coreopsis limerock ruby overwintering?

With the discussion on coldframes, thought I'd check back on the topic of coreopsis Limerock Ruby - Did anyone have it overwinter successfully? Does anyone have ideas of how to overwinter it successfully? I'm noticing that various catalogs now have quite different opinions about suitable zones. I bought a plant this spring and it is coming into full stride and I LOVE it! We generally have good snow cover and sandy, well-draining soil, but is that sufficient for zone 5, or...
(I know, early to talk overwintering)

Beth
zone 5 - northwest lower Michigan, near Traverse City

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