As of 8am this morn­ing, Yel­low­stone closed its inte­rior park roads to start work­ing on win­ter activ­i­ties. The North Entrance road to Upper Mam­moth Ter­race and Mam­moth, to Tower Junc­tion, and to the North­east Entrance remains open to wheeled vehi­cles year-round. The North Entrance road to Upper Mam­moth Ter­race and Mam­moth, to Tower Junc­tion, and to the North­east Entrance remains open to wheeled vehi­cles year-round. The gift shop is always open with the excep­tion of Sun­days and Holidays.