If you're searching for the best free hot springs in Wyoming or you want a simple, relaxing soak that doesn't break the bank, the State Bath House in Thermopolis is the place.

Just under two hours from Casper and less than three from Yellowstone, this historic Wyoming hot springs bath house sits right inside Hot Springs State Park. It's easy to find, right off US-20 and feels like a hidden gem that everyone should know about.

The Bath House is a modern white building that sits beside colorful mineral terraces, with steam rising from the pools and the scent of sulfur in the air.

State Bath House Hot Springs Water & Soaking

The hot mineral water flows right out of the earth at 135°F (57°C) before it's cooled to a safe and soothing 104°F (40°C) in the bathhouse pools. That's the perfect temperature for soaking. It's hot enough for comfort but not too much to handle.

Here's what you can expect at the State Bath House:

• Two public mineral pools: One indoor, one outdoor.
• Water temperature: Both pools are always 104°F (40°C), year-round.
• Time limits: You are limited to 20 minutes in the indoor pool and 20 minutes in the outdoor pool because of health and safety concerns.
• Free entry: That's right, no fee for soaking. It's a true Wyoming treat.
• Open hours: 8 a.m. to 1 p.m. every day (check for changes in winter and holidays).
• Sulfur scent: The water has a slight sulfur scent.

Did you know? The State Bath House sees thousands of visitors each year, with over 18,000 gallons of hot water flowing through every 24 hours.

Swimsuits are required. There are locker rooms, showers, and plenty of places to relax between soaks.

The State Bath House is just one part of Hot Springs State Park. When I finish soaking, I like to:

Walk the terraces: The colorful mineral terraces are right outside and look amazing in the morning light.

See the bison herd: The park has a herd of about 15 bison. In the winter, you can watch them get fed.

Hike the trails: There are 6.2 miles of accessible trails. Some are flat and easy, perfect for families.

Fish or boat: The Big Horn River runs through the park and is great for fishing or just watching the water roll by.

And if you want more soaking, the Best Western Plus Plaza Hotel and the Thermopolis Hot Springs Hotel and Spa are the top spots in the city.

Location: Thermopolis • Hot Springs County • Wyoming • USA
Open: Year-round (hours: 8 a.m. – 1 p.m.; check for winter/holiday changes)
Development: Indoor and outdoor public pools, locker rooms, showers
Clothing: Mandatory
Amenities & Services: Free parking, changing rooms, restrooms

Hiking distance: Short
Road access: Any vehicle
Day-use fees: None (free for everyone!)

Elevation: 4,331 ft (1,320 m)