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I have three of these and I think it will not be a good idea to leave them like that over winter. This is in Toronto Canada. Here is the hardiness map. I was thinking that storing them in a shed my work. How much light do they need?
Update: one year later
Not a bad winter all in all. at some point the planters where full of ice, the plants were covered in ice because the water did not drain (the bottom holes plugged) and it froze filling the planters up
We have a dozen of more of these planted with various succulents and experiments and we garden in zone 5a which is colder than your zone. Winter preparation is to move them to an area with good snow cover. Snow is an excellent insulator from the wild changes in temperature that seem to be the new norm.
Toronto weather tends to be moderated by the lake but this means your chief worry is the plants getting waterlogged then frozen.
I would move them to an area protected from winds, road salt and bright sun. An easterly or protected northern site should do.
Then, to protect against them getting too wet I would make a little tent to keep the rain/snow off. As long as it has ventilation it should not warm them up during the winter.
