The single most common question travelers ask before a trip to Glacier National Park is whether Going-to-the-Sun Road will be open. This 50-mile engineering marvel crosses the Continental Divide at Logan Pass and is the only road that traverses the heart of the park. The catch: it spends most of the year buried under snow, and its full opening date shifts dramatically from year to year.
When does Going-to-the-Sun Road fully open?
There is no fixed date. The full road, all the way over Logan Pass, typically opens between mid-June and early July. In low-snow years it has opened as early as the first week of June; after heavy winters it has not opened until the second week of July. The historical average lands around late June. The lower sections at each end, from Apgar up to Lake McDonald Lodge on the west and from St. Mary to Rising Sun on the east, open much earlier in spring and stay accessible.
Why the opening date changes so much
The reason is the plowing operation, one of the most dramatic in the National Park System. Crews start clearing the road in early April, working from both ends toward Logan Pass. Near the Big Drift just east of the pass, snow can pile up to 80 feet deep. Avalanche danger, weather, and equipment all factor in, so the Park Service never promises a date. They announce the full opening only once crews break through and safety work is complete.
How to check the current road status
Before and during your trip, rely on official sources rather than guesswork:
- The park's road status page updates the exact point vehicles can reach on both the west and east sides.
- Plowing progress updates are posted in spring with photos showing how far crews have gotten.
- Webcams at Lake McDonald and St. Mary give a real-time look at conditions.
Bookmark these before you leave, since cell service inside the park is spotty.
The vehicle reservation system
Even after the road opens, you may need a timed-entry vehicle reservation to drive the Going-to-the-Sun corridor during peak summer hours. These are released in advance on Recreation.gov plus a smaller batch the day before. Entering before the early-morning window or after the evening window lets you skip the reservation, which is a great strategy for sunrise drives and beating crowds at Logan Pass.
What to do if the road is still closed
If you visit before the full opening, you can still have an incredible trip. The lower road is open to Avalanche Creek on the west side, giving access to Trail of the Cedars and Avalanche Lake. On the east, you can reach Rising Sun on St. Mary Lake. The quieter Two Medicine and Many Glacier valleys have their own entrance roads that open independently of the main road, and early season means roaring waterfalls, thin crowds, and abundant wildlife. Cyclists also love the window before cars are allowed over the pass, when the upper road is plowed but still closed to vehicles.
Planning around the opening date
If driving over Logan Pass is the centerpiece of your trip, aim for early July to be safe, and keep your plans flexible. If you are coming earlier, embrace the shoulder season instead of fighting it. Our Glacier National Park Memorial Day weekend itinerary is built entirely around what is open in late May, when Going-to-the-Sun Road is still partly closed, so you get the best of the park without disappointment.
