Fried doughnuts are da Bomb, but do not keep well without some tender loving care. First, you have to use lard to fry them in- lard gives them a crispier crust which doesn't sog as fast or easily. Second, you have to cool them rapidly so steam doesn't sog the crust. read more
So I decided to do some research on How To Keep Your Doughnuts Fresher, Longer! Store Doughnuts in Ziploc Storage Bags or air-tight containers This tip is good if you do, indeed, plan on eating the doughnuts the next morning (and the box has been opened). read more