Bill, you can definitely put them in, but they likely won't look very good. The cold has been brutal along with the winds. If they are planted properly and mulched in, you should get a good show come spring.
If you are looking for some winter color for a good client, check out Hellebores. They are not at all cheap, but the show they put on in the winter is amazing. They are perennial and will continue to expand the clump year after year. They make an amazing winter ground cover. Depending on your climate, they may completely disappear in the heat of summer or just look very disheveled, but you can cut the evergreen foliage back.