@touchofsky, I've just noticed your question. This is what I would do.
If possible, prepare that new bed in advance. That is, the moment you dig up your old peonies, plant some of the divisions into the new bed. I said divisions because it is unlikely that you would be able to dig up all roots at once. They will probably break into several divisions. Those that are left; that is, those that are supposed to go to the old bed, can be kept in shade for a couple of days. Nothing will happen to them for a couple of days, especially if you water them. Good luck
