The photo you sent does not show the base of the tree, right at the soil level.  Such information would indicate if the tree was properly planted.  Perhaps it was planted while still in the plastic pot?  Planted without removing both the burlap bag and the wire basket?  Planted too deep, so you don't see the trunk flaring out?...

Does your tree have a strong central leader?  Is there one branch growing straight up from the trunk?  Is it still alive?  You could trim off the dry, brown, dead branches—about an inch or two at a time—so you could see this.  If you see no living central leader, your tree will never look right.  That’s the bad news.

Here is some good news for you.  The nursery that supplied your tree, Harmony Gardens, is thought to be a reputable company.  They may have a one-year guarantee on their plant stock, and will replace your partially-dead tree.  Perhaps you should call them soon? 

To select a new tree that CSU recommends for our area, refer to https://planttalk.colostate.edu/topics/trees-shrubs-vines/1715-selecting-trees/  You can visit a local nursery or the Colorado State University Arboretum in Fort Collins to see a tree species you will like in front of your new home. 

May you enjoy your new tree.