Colorado has 46 hot springs, including 8 free primitive soaks and 38 paid resorts, the highest concentration of developed hot springs resorts of any US state, from the world's largest hot springs pool at Glenwood to alpine ice-and-steam soaks above 9,000 feet. Colorado is the only state with a signed "Historic Hot Springs Loop" driving route linking multiple resort towns. Springs cluster along the western slope in three main corridors: the Yampa Valley (Steamboat, Strawberry Park), the Roaring Fork Valley (Glenwood, Iron Mountain, Penny), and the San Juan Mountains (Ouray, Pagosa Springs, Orvis, Dunton, Rico). Flagship sites include Strawberry Park, Glenwood Hot Springs Pool, Ouray Hot Springs, Mount Princeton, and Cottonwood Hot Springs. Colorado's thermal activity is driven by deep faulting along the Rio Grande Rift and by heat from the San Juan volcanic field, producing surface temperatures of 90-150°F. Land ownership skews private-resort, with a smaller number of BLM and National Forest sites (Conundrum, Rainbow, Radium). Access is mostly drive-up, though Conundrum is a strenuous 8.5-mile hike each way. Best season is year-round while winter soaking is the state's signature experience. Gateway airports are Denver, Aspen, Durango, and Grand Junction. Clothing-optional is limited (Orvis, Dunton private, Valley View) while resorts require swimwear. Reviewed and updated July 2026. Use the map to build a resort loop or find winter-accessible free soaks.
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