That is the question–sorry, Hamlet. And White Flower Farm has some help with the answer: an article on Plants Slow to Break Dormancy. They have a lot of other articles in the Newsletter section of their Garden Help.
When dealing with frost it is always best to be paranoid. In the spring never think it is too late for one more frost to come. And in the fall never think it too early.
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I have had many a pleasant surprise by leaving my itchy fingers from digging out a plant that I was certain had not over-wintered successfully.
What I try and do is remember which plants are late in coming up and mark them!
Kathy: This comment has no bearing whatsoever on your post, but I wasn’t sure where else to comment. Imagine my surprise when I finally got around to reading my March Northern Gardener magazine and saw you and your blog featured. Very cool!