Siberian Iris

Is it too late to split up and/or move Siberian Iris? The leaves are just starting to go yellow at the tips. Or, can I move successfully in the spring before they kick back in to life. This would be better as I can do it at the same time I plan to move other things around the garden.

You should be fine in spring - in fact, it's so tough that I move it around at any time.