all depends on weather the snow can be pretty heavy in certain areas in the park
The Going to the Sun highway usually closes around mid October. We were there in late October and were able to go only a few miles until the road was closed.
They do have planned closures and also closures due to weather. I would check they're website to be safe. The only closures I've heard of were for weather and wild fires. Enjoy!
It is possible. That time of year is when the snow starts in Montana.
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