Hi Jennie,
I live in Texas 7b, and from my experiences, I would wait a little until we are further into fall. I have found that the double stress of moving and heat/humidity really will take a toll on your daylilies. Last year I planted a bunch in fall (Last week Sept., first week Oct) and they did great. Better, in fact, than those that got spring planted. So I think you're safe waiting a while. We have been relatively lucky, with temps in the low 90's here... but at any moment (as you know, I'm sure) it could go back to the 100's. I am getting a Maryott's shipment sent on 9/22, so we are probably going to be planting the same week!! :O)