I was at Willsboro today. Some of them like Landot, Vignoles and Cayuga are from budbreak to 2 leaves. Most of the rest are at 3-6 leaves with Marquette farthest advanced, but Frontenac and Frontenac Gris are actually longer at about 6-8 inches. My furthest along are the Frontenac at about 7 leaves and 8-12 inches, but they also suffered the worst frost damage.
It was interesting at Willsboro in that there were actually a few frozen leaves at the highest part of the knoll even though the weather station reported 32 for a low and is only a hundred yards from those few frozen leaves. It was a glorious day with temps in the mid 70's and blue skies this afternoon after mixed clouds and sun this AM. I got the first spray of the season on them today.