I'm a couple hours south of Rally and I did mine a week into May. Several trees were in full bloom that I cut off to graft. Bark slipped so easily I thought I was doing something wrong and had nearly 100% survival. Some of my scions grew 8 feet and are the size of my thumb. I believe you might be in OH? I would wait another 2 weeks minimum. I will be back in MI around May 15 to do some more this year.