I don't think so....deep frost in the woods does hamper sap flow from maples. I have trees on a ridge and there is a north and a south to this ridge. The frost always goes deep on top of that ridge b/c the north wind blows the snow off every winter, so there is always frost up there most winters. This winter we had very little snow...an inch or two, and the frost has gone down 12-18" with the cold winter. My south trees ran pretty good on Wednesday, more than any day this year b/c there is some frost starting to come out there. I have not got enough off the north side to clear the lines yet. With that being said, the south ones have not run gang busters yet. I don't see any big runs for at least another week, maybe two. One old timer once told me, "the sap runs the best when you can't get to the trees." What do you think that means?