Question: what roads are open in yellowstone in april?
Answer: Conditions permitting, roads will open at 8 a.m. on the following dates. Open Year-round: Gardiner to Cooke City, Montana; Mammoth Hot Springs to the Upper Terraces; and Highway 191 between Bozeman and West Yellowstone, Montana. April 17: West Entrance to Madison, Mammoth to Old Faithful, Norris to Canyon.