Hey Ken, I've been planting my sprouted potatoes in the school garden since January. The kids think it is a small miracle (which it is!) that a hunk of a potato with an eye can make a whole new plant. You should see their eyes when we dig up the new potatoes, too. Last fall we grew purple ones.
They are fine with a little light frost (we did have one night) until they start putting up leaves, then you'd have to cover them. Mine here at home are 8in. tall plants by now.
As they start to grow you'll want to 'hill' the soil up around the stems of the plants to encourage them to make more tubers.
