Sunset Lake
Turquoise geothermal pool steaming softly, mineral-crusted rim, pine forest and hills in Yellowstone National Park.
Steam rises from a rainbow-colored geothermal pool with orange-brown crust, under a blue sky over Yellowstone National Park.
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Sunset Lake

Natural Attr★★★★☆
Last Updated: January 2026

Overview

About This Attraction

Steam drifts above a deep blue pool framed by a wooden boardwalk. A bright ring of yellow and orange thermophiles marks the margin while mineral-scented air hangs heavy. This is a hydrothermal bed in Yellowstone, where superheated water cycles through the crust powered by the volcanic heat beneath. For millions of years, the Yellowstone Caldera has hosted this circulating system, its heat source lying beneath the surface.

Best Time to Visit

Summer and early fall; roads are open and crowds are manageable. Aim for late afternoon when light angles across the steam for richer color and reflections.

Visitor Tips

  • Look for the deep blue center and the yellow/orange rims created by thermophiles.
  • Stay on the boardwalk; crust around hot springs is fragile and can crack.
  • Bear spray is advisable in Yellowstone; keep distance from wildlife and never approach animals.
ℹ️ Data Sources

Information is compiled from official sources, verified traveler reviews, and editorial research. Learn how YourNPGuide works →