We are on the edge of zone 5 & 6 here in southwest PA and we never put tomatoes in till at least mid May.My friends in the north, when do you transplant your tomatoes? I'm in zone 5B in IL near Chicago. I'm thinking May 1st, but would love to do so sooner if possible. Is no frost good enough? Or do they really need temps consistently above 60F? And does that mean nighttime temps above 60F?