Just a quick post to note we did get a frost here in southern New Hampshire this morning. May 15th is about the latest I remember off hand, although the old-timers would never bother plant anything but peas until Memorial Day, likely for just this reason.
Hopefully the frost was only at ground level, and not bad up in the blossoms of the apple trees. The core of the cold air had actually passed, however conditions were perfect for frost. Clear, with the wind dieing to a calm.