We did this same loop over three weeks from Northeast Indiana, except that we put the Tetons first (3 days, 4 nights), followed by Yellowstone (5 days, 5 nights), and then the Black Hills (4 days, 5 nights) on the way back. Went out by way of I80 and back by way of I90. Made for an efficient loop. But I gotta tell you, unless you're a real fan of long days driving, that's a chunk of real estate to cover in two weeks. I'd really suggest you drop the Black Hills this time around and focus your trip this time on the Tetons and Yellowstone. In any case, you'll have a great time in a really great part of the country!
