[giantg2]

True, but the second half of the sentence was that it was true for everywhere with winter weather. I was just pointing out that it isn't necessarily the case.

Edit: and also, some areas are not using salt for environmental reasons, like Portland.

[zdragnar]

Yeah, outer portions of Minnesota avoid using salt near wetlands as well- most states do, I think. You have to get pretty far into northern latitudes before salt stops working well enough to abandon it, though. Mixing sand or grit helps warm it up in direct sunlight enough that it can still be beneficial below zero F.