There now is a fungus that infects Blue Spruce in Wisconsin - it thins the needles on branches. If you have one of those trees, and the tree seems less dense, your tree is infected. A slow killer so the tree will last for years before it succumbs.
Blue Spruce is native to Colorado.
There are plenty of trees that shouldn’t be planted outside of their native territory. Ash should be happy in NH.
I’m in NH, but shouldn’t plant boreal Black Spruce, which thrives quite well in next-door Maine...!