Here is a blurb from a site on daylilies. I guess the answer to your question is no you can't grow them where they get hard frost, because even if you get a hardy evergreen one the foliage will die back anyway

Daylilies are registered as one of three categories: Dormant, Semi-Evergreen and Evergreen.

Dormant - the foliage dies back in the fall and grows back in the spring
Semi-Evergreen - are somewhat in between the dormant and evergreen varieties
Evergreen - will try to keep their foliage during the winter

In our Canadian climate all foliage will eventually die back after a hard frost.
Generally, although not always the case dormants are supposed to be the most hardy, evergreen the most tender and semi-evergreen in between. However, there are tender dormants, and very hardy evergreen and semi-evergreen. Therefore, foliage is not always a good indicator of hardiness.

Well, so far all my daylilies have returned. Some are dormanent, evergreen and semi-evergreen. The ones that had the most snow cover did retain some green over winter. That's amazing considering how cold it was on the praires this last winter...or has it ended!

Jetred in Winnipeg