Are these bare root trees? Are the trees fully dormant and hardened off?
If they are bare root trees, I would try to get them in the ground as soon as you can. I don't like to leave trees in pots over winter if I can help it. With that said, if they are already in containers, you might have better luck with winter survival keeping them in the pots in a protected environment. I would be curious to hear how others feel about that.
Be sure to water the trees after you plant. Make sure that the soil is firm around the roots before watering. The goal with this water is to just make sure the roots don't dry out over winter and that you are removing any air pockets around the roots.
This isn't an ideal time to be planting trees from my experience, but it can work.