Around south-central Kansas, everywhere you look, you can find windbreaks of Osage Orange, where settlers dug a shallow trench, soaked the fruit in a bucket of water, then dumped it in the trench. These would grow up tight and tangled, later to be thinned, or used as fence posts, or left to work it out for themselves.
It is my understanding that species of will can be planted that will be amenable to layering - meaning you can get a tree established every 8 feet or so, then bend a limb down and bury it under the ground to sprout up all along the gaps. These can be woven together, or left go thick and feral.
I am uncertain what species and methods may be traditional/suitable in Montana.
The "Artsy" Track: A new craft everyday! Making natural paints, doing cob work with glass bottles, felted community art, wood-burned public art installations, beginner's wood sculpting, beginner's welding