Frost on a Japanese Maple

A friend and I were discussing how nice the weather had been and the planting of summer crops. I was telling her how bummed I was that I had not been able to plant anything. On the beach I would have already planted my tomatoes. In Currituck the farmers would have already planted sweet corn, so that it is ready for the 4^th of July. I wanted to plant something. Things are different here she informed me, she said that she never planted any summer plants until after her 20^th of May, when I asked her why she said because that is when the risk of frost is over. Early this morning, on the 19^th of May we had frost. You see my friend is a master gardener so I guess I should listen to the master gardener, I might learn something.