For actual "mountain deer" (what I would define as deer that never set foot in a farmed field), you will find they are pretty spread out on the NF/State lands.
Also, once deer get out of the neighborhoods and 10-acre "ranches" the predators are pretty populous. They have to dodge a lot of lions and wolves to get very old. For example, NW MT is the only place I've seen mule deer does IMMEDIATELY run at the sight of a human. Spooky, spooky animals.
That is my long-winded way of saying September and October are going to be tough months for a bow hunter in the mountains.
I hunted the rut, never with a bow, but a rifle instead. I don't think that would change my tactics too much, though. Start by walking gated logging roads and looking for sign. FRESH clear-cuts are $$$ because they like to eat fresh pine branches out of the slash piles. Just like with any whitetail, there are certain places they habitually cross. My uncle used to shoot a buck almost every year with his rifle by sitting and watching a particular bend on a gated logging road.
Tree stand or ground blind is your preference. The toughest part will be the low population densities. (Its difficult to know if you're doing it "right" when there's hardly enough deer around to give you any feedback on your tactics. You'll start second-guessing yourself and want to move spots.)
Rattling does work when the rut rolls around, IME.
Best of luck.