I planted my seed potatoes in March in containers and put them outside. We had cold days and even snow once.
Will my seed potatoes still be able to produce potatoes?
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Unless your containers are very small and the cold was very deep, there is a good chance that the potatoes will be fine. It takes a lot of cold to freeze a container entirely, and even then the potatoes are exothermic - the heat on the inside of the mass of the tuber will protect the surface where the eyes are from freezing. I'd say at least 98% chance that a tuber that was healthy when planted will survive just fine.