Challis Hot Springs, Idaho: Pools vs Camping Guide

Where Challis Hot Springs sits

The springs sit about nine miles east of the town of Challis, Idaho, on the bank of the Salmon River at roughly 5,000 feet of elevation. Rocky hills and volcanic terrain surround the site, and the river runs right past the pools and campground. That roadside-adjacent position makes it an easy stop between the Sawtooth country to the west and the wide Salmon River valley to the north.

The site became part of the Idaho state park system when the Idaho Department of Parks and Recreation purchased it in 2023 and folded it into Land of the Yankee Fork State Park. That matters for planning: this is a managed facility with posted rules, a campground and staff, not a loosely maintained roadside pool. For a broader tour of the state's soaks, from primitive to developed, see this guide to hot springs in idaho.

Getting there from Challis and US 93

From the intersection of US 93 and ID 75 near Challis, drive about 1.5 miles east on US 93, turn left onto Hot Springs Road and follow it roughly 2.7 miles. Bear left onto Challis Hot Springs Road and continue about 2.4 miles; the entrance is on the left. The route is paved-road driving suitable for any vehicle, and the pools are a short walk from parking rather than a hike.

Because the drive is short and simple, Challis works well as an evening soak after a day on the river or as a lunch stop on the long haul between Stanley and Salmon. Save offline directions before you leave town, since cell coverage thins out in the surrounding hills. Fill your water bottles and fuel in Challis, where services are clustered.

The two pools

There are two pools. The larger one measures 100 by 30 feet and holds warm water, while the smaller pool is 25 by 18 feet and stays noticeably hotter. Both have river-rock bottoms and use a flow-through system, with fresh geothermal water constantly replacing the old, so no chemicals are added. Choose the big pool for swimming laps and cooling off, and the small one when you want heat.

Because the water is continuously exchanged rather than treated, it feels soft and odorless, closer to a river soak than a chlorinated public pool. Staff can adjust temperatures by adding cold artesian water, which is useful on a hot afternoon when the big pool runs warm. Ease in slowly, keep your head above the surface in untreated geothermal water, and watch your footing on the rock bottoms, which can be slick.

Water temperatures

The geothermal source comes up through river rock at about 127°F, hot enough that you should never step straight from the source into a soak. The large swimming pool averages around 96°F in summer and 98–100°F in winter, while the smaller soaking pool holds roughly 105°F year-round. That gap explains the crowd split: the big pool is comfortable for longer soaks and kids, the small pool is for short, hot sessions.

Seasonal swings in the swimming pool mean a July visit and a January visit feel different, so pick your pool by the numbers rather than by habit. On a cold morning, head for the small pool first and move to the big one as you cool down. On a hot day, the big pool at its summer average is the more comfortable choice.

Day-use details and what the site provides

Day-use visitors pay an entrance fee, and the site provides changing rooms, showers, picnic tables and boat access to the Salmon River. Clothing is required in both pools, which keeps the atmosphere family-friendly. The pools are open year-round apart from Thanksgiving Day and Christmas Day, so a winter soak is a realistic plan in this part of Idaho.

Look up the current day-use rate with Idaho Department of Parks and Recreation before you drive out, since rates change. Bring a towel, sandals for the changing area, and a water bottle; the dry central Idaho air plus hot water dehydrates you faster than you expect. A dry bag for phones and keys keeps river spray and pool splash from ending the day early.

Camping along the Salmon River

The Challis Hot Springs Campground sits along the Salmon River and offers tent and RV sites, including full or partial hookups, plus grassy tent spaces, restrooms and showers. Camping reservations run from mid-March through November through the Idaho Department of Parks and Recreation, and overnight guests get discounted access to the soaking pools. That discount is the main argument for staying the night rather than driving back to Challis.

Riverside sites put you a few steps from the water, which makes early-morning and late-evening soaks easy and avoids the midday day-use rush. Book ahead for summer weekends and holiday periods, when hookup sites go first. If you are traveling in a rig, check site length and hookup type with the Idaho Department of Parks and Recreation when you reserve through its camping reservation system.

Lodging in Challis instead

If camping is not your style, the town of Challis has hotels and vacation rentals within a short drive of the springs. Staying in town gives you a real bed, a shower and restaurant options, and you can still soak in the evening and be back for dinner. It also works well in the shoulder seasons, when nights along the river turn cold.

For a different developed-pool experience on an Idaho road trip, Lava Hot Springs, Idaho, in the southeast corner of the state, pairs a town full of lodging with odorless mineral pools. It is a long drive from Challis, so treat it as a separate leg rather than a day trip. If you are mapping a wider road trip, this Nevada guide covers the developed and wild soaks just across the state line.

What to bring for a comfortable soak

Pack a swimsuit, a towel, sandals and a change of clothes; the changing rooms and showers make a post-soak reset easy. Bring more water than you think you need and a hat for the walk between pool and car, because the site is exposed and the sun is strong at 5,000 feet. Water shoes help on the rocky pool bottoms.

Time your soaks in short blocks rather than settling in for an hour in the hot pool, and alternate with the cooler swimming pool. Keep glass away from the pool decks and follow the posted rules on food and drink. Children need supervision near the river as well as in the pools, since the current runs past the campground.

Best time to go

Summer brings the warmest swimming pool, around 96°F on average, and the busiest campground; spring and fall give you cooler air, fewer people and a hot small pool that feels better against a chill. Winter is quiet, the soaking pool holds near 105°F, and the big pool sits at 98–100°F, which makes a snowy soak genuinely appealing.

Midweek visits in June and September tend to be the sweet spot: open roads, comfortable air temperatures and space in the pools. Arrive early in the day for the thinnest crowds. The site closes on Thanksgiving Day and Christmas Day, so plan holiday travel around those dates.

Nearby soaks to add to the trip

East of Challis along the Salmon River, Sunbeam Hot Springs and Boat Box Hot Springs sit close to the highway, and Cronks Canyon Hot Springs lies to the north, so all three make easy add-ons to a Challis soak day. Each is a different experience, so plan them as separate stops rather than expecting the same facilities you get at Challis.

For a hike-in counterpoint in the same region, Goldbug Hot Springs south of Salmon rewards a steep two-mile climb with a chain of waterfall-fed pools in the Salmon-Challis National Forest; the trail crosses a quarter mile of private land before entering the forest, and overnight camping is prohibited within 500 feet of the pools. Expect rattlesnakes in warm months and carry extra water, since the route is exposed.

Farther afield, Heise Hot Springs near Idaho Falls offers a developed, family-oriented pool complex, and Burgdorf Hot Springs in the Payette National Forest is a rustic, remote alternative in the mountains to the west. Neither is a short detour from Challis, so slot them into a longer statewide loop.

Beyond soaking around Challis

The Salmon River supports trout and steelhead fishing, and rafting and kayaking are popular on the surrounding stretches of river. The hills around Challis are known for rockhounding, with agates, minerals and fossils turning up in the river valleys. Round Valley and the surrounding mountains give you hiking and wildlife-watching options when you want a break from the water.

A sensible day pairs a morning on the river or a hike with an afternoon soak, then dinner in Challis. Build in a buffer for wildlife on the road at dusk, since deer and other animals move through the valley in the evening.

Plan Your Challis Hot Springs Trip

Challis Hot Springs is the rare central Idaho soak that asks nothing more than a short walk and a day-use fee: a big warm swimming pool for families and lap swimmers, a small hot pool for a quick, intense soak, and a riverside campground for those who want to stay. Base yourself in Challis or at the campground, and use the site as a comfortable anchor for fishing, rafting and rockhounding.

Add Sunbeam or Boat Box to the drive east, or plan a primitive hike to Goldbug if you want contrast, then close the loop through the broader Idaho hot springs circuit. Reserve campsites early for summer weekends, and confirm the day-use rate and holiday schedule with Idaho Department of Parks and Recreation before you go.