Now. It's probably just starting to put out new growth. If you move it now, it will stunt it's growth, but only the part you can see. There should still be time to get it settled before the heat of summer sets in. If you don't want to chance it, move it in the fall after the first hard frost.
When you dig it, try not to disturb the roots if possible. Water the ground really well before you dig it out. And water really really well after you transplant it. Give it a good deep soaking every few days if the soil feels dry about 2" down. Use a wooden dowel or your finger to check the moisture.
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