Over Wintering Potted Trees

[Rockford]

I have a few Red Oaks, Bur Oaks, and Walnuts potted. I live in Iowa and I know trees in pots wont normally make it through winter around here without some special attention.
Will healing them in with mulch or wood chips work? Or is there a better way?

 

[pdqdl]

All the nurseries cover the root balls with mulch. You should be fine doing the same.

Don't forget to water them. Trees need water in the winter, too.