I see the label says "Sub Zero Roses." If that's correct, then the rose photographed was one bred by Dr Brownell who lived in New England and bred roses specifically to survive NE winters. It sould do pretty well, even with nippy weather.
I must agree with Lynn, Sue, porkpal, and Cindi, I'd put them in the ground as soon as the soil can be worked. When it comes to getting new roses through spring Cindy, IMO, works with some of the most brutal rose growing conditions of us all, so on this question I'd pay special attention to her advice.
If you are still worried about late freezes, mound up some mulch, then pull it back in late April or whenever statistics and a 10 day forecast suggest no imminent frost. Do water them carefully in any week when you don't have rain until they are well established in late summer.
