We passed these last two days in Yellowstone National Park, which is mostly in Wyoming.
From our base in Gardiner, Montana, we drove the one open road, which is in the northern section.
This road is kept open in the winter because it is the only access for the residents of Cooke City, which is just outside the north east entrance to the park. Its other access is over the Beartooth Pass, which at 13000 feet is closed all winter.
The temperatures on these two days varied between -24 and -31C.
Here is a selection of images from our time in the park.
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On one of these days we drove to Cooke City, which is in Montana, for coffee.
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The coffee and the lunch were very good - worth the extra miles.
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This is the Yellowstone River in Paradise Valley, the route from Livingston, on I-90, to Gardiner, the park's north west entrance.