At least with the '07, the OEM wipers didn't fare well with the salt. If they use sand out your way, you'll probably be fine. Here in Toronto though, and through Quebec, they use salt. We didn't replace ours ahead of time, but looking back I wish I had. Just watch the sizes, specially when you install in on the passenger side. There isn't a lot of clearance with the suggested size. Try 'em on before leaving in case you want to get a size smaller.
We don't have the rockies, obviously, but New Brunswick can be pretty hilly at times. You're getting winter tires, which I would have recommended otherwise. We never had any trouble, just be ready to shift down/sooner if you've got a MT, though that's pretty obvious.
More generally speaking, keep some windex and paper towels in the car. The salt can really make the mirrors hard to see out of.
Have fun!!
Digi