Dress warmly! At that altitude, snow is a real possibility in September. We visited during July many years ago and it snowed the night before we got there. My in-laws used to have a cabin in the mountains not far from there and they had to vacate it each year by early September because the road they lived off of was normally covered by snow then and was not cleared by the highway department. Still, I would imagine that Yellowstone is gorgeous in the late fall and/or early winter. Enjoy!
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