Here are a couple risks I can think of when planting in places colder than me at this time of the year.
Most likely it will get cold again and snow again-----
If not protected, leaves them vulnerable to being chewed up by vermin before they even have a chance to grow.
Also if it warm enough, they may start growing, then the cold hits and kills of all their new lush growth and doesn't have the energy to survive.
If you paid for them, then wait, if not, then can try and see. I've planted cuttings in about every month.