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Well, it was -1F/-18C here last night. The ground is frozen, pond is frozen over, the duck is moved in with the chickens, a water heater was installed for the chickens, and I can't dig up potatoes any further. I have plenty of potatoes already dug up, to eat on, until the ground thaws out in spring. It has been a full month since I've opened the trashcan cellar to check on the potatoes. Here's the results. The top layer of potatoes seem normal. They don't have any sprouts and they are not spongy. It was down to 32F/0C in my garage, so I decided to move the rest of the seed potatoes into the trashcan cellar. I also chucked in the thermometer, the temps on which right now don't show the actual temps since it just came from the garage.
All-in-all, the trashcan cellar seems to work, but I'll not know until I empty it completely next spring. Hopefully, the temps at the bottom will be low enough that the potatoes there won't sprout further.