I believe April 15 is the average date of last frost for your area. There's a world of difference between "average date" and "safe". Mother Nature is just reminding us what the word "average" means.
For us here in MN, it's cold this morning (34) but that's not far from our average. Problem is, we had an extremely warm April this year, so we're spoiled. Yesterday the temps were in the 50s with a brisk north wind, which is actually what we should expect this time of year, and I found it so uncomfortable that I stayed indoors. Only a few weeks ago it would have felt great.
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