While digging them is best done in fall, I wouldn't recommend replanting them in fall. I think your best bet would be to store them over winter in a dry spot and replant in spring. The reason I'd do it that way is because it seems winter hardiness is diminished when marginally hardy bulbs are planted in fall and haven't had time to root and establish before cold weather sets in. I planted some Crocosmia from pots in late summer one time and they didn't return the next spring. That may have had something to do with them being in airy, porous potting media that allowed too much cold air around the corms.
