My understanding is that potatoes are not really "frost proof". Old timers around here said to plant out when the dogwood trees are blooming. Of course the dogwoods generally bloom before we have our last frosts. So last year, I didn't want to buy my seed potatoes to far in advance since I really don't have a good cool dark place to store them. Big mistake, by late April, every place around here were sold out and I couldn't find any other than $5 a pound ripoff's on line and I certainty could buy potatoes during the winter much cheaper. This year, I bought them as soon as they were available and was able to store them at one of my relatives basement.
