Jackson Hole Airport is a 9-mile drive to the Grand Teton Park entrance in Moose, Wyoming, and 49 miles to the south entrance of Yellowstone. Yellowstone is one place equally liked by travel enthusiasts, family with kids, photographers, hikers and wildlife lovers. Grand Teton National Park sits near the Yellowstone supervolcano, which last erupted 630,000 years ago and ejected 240 cubic miles of rock, ash and volcanic dust into the sky and left a … Yellowstone Trails Grand Teton National Park (Image: GETTY) If the Wyoming volcano were to erupt an estimated 87,000 people would be killed immediately and two-thirds of the USA would immediately be made uninhabitable. Our plan to take a road trip to Yellowstone had been long pending since we had not driven for 12 hours with the 4 year old twins before.