagine how nice with 4 and 4wheeldrive...