So that???s basically it ??? chocolate cake that is about 55 degrees and you???re good to go with lettuce, carrots, radish, peas (all kinds), spinach, broccoli, onions and any other seed whose packet lists ???as soon as the soil can be worked??? or ???early spring??? as the planting time.If we get a forecast for a serious frost and freezing temps overnight, I sometimes cover my rows with plastic.