The Going to the Sun road is not very often open before July 1, and as pointed out previously, can be well into July before it is open. Keep in mind that there is an excellent shuttle service operated from July 1 until Sept.1 and it is free. This means that you can leave the driving to someone else, and enjoy the stunning scenery. You can get out at any of the stops to spend some time, then pick up another shuttle later. Our experience is that parking at most of the parking areas for scenic views is at a premium. You may find that you will have to drive right through without getting out of the car because of the lack of parking. Unless things have changed from two years ago, you can catch the shuttle on either the east or west side. The east shuttle goes to the top where you would switch to the west side system. There is also a change-over point at Avalanche before getting to the west side at Apgar.