Im hoping to be in Yellowstone next May (around the 20th) for 3 nights as part of a round trip from Denver via Grand Teton NP heading back via Cody, Sheridan, Rapid City, Wall, Badlands NP. And hopefully taking in most of the sights along the way.
My question is regarding the Road conditions in Yellowstone at that time of year, If there is heavy snow do the major routes become impassable or are they ploughed regularily? Im from Ireland and we usually dont have very heavy snow such that the roads would be closed. Im worried about getting stuck in Yellowstone and missing out on parts of the rest of the trip.