Challis Hot Springs State Park is a beautiful spot on the banks of the Salmon River in Central Idaho. Sitting about 5,000 feet above sea level, it is now part of Idaho’s state park system, which helps protect its natural and historic features.

The area is surrounded by rocky hills and valleys shaped by ancient volcanic activity.

The hot mineral water comes from deep underground, where the Earth’s heat warms it before it rises to the surface.

Visitors can soak in the warm pools, camp by the river, and explore the area’s rich geology and natural beauty.

Challis Hot Springs Geothermal Water & Soaking

The hot springs two pools: a large one measuring 100 by 30 feet and a smaller one 25 by 18 feet.

Geothermal water at about 127°F (53°C) bubbles up from underground springs through river rock bottoms. The large pool’s temperature varies seasonally, averaging 96°F (35°C) in summer and 98–100°F (37-38°C) in winter, while the smaller pool stays around 105°F (41°C) year-round.

Temperatures are adjusted manually by adding cold artesian water, so it’s best to enter the pools cautiously.

Both pools operate on a flow-through system, with fresh mineral water constantly replacing the old, eliminating the need for chemical treatment. The odorless, naturally soothing water provides a clean and relaxing soak.

Long before European settlers arrived, the land around the hot springs was home to Indigenous peoples who hunted, fished, and gathered in the fertile Round Valley. The warm waters and abundant resources made the area a natural gathering place.

The first Europeans came in 1822, when a group of fur trappers led by Michel Bourdon explored the region in search of beaver pelts. Later, in 1880, homesteader Robert Currie Beardsley became the first permanent settler. He claimed 40 acres, including the water rights, and began developing the property with a sawmill, hotel, barn, and house. He also improved the hot spring to make it more accessible and comfortable for visitors.

Over the years, the property changed hands many times, but the healing reputation of the geothermal mineral water has remained constant, along with each owner’s commitment to welcoming guests seeking rest and relaxation.

In 2023, the site entered a new chapter when it was acquired by the Idaho Department of Parks and Recreation. Today, it is managed as part of Land of the Yankee Fork State Park, ensuring that the historic hot springs and campground remain open to the public for future generations to enjoy.

Beyond soaking, visitors can explore ATV trails, hike, fish for trout and steelhead, kayak or raft the Salmon River, or simply enjoy the natural beauty of Round Valley.

The area is also home to numerous other hot springs, including Cronks Canyon Hot Springs to the north or Sunbeam and Boat Box Hot Springs to the east, each offering unique soaking experiences.

For geology and rock enthusiasts, the region has great rockhounding opportunities, with chances to find interesting minerals, agates, and fossils in the river valleys and surrounding hills.

If you just want to relax, you can take in the natural beauty of Round Valley, enjoy the mountains, and watch wildlife along the river.

The Challis Hot Springs Campground, now part of Idaho State Parks, offers tent and RV sites along the Salmon River.

Camping reservations are available from mid-March through November and typically handled through the Idaho Department of Parks and Recreation. Amenities include full or partial hookups, grassy tent spaces, restrooms, and showers. Overnight guests receive discounted access to the soaking pools.

Those preferring other accommodations can find hotels and vacation rentals in Challis.

Lodging In Challis

Affordable vacation rentals for short- and long-term stays in Challis

Location: 9 miles east of Challis • Idaho • USA
Open: Year-round except Thanksgiving and Christmas Day
Development: A large warm swimming pool and a small hot soaking pool
Clothing: Required
Amenities: Changing rooms, shower, picnic tables, a boat access

Hiking distance: Short
Road Access: Any vehicle
Day-use fees: Yes
Managed by: Idaho Department of Parks and Recreation

Elevation: 5,000 ft (1,524 m)

Water T° (source): 127°F (53°C)
Water T° (large pool): 96-100°F (35-38°C)
Water T° (soaking pool): 105°F (41°C)
Chemical used: None