Ticks have a natural antifreeze system that helps them survive cold — even severe cold — weather. "Ticks lying underneath the snow pack could be larvae, nymphs or adults,” said Dr. Stephen Rich, a microbiologist at the University of Massachusetts Amherst. “Adults will be active as soon as the snow melts and temps warm,” he said. “Nymphs will follow in late May/June.” (Cape Cod Times 1/13/18)