"The beautiful Cowboy State is home to countless natural wonders, from mountain ranges and geological anomalies to rivers and hot springs in Wyoming. Not many people associate hot springs with Wyoming and might be surprised to discover that the world’s largest hot spring is found right here in the Cowboy State," the Only In Your State says.

"Thermopolis itself is a charming town, with homestyle restaurants, interesting boutiques, and one of the best dinosaur museums in the world. You'll find the world's largest hot springs on the outskirts of town, in the cleverly named Hot Springs State Park.

"The Big Spring (again with the clever names, Wyoming) is the single largest mineral hot spring in the world. These natural wonders are open to the public for free exploration as a result of a treaty signed in 1896 with local Native American tribes. One of the coolest features in the park is man-made. Don't forget to stop by the TePee Fountain, which was made by pumping hot mineral water through a pipe and allowing it to evaporate, leaving mineral deposits behind."

"Thermopolis is located in the Big Horn Basin of northwest Wyoming. Surrounded by mountain ranges with the Big Horn River running through town, Thermopolis boasts the world's largest mineral hot springs. Averaging over 200 days of sunshine a year, outdoor adventure abounds. There is plenty to do indoors as well," the Thermopolis-Hot Springs Chamber of Commerce says.

"The world's largest mineral Hot Spring is evidence of once great subterranean forces.     Today, their even flow is metered primarily for recreational and therapeutic purposes.

"Located in the Hot Springs State Park, there are two (2) commercial swimming facilities, Hellie's TePee Pool & Spa and Star Plunge, that are a great place to swim, slide or just relax in the mineral water. The State of Wyoming also operates the State Bath House, where you can only soak in the warm water for 20 minutes at no charge."

"Many Indigenous peoples believe the hot springs in Wyoming possessed healing powers, while settlers stopped at the naturally heated pools to soak their weary feet during their travels westward. Today’s visitors flock to soaking spots throughout the state to relax, recharge and admire the surrounding scenery," the Travel Wyoming says.

"Open year-round, these steamy hot springs attractions are especially fun in chilly weather, when swirling snowflakes make the warm waters even more enchanting. Experience the wonder for yourself at one of these popular Wyoming hot springs.

"Star Plunge is an entire family fun center. The indoor and outdoor pools are heated by the Big Spring, and the water has at least 27 different minerals. After a soothing soak, explore the rest of the park featuring multiple water slides, the vapor cave, sun decks, a game room, a gift shop and more."

"At the center of all the activities in Hot Springs State Park is the Big Spring. The turquoise and green mineral-laden spring issues 3.6 million gallons of water per day at a scorching 127 degrees. The water contains at least 27 different minerals and feeds all the attractions within the park. The practice of using natural mineral water for the treatment or cure of disease is known as “balneology,” the Invest In HS County says.

"Soaking in highly concentrated mineral water is thought to have many health benefits such as increased body temperature, which aids in killing harmful germs and viruses, eliminate toxins, increase blood flow and circulation, increase metabolism, and absorb essential minerals.

"Whether you are coming to Thermopolis for the healing waters or just to have a family fun day, we have three great options for your swimming pleasure. None of our water are treated with chlorine and are all-natural, just the way nature intended!"

World's Largest Mineral Hot Springs



"Inscription. [Click to hear the inscription.] See this natural phenomenon while you are in Thermopolis. Monument hill, pictured here, and visible from this site, overlooks the "Big Spring". See other springs and beautiful terraces created by the mineral deposits of these healing waters. Learn the history of the Indians 'Gift of the Waters' to the White man. See large Buffalo herd. Avail yourself of many Park facilities. No Entrance Fee.

"Location. 43° 38.724′ N, 108° 13.788′ W. Marker is in Thermopolis, Wyoming, in Hot Springs County. Marker is on State Highway 120 near Fremont Street. Touch for map. Marker is at or near this postal address: 111 Wyoming Highway 120, Thermopolis WY 82443, United States of America."

"The Big Horn Hot Springs State Reserve became Wyoming’s first state park in 1897 and quickly became a popular destination for tourists and those seeking healing in the therapeutic mineral hot springs," the Hot Springs Travel & Tourism says.

"As part of the original agreement with the Eastern Shoshone and Northern Arapaho tribes, who sold the land to the federal government, access to the mineral hot springs would remain free. Today, the Hot Springs State Park honors that treaty. A free bath house is open to the public year-round and the water is maintained at 104 degrees for therapeutic bathing.

"The world-famous mineral hot springs flows over the park’s colorful terrace every 24 hours at a constant temperature of 128 degrees Fahrenheit. It is a full-service day-use park with comfort stations, trails, fishing, and a boat ramp."

"This natural wonder lies within Hot Springs State Park in Thermopolis, Wyoming. The liquid that forms the World’s Largest Mineral Hot Springs begins its journey in the Owl Creek Mountains, eventually making its way underground," the Free Fun Guides says.

"It’s there where the heating element does its work, a volcanic action that brings the average temperature of the Springs to 135 degrees Fahrenheit. The mineral component of the Springs comes with the absorption of chemicals from rocks, and gasses associated with the volatile interior of the earth.

"And when it all gathers, when it pools at the World’s Largest Mineral Hot Springs, it becomes the World’s Largest, with an infusion of an amazing 18 million, 600 thousand gallons a day. The World’s Largest Mineral Hot Springs lie in the middle of Wyoming and provide a wonderful experience in the sheer power and mystique of the earth below. It’s a soothing dip into the natural waters at The World’s Largest Mineral Hot Springs."

"Considered a gateway community into Yellowstone National Park—a mecca for hot spring fanatics—Thermopolis claims bragging rights to the world’s largest mineral hot springs. As you might suspect, a key attraction in Thermopolis is Hot Springs State Park, a state-owned public recreation along the Big Horn River and just outside of downtown," the Road Trip For Families says.

"Admission to the Hot Springs State Park is free and the “main attraction” is the Big Spring, a mineral spring flowing at a rate of 8,000 gallons per day over the Rainbow Terraces. A paved pedestrian path leads up to the mouth of the spring and includes a one-story viewing platform looking out over the park and river. Note the temperature of the water flowing from the Big Spring is a constant 135 degrees Fahrenheit, so keep a close eye on your pets and kids.

"Other points of interest include picnic grounds, a suspension bridge over the Big Horn River, and public roads that loop through the state’s largest bison herd (obviously stay in your car and use common sense if you decide to do this). The park also manages the petroglyph site at Legend Rock located twenty five miles outside of town. If you want to visit Legend Rock you will need to register for a gate key with the ranger on station at the State Bath house desk."

"Hot Springs State Park, located in Thermopolis, Wyoming, is a place of natural wonder and historical significance. This unique park is renowned for its geothermal features, including the world’s largest mineral hot spring, Big Spring," the Geology Science says.

"The park’s thermal waters have been attracting visitors for centuries, with indigenous peoples and early settlers recognizing their healing properties. In the late 19th century, it became a popular destination, and the state eventually designated it as a public park in 1897, making it one of the oldest in the United States.

"Today, visitors can enjoy not only the soothing hot springs but also a variety of recreational activities and a glimpse into the park’s rich history, making it a must-visit destination in the American West. Geothermal activity in Hot Springs State Park is of immense ecological, recreational, and therapeutic importance. It sustains unique ecosystems adapted to the warm waters and provides a habitat for various plant and animal species. Additionally, the therapeutic properties of the hot springs have made the park a popular destination for relaxation and healing for centuries, attracting visitors seeking relief from various ailments."

"Over colorful terraces along the Big Horn River at Thermopolis flows water from mineral hot springs. More than 8,000 gallons flow over the terrace every 24 hours at a constant temperature of 135 degrees Fahrenheit. The park has a free bath house where the water is maintained at 104 degrees for therapeudic bathing. Hot Springs has 6.2 miles of universally accessible trails and hiking trails. It is a full-service park with comfort stations, a Volksmarch trail, fishing, and a couple of boat docks. One of the reservable group picnic shelters is located here. Hot Springs is a day-use park," the Wyoming State Parks says.

"The Hot Springs State Park bison herd is the central herd for the Wyoming State Parks. During the late fall and winter months, the park bison are fed a daily supplement to insure good health. This feeding usually occurs at 8:30 a.m., giving the off-season visitor the unique opportunity to view the "Monarch of the Plains," up close. Please remember that bison should be viewed ONLY while you remain in your vehicle.

"The suspension foot bridge across the Bighorn River is commonly called "The Swinging Bridge." The bridge offers a unique vantage point from which to view the Bighorn River and mineral terrace. Hot Springs State Park has long been known for its beautiful summer flower gardens. Make a point to bring your camera with you, and capture the exciting splash of color all summer long. There are three large group picnic shelters in the park available by reservation. These are very popular and heavily used. Contact park headquarters as soon as you can to reserve a shelter for your event and also, inquire if your group needs a park liquor permit."

World's Largest Mineral Hot Springs Pool: world record in Glenwood Springs, Colorado