another crocus question

updated sat 3 jun 06

Melody on sat 3 jun 06

I have Fall crocus-- leaves in spring which die off about the end of June, blossoms in fall. They desperately need digging and dividing--but when? If I replant when the leaves die down, will they still bloom this fall? Or if I wait and move them after they bloom,.which is sometimes well into frost season here, will they be able to establish themselves well enough during our Zone 5 winter to put out leaves in Spring to gather energy for next year's blooms?
Melody