When I lived in New York (Zone 6), I waited until after the first frost killed the leaves, cut them or pulled them off (usually they were like mush). Then I dug the bulbs up, removed any smaller bulbs, Left them in the garage a few days to dry completely (longer if needed). Then I wrapped them in News paper and placed them in a brown paper bag until spring. After Last frost (usually after Mothers day) I replanted them.
"I read a book about Stockholm Syndrome.
At first I hated it, but by the end I loved it."
"If not for mans ability to Mimic, most humans would probably still be living in caves, grunting at each other."