My Daphne 'Carol Mackie' is not evergreen; it loses its leaves each fall. New leaves emerge the following spring when temperatures begin to warm up. It's beginning to bloom now where I am.

Daphne may be evergreen in warmer climates but not in Z6a.

I purchased my shrub from Bluestone Perennials in 2010 and planted it in part sun on a slope north side of my house based on planting recommendations from the nursery. My soil leans toward acid.

I think D. 'Summer Ice' will be fairly evergreen for you since it sometimes is for me, though sometimes it loses most of its leaves.