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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.
Iris should be divided in the late summer after they have stored energy in their rhizomes all summer. If you wait too long into the fall to replant the rhizomes, the roots may not have enough time to establish before the ground freezes and the plants will be subject to frost heaving.