These are natural pools with no front desk, no changing rooms and usually no entry fee. Most take a drive down a rough road or a hike to reach. Each page lists the trailhead and getting-there steps from official sources, so check conditions before you head out.
WildConundrum Hot Springs
Aspen
A remote wilderness soak south of Aspen, reached by a long hike of about 8 miles up Conundrum Creek Trail.
WildPenny Hot Springs
Redstone
A roadside spring on the Crystal River where visitors stack river rocks into soaking pools beside the water.
WildPinkerton Hot Springs
Durango
A roadside spring beside U.S. Highway 550 north of Durango, with an iron-stained rock mound and a small pool.
WildRadium Hot Spring
Kremmling
A natural spring beside the Colorado River on BLM land, reached on foot from the Warm Springs Road trailhead.
WildRainbow Hot Springs
Pagosa Springs
A riverside spring in the Weminuche Wilderness, reached by a hike of about 5 miles on the West Fork Trail.
WildSouth Canyon Hot Springs
Glenwood Springs
Undeveloped, unmanaged pools just west of Glenwood Springs, reached by a short hike.