Answer: Put a thick layer of mulch around the root systems to help protect them. You could also loosely wrap the trunks with burlap and that can remain on through the winter. If you try to cover the entire tree, it should be supported on some type of framework so the coverings are aren't touching the foliage--freeze damage can actually be worse. Covering should be removed during the day because temperatures can heat up underneath when the sun hits, and the slightly warmer temperatures can cause the tree to break dormancy, increasing the likelihood of freeze damage. If there is some way you could create a windbreak for them, that would be helpful. That's a tough situation--I hope this info helps.
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