The lower elevation sections of the Going-to-the-Sun Road are open year-round, but due to the high elevation and challenging weather conditions, parts of the road are closed during the winter months. The road usually opens for vehicle travel around late June or early July and remains open until mid to late October, depending on weather conditions and snowfall. These dates can vary from year to year, so it's advisable to check the current status of the road with Glacier National Park authorities before planning a trip.