When is best time to divide irises?

When is the best time to dig and divide irises? Thank you.

about 6 weeks after bloom

Thank you irisMA.

Your avatar is a beautiful iris!

It is a miniature tall bearded iris.

what is the name of the iris you have picured on the top, first one. Kim

The first one top row is "Mikey Likes It".

It is a SDB (standard dwarf iris).

That is correct

Thanks kim

I have some that have been dug at different stages this year that have yet to be planted. So I guess this will be an experiment in how late can iris be planted and survive in zone 4B? I once used some fluffy wood shaving packing material ( excelsior?) around late planted special ones, and topped with a large plastic planter once it started to get cold. They did ok as I remember.

freezing doesn't seem to hurt the rhizomes, but it will "heave" them out of the ground if they are not "rooted in" yet. Just set a brick, or rock of them, and take it off in early spring. They'll be fine....Arlyn

Thanks for the advice, Arlyn

The best time to plant rhizomes is in July, August or September. This is also best time to divide and replant irises that have become overcrowded. Plants are normally dormant during the heat of July and August. Be sure to plant at least 4 to 6 weeks before your first hard freeze or killing frost. If roots are established before the end of the growing season, they should survive freezing weather. It's always good to mulch them with a good hardwood, cedar, or whatever type of mulch.

I'm in Zone 8 but I think this advice applies across the board.

Rockette, I love your pictures!