Mount Pluto is an extinct volcano in the Granite Chief Range near Lake Tahoe, California. Formed by eruptions about 2 million years ago, the mountain rises to 8,617 feet and played a direct role in shaping the Tahoe basin when its lava and mudflows dammed Lake Tahoe. Its significance lies both in its volcanic origins and in its connection to the region’s geological history. In the present day, part of the peak is occupied by the Northstar California ski resort, giving the mountain both geological importance and a modern recreational use.