Turquoise Pool

Turquoise Pool is a hot spring in Midway Geyser Basin that displays vividly colored mineral-rich water as part of Yellowstone's extensive geothermal system. The pool's striking appearance comes from its warm temperature and the dissolved minerals suspended in the water.

Members of the Hayden Geological Survey named and documented this feature during their 1878 expedition, which systematically mapped thermal features across Yellowstone. This early scientific work established how the geothermal landscape was understood and studied.

The thermal waters here held spiritual and healing significance for indigenous peoples of the region long before the area became a national park.

Access to the pool is via marked boardwalks that keep visitors at a safe distance from the hot water and thermal features. Stay on the designated paths at all times to protect both yourself and the fragile geothermal ecosystem.

The water color shifts throughout the year as temperature changes alter which heat-loving bacteria thrive in the pool. These seasonal color changes offer visitors a chance to observe how living organisms shape the appearance of geothermal features.