Hi Greg
I follow Trees of Joy website advice for protection, tie up tree with string, then wrap around tree with pink fiberglass insulation all around the tree and tie that up, finally wrap and tie up some blue tarp around the tree, cover the base under the tarp with lots of leaves, and you should be good to go. After about 4 years the tree should be able to withstand a cold winter, depending on branch and trunk thickness. Prune back any thin tips regularly after that. Good luck!