1. Strawberry Park Natural Hot Springs, Steamboat Springs
Nestled along Hot Springs Creek outside Steamboat Springs are some of Colorado's — maybe even the world's — most beautiful hot springs. Strawberry offers multiple pools set at different temps and on-site lodging (that must be booked way in advance and through snail mail, per its website) for weekend trips. If you really want to relax, be sure to book a traditional massage or a "watsu," which is delivered in a warm-water pool. Visit strawberryhotsprings.com for more details about accommodations, pricing and advice on how to get to the hot springs. And be prepared for guests in their birthday suits.
2. Iron Mountain Hot Springs, Glenwood Springs
Two and a half hours from Denver are the Iron Mountain Hot Springs, which consist of sixteen natural mineral soaking pools with temperatures that range from 99 to 108 degrees, along with a freshwater family pool. As the name implies, the waters are rich in minerals including iron, which is known for its relaxing properties. Perhaps best of all, the pools have excellent views of Mt. Sopris, Red Mountain, the Colorado River and the Roaring Fork Valley. Find more information at ironmountainhotsprings.com.
3. Hot Sulphur Springs Resort & Spa, Hot Sulphur Springs
Heated by volcanic rock some 35,000 feet below Earth's surface, the seven natural springs here range in temperature from 104 to 126 degrees. They also fill 21 mineral pools with hot water chock-full of all sorts of good stuff for your skin, including sulfate and magnesium. Hot Sulphur also offers a wide range of therapeutic services, including body massages, hot-rock massages and rain-drop therapy. Visit hotsulphursprings.com for more.
4. The Springs Resort & Spa, Pagosa Springs
Situated along the San Juan River, the Springs Resort & Spa boasts the world's deepest geothermal hot spring, measuring at least 1,002 feet deep. The water from the "Mother Spring," as it's known, comes in at 144 degrees but cools down a bit to fill the 23 soaking pools. The resort offers world-class lodging, and the spa's massages comes in everything from couples sessions to "scent-sation" treatments that incorporate essential oils. Visit pagosahotsprings.com for more information.
5. Cottonwood Hot Springs Inn & Spa, Buena Vista
More rustic than some of the aforementioned spas and resorts, the Cottonwood Hot Springs Inn & Spa's soaking pools range in temperature from 94 to 110 degrees. Accommodations are more affordable, too, with cabins, dorms and hotel rooms available for as low as $139 a night per room or $55 per person for a single bed in the dorms. Spa services range from massages to tarot card readings, crystal work, facials and body scrubs. Once you've replenished your relaxation center, head into Buena Vista to tour an adorably quaint mountain town. Visit cottonwood-hot-springs.com for more information.