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I would probably wait until spring just to be safe--plants that have just been planted and haven't gotten established yet often tend to be a little more susceptible to cold damage. I do the vast majority of my planting in the fall, but when I'm planting things that are going to be borderline on hardiness I'll usually save those until spring just to be safe.
I would wait till spring, say maybe end March onwards, this way you will protect the tuber from cold night temps and also less chance of rot setting into the tuber IF there is a lot of rainfall compared to summer time. good luck, WeeNel.