I don't know if I can find it now, but there was an article by a Pennsylvania master gardener who wrote about fall-planting potatoes for next year's early new potato harvest to coincide with green pea harvest. I posted the link here a long time ago.
Vaguely remembered technique was to plant in a raised mound to avoid winter water logging and mulch really well 8-10" if I remember. It's ok for the tops to get frosted and die -- or maybe they were pruned down to be covered with the mulch. So even if they are not ready, you may be able to get them to survive the winter?