It Ain't Pretty
But it's necessary!
I have four very large ceramic planting containers. They have to be protected from freezing and thawing through the winter to prevent cracking. Once upon a time I was able to lift and maneuver them around. And now my two newer ones are even bigger than the first two, so moving them into a protected garage is no longer possible. Not to mention limited space in the garage!
So, I let them dry out COMPLETELY and just cover them with a sturdy yard waste bag. It is so important that the soil be dry. It doesn't take much water to freeze and expand to crack the ceramic.
Now I just hope for lots of snow to cover this monstrosity.