Listen to Bryan; he knows from whence he speaks. Since you are not part of Club TC, I would counsel having all-wheel drive and M&S rated tires in good condition. Cool and snowy comes early to that part of the country and you don't want to get caught with your proverbial pants down. I've been there in June when it was cold and inclement. The times you are contemplating could be magical for pix. The date is October 6th. The location: our campsite, east side, Sierra Nevadas, a lot further south and west of the Tetons. Jeanie is turning on the propane: Not a good day for picture taking. It got down into the teens overnight. You just never know.

regards, as always, jefe