"These seeds"?? :haha: Most seeds are not harmed, even if the top layer of ground freezes, if they have not sprouted. Some things are more tender than others. If your soil is really wet and heavy, the seeds could likely rot before they germinate. (that's what happens to me if I plant too early) In my annual flower garden many seeds over-winter in the ground and sprout in the spring and they same thing happens in some areas of my veggie garden.