The growing degree days on the phenology calendar (oardc.ohio-state.edu/gdd/) have accumulated somewhat but slowed down recently due to the cold weather. There is damage to buds that had started to develop by the first of March.  For example, look for crocuses  which have had their petals destroyed or badly damaged.  Snow is a blessing when cold air comes—it insulates the plants on the ground.  It is possible that buds of fruit trees and small fruit like currants which were warmed during February might suffer severe damage from the cold we have been experiencing this week. Time will tell. If you are interested in finding out sooner rather than later, you could cut open a bud and see if it is still green on the inside.  A brown interior is not good. Remember that we almost always have frosts and freezes in this part of Ohio until mid-May.