If I were you I would pot them up and put them in the Fridge or cool and DARK area where temps are between 32.F and 40.F. this should get them to form somewhat of a root system before the ground thaws. I would get them in the fridge of cool Dark are right away. and I would let be cool and dark at least for all of March. then you can plant them outside. don't forget to keep the moist to help form roots. If you wait until spring to plant them outside without giving them a cool treatment it might mess up there growing season. I have King alfred daffodils and tulips in the fridge right now and it only took about a month to form little roots. hope this helps you.