go ahead and do it but wait until fall to put them in the ground..
i have lived in zone 4/5 my entire life and I always have
volunteer potatoes that grow from those missed when we harvest in the fall..the got moved around but never pulled out of the ground..the strays with the harvest
i have also had potatoes grow from those thrown in the
compost pile..generally..these are the best potatoes that you would ever get..seriously
so give it a try, it certainly can't hurt..and while you are at it throw out a lot of other seeds, like peas, lettuce and other greens, coles (those that are frost tolerant) , perennials and some herbs, frost tolerant types..
you
should have a nice early garden..but remember to wait to do it really late in the fall..you don't want things to start growing TOO early and just get killed off by the freezing and lose it all.
i have done a lot of reading on fall planting and it only makes sense.
also when you harvest..leave the stumps in the ground of a lot of your plants..i have cabbage ready to pick from last years stumps, and i ate swiss chard all summer from last years stumps..so you gotta plan ahead when you live in our cold areas and also remember..self seeding !!!