From the East 1. From Cody, Wyoming take Highway 20 West to the East Entrance of Yellowstone. Cody Murals Visitor Center Cody Nite Rodeo 3. I - 90, just 243 miles east of Yellowstone and 180 miles east of Cody. There are some great areas to see near Buffalo, the Petrified Forest and Fort Phil Kearny on the Bozeman Trail and more.
Buffalo is a great hub location for touring Wyoming, Montana and South Dakota.
Yellowstone East Entrance - 243 miles From the West 1. From the northwest take I-90 East and follow the directions from the North. East to I-15 North and then follows the directions from the South. The entrances are open 24 hours 7 days a week during the normal tourist season - mid Apr to the beginning of Nov. You do not need reservations to enter the park.