According to YNP, all roads within the park are open for the summer season.

Open roads are not gated at night: people may enter/exit the park 24 hours a day, seven days a week.

You can check webcams to see current traffic conditions at the North and West entrances.

Also, The Beartooth Highway should be open for the season very soon. Early season conditions exist. PLEASE ALWAYS CHECK CURRENT CONDITIONS –

For more information on Yellowstone National Park, click here.