Home Events - Cody Calendar The east entrance to Yellowstone opens Location Yellowstone National Park Category Family FunGovernment More Info Read More Date May 07 2021 Expired! Time 8:00 am The east entrance to Yellowstone opens The east entrance to Yellowstone opens up this morning! Let the summer season begin! Cody Calendar advertisers make this calendar possible. + Add to Google Calendar + iCal / Outlook export The event is finished.