Unfortunately, I don't have the luxury of putting mine inside, or even in a shelter (it's on the ever-lengthening "todo" list). If there's an attachment (most of the time) I make sure it's down, and the bucket gets lowered to the ground. I don't have to worry much about it freezing stuck here in NC. But we get plenty of rain - so I tilt the bucket so that the bottom is angled slightly downward, but the "lip" on the top (not sure what you call it) slopes to the rear, to avoid having it fill up with water.
I guess it's faded a bit, but the paint doesn't seem to have done that badly. The plastic is definitely taking a beating though.