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The best time to move iris is six to eight weeks after they bloom. Division and transplanting can be done at the same time. I would try to flag them now with some type of marking system while in bloom so that you know what you are moving later.
The iris flower bulbs should be dug from the bed just before the first frosts and then left to dry for a few days in a frost free location. Once the bulbs are dry, any remaining leaves and excess soil can be removed and they are then ready to be taken to their winter storage quarters.