According to Glacier Park’s road status page, Going-to-the-Sun Road is now open to general traffic as far as Avalanche Campground on the west side and to Rising Sun from the east.
Here’s the official write-up:
Currently 21.0 miles of the Going-to-the-Sun Road are open for travel.
Visitors can drive 15.5 miles from the West Entrance to Avalanche, and 5.5 miles from the St. Mary Entrance to Rising Sun.
The section of the road between Avalanche and Rising Sun is closed due to plowing. On the West Side, Hiker/Biker access is to Packers Roost, approximately 6 miles from the Avalanche Gate – while the road crew is working. On the weekends, there are no restrictions. On the East Side Hiker/Biker access is to Jackson Glacier Overlook, approximately 8 miles from the Rising Sun Gate – while the road crew is working. On the weekends there are no restrictions.