QuestionsHow to growVegetable GrowingPotatoesresent cold snap on potatoes 0 Vote Up Vote Down Dermot Hayes asked 15 years ago hi gerry 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Potatoes are damaged by frost but they are not above ground yet and quite safe, the frost not being hard enough to penetrate the soil. Onions are hardy, not affected, unless very severe.