Mount Phillips is a 9,498-foot mountain in Glacier National Park’s Lewis Range in Montana, with Lupfer Glacier on its east slope in one of the park’s heavily glaciated alpine areas. Like many peaks in Glacier, it is made of sedimentary rock laid down in ancient shallow seas from the Precambrian through the Jurassic. Its present form reflects the Lewis Overthrust, which began about 170 million years ago and pushed a vast mass of older Precambrian rock over younger Cretaceous rock. The mountain lies in an alpine subarctic climate with long, snowy winters, short cool-to-warm summers, and severe cold that helps shape the peak and glacier.