There is a particular kind of quiet that settles over you the first time you lower yourself into natural hot springs. Steam curls off the surface, the air smells faintly of minerals and wet stone, and somewhere beneath you, water that fell as rain or snow thousands of years ago is finally surfacing after a long trip through the planet’s crust. No one built this. No one plumbed it. It simply arrives, warm, from the ground.
That is the appeal of natural hot springs, and it is why people drive hours down washboard roads and hike through snowy forests to reach them. But “natural hot springs” covers a huge range of experiences. A pool scooped out of a riverbank in the Idaho backcountry has almost nothing in common with a landscaped resort with stone terraces and a restaurant, even though both are fed by the same kind of geothermal water.
This guide is the pillar overview we wish we’d had when we started soaking. You’ll learn how hot springs actually form, how to tell primitive, developed, and resort springs apart, where in the US the best concentrations of natural hot springs are, and how to soak in a way that keeps you safe and keeps the springs around for the next person. Soakr’s database now holds more than 2,000 springs, and the patterns across all of them are what shaped this guide.
What Makes a Hot Spring “Natural”?
A natural hot spring is a place where geothermally heated groundwater reaches the surface on its own. The key word is heated by the earth. Unlike a hot tub, which uses a heater and a pump, a natural spring gets its warmth from the planet, and its water arrives without any mechanical help.
Some springs are left entirely alone, with a pool shaped by nothing but erosion and a few hands moving rocks around. Others have been channeled into concrete pools, piped into bathhouses, or cooled with a stream of creek water to make them comfortable. All of these can legitimately be called natural hot springs, because the heat and the water source are natural even when the pool around them is not.
That distinction matters, because “natural” on a sign doesn’t tell you much about what you’re walking into. It might mean a wild pool at the end of a long trail or a polished resort with changing rooms and a gift shop. Understanding the categories, which we’ll cover below, is the fastest way to match a spring to the kind of day you want.
Hot Spring vs. Warm Spring vs. Geothermal Feature
Geologists draw a few careful lines here. A hot spring is generally one whose water is notably warmer than the surrounding air or ground. Warm springs are gentler and often found in places with less dramatic volcanic activity. Then you have fumaroles, mud pots, and geysers, which are geothermal features you can admire but should never touch, let alone climb into.
This is a real safety point and not just trivia. Some of the most famous geothermal areas in the country, including the ones around Yellowstone, are full of water that will seriously injure you. The springs you can soak in are the ones where the water has been cooled, diluted, or has naturally emerged at a tolerable temperature. If you’re ever unsure whether something is meant for soaking, assume it is not.
How Hot Springs Form
Understanding the geology makes you a better soaker, because it explains why springs cluster where they do and why they behave the way they do from season to season.
Water, Heat, and a Path to the Surface
Every hot spring needs three things: water, a heat source, and a pathway.
The water starts as rain and snowmelt that seeps down through cracks and porous rock. As it travels deeper, it gets heated. In volcanic regions, the heat comes from magma or recently cooled volcanic rock close to the surface. In other places, there is no volcano at all. The water simply sinks deep enough that the earth’s natural temperature increase with depth warms it, then rises again along a fault line.
That second path is why so many of the West’s best springs sit along faults. Cracks in the crust act as elevators, letting heated water rise faster than it can cool. When you drive through Nevada’s basin-and-range country or along the edges of Idaho’s mountain ranges, you’re crossing landscapes where the crust has been stretched and broken, and the hot water follows the cracks.
Why the West Dominates
If you look at where natural hot springs concentrate in the US, the pattern is hard to miss. The western states hold the overwhelming majority. Idaho, California, and Nevada lead in sheer numbers, with Oregon, Wyoming, Colorado, and Montana close behind. The reason is tectonic. The West is geologically restless, with active faulting, volcanic history, and thinned crust that lets heat rise.
The East has fewer, and they tend to be gentler. Arkansas is the famous exception, with a long history of bathing tied to its naturally warm waters. If you want a deeper look at that tradition, our history of hot springs bathing in America traces how these places shaped communities long before they became destinations.
Why Every Spring Is Different
Because each spring has its own plumbing, no two feel alike. The depth the water travels, the rock it passes through, and the amount of cooler groundwater that mixes in all change how a spring looks, smells, and feels. Some run clear and nearly odorless. Others are cloudy, mineral-rich, and tinted by algae in shades of green and orange. If you’re curious about what’s actually dissolved in the water and why it matters for how a soak feels, we break it down in our hot springs minerals guide.
Springs also change. Rain, snowmelt, drought, and even earthquakes can shift flow and temperature. A pool that was perfect last summer might be too hot in spring runoff or too cool during a dry stretch. This is one of the biggest reasons current, community-sourced information beats a static web page, and it is exactly why we built live check-ins into the Soakr app.
The Three Types of Natural Hot Springs
If you take only one idea from this guide, take this one. Natural hot springs fall into three broad types, and knowing which you’re headed to will shape everything from what you pack to how you behave. Soakr’s spring markers use these same categories so you can see at a glance what kind of experience awaits.
Primitive Springs: Wild and Unmanaged
Primitive springs are the wild ones. There’s no staff, no front desk, and usually no facilities of any kind. You find a pool, often shaped by a few rocks stacked to hold the water, and you share it with whoever else showed up.
The rewards are real. Primitive springs tend to sit in spectacular places, from alpine meadows to desert canyons to riverbanks lined with cottonwoods. They’re often free, and they offer a sense of discovery that managed places can’t quite match.
The tradeoffs are just as real. You’re responsible for your own safety, your own trash, and your own judgment. Water quality isn’t monitored. Access can range from a short stroll to a serious hike, and conditions change without warning. Many primitive springs are also on public land with their own rules, so it’s worth knowing what applies before you go.
A few examples of the primitive experience done well:
Goldbug Hot Springs in Idaho’s Salmon River Mountains is a favorite among hikers, with a series of pools stepping down a mountainside and big views to match. Many soakers consider it among the most beautiful in the country, and our complete guide to Goldbug covers the experience in depth.
Deep Creek Hot Springs in California’s San Bernardino Mountains offers a canyon setting with pools along a creek, a popular escape with a lively, welcoming atmosphere. See our guide to Deep Creek for more.
Spencer Hot Springs in central Nevada sits out in open high desert, where the sky does most of the work. Soaking there at night under a ridiculous number of stars is the kind of memory people bring up years later.
Discover these springs, plus GPS directions, trail details, and real-time community conditions, in the Soakr app. Download free for iOS
Developed Springs: Wild Water, Light Touch
Developed springs sit in the middle. Someone has put in some infrastructure, such as built pools, a parking area, a bit of fencing, or a small changing area, but the experience remains rooted in the landscape. Some are free and maintained by land managers or volunteers. Others charge a modest fee and have a caretaker.
This category is where a lot of people find their sweet spot. You get the setting of a natural spring with fewer unknowns. Pools are often easier to access, temperatures are more manageable, and the rules are clearer.
A few that show the range:
Strawberry Park Hot Springs near Steamboat Springs, Colorado, is a beloved forest setting with natural rock pools and a famously relaxed evening atmosphere. It’s one of the most-searched springs in the country for good reason, and our guide to Strawberry Park walks through what to expect.
Terwilliger Hot Springs in Oregon’s Cascade foothills, often called Cougar Hot Springs, is a series of tiered pools tucked beneath old-growth forest. It has the kind of green, mossy beauty the Pacific Northwest does best.
Bagby Hot Springs is another Oregon classic, set deep in a mossy forest with hand-hewn wooden tubs. Read our complete Bagby guide before you go.
Explore all of these and more, with filters for primitive, developed, and resort springs, in the Soakr app. Download Soakr free for iOS
Commercial and Resort Springs: Soaking with Services
At the far end are commercial and resort springs. Here the spring water is captured and routed into purpose-built pools, often with multiple temperature options, staff, food, lodging, and a full day-use or overnight experience. Some are historic bathhouses. Others are luxury destinations with spa programs and high-end rooms.
These are the easiest springs to visit and the most predictable. Water is typically monitored and maintained, which makes them a good choice if you’re nervous about wild water quality, traveling with kids, or just want a comfortable day without logistics. They’re also where you’ll most often find a reservation requirement, especially on weekends and in peak season.
Examples across the spectrum:
Glenwood Hot Springs in Colorado is a historic landmark with a long tradition of mineral bathing. See our Glenwood guide for the story.
Breitenbush Hot Springs in Oregon is a retreat-style community in the forest, with a distinctive, contemplative feel. Our Breitenbush guide covers what makes it special.
Dunton Hot Springs in Colorado’s San Juan Mountains is a restored mining-town resort that pairs rustic charm with real luxury. If upscale soaking appeals to you, our roundup of the best luxury hot springs resorts in America is a good next stop.
Find your ideal resort soak, plus current conditions and booking details, in the Soakr app. Download free for iOS
Where to Find Natural Hot Springs in the US
You can find natural hot springs in nearly every part of the West, plus a few surprises elsewhere. Here’s a feel for what each major region offers, with links to deeper state-by-state coverage.
Idaho: The Soaking State
Idaho is arguably the best state in the country for natural hot springs, with a density and variety that’s hard to match. Mountain ranges, river canyons, and forested valleys are dotted with pools, from wild riverside soaks to rustic developed spots. With hundreds of springs recorded, it’s a place you could spend a whole season exploring. Start with our Idaho state guide or the in-depth 15 best hot springs in Idaho.
California and Nevada: Desert Soaks and Mountain Canyons
California offers everything from desert oases to Sierra Nevada pools, and Nevada’s remote basins hide some of the most atmospheric wild soaking anywhere. Both states reward people who like a bit of exploration. Our California guide and Nevada guide are good starting points, along with the best hot springs in Nevada for a deeper dive into the desert.
Oregon and Washington: Forest Soaks
The Pacific Northwest delivers green, mossy, rain-fed springs surrounded by old-growth trees. The vibe here is quieter and more forested than the desert West. Browse the Oregon guide and the Washington guide, or read about hot springs near Portland if you’re planning a day trip.
Colorado, Utah, New Mexico, and Wyoming: Mountains and Mesas
The Rockies and the Southwest bring high-country scenery and a big spread of options, from famous developed pools to backcountry hikes. Colorado alone offers everything from backcountry classics to historic resorts. Our Colorado guide is a great way in, and if you’re drawn to a challenge, see our Conundrum Hot Springs guide for one of the most iconic backcountry soaks anywhere.
Beyond the West
Don’t overlook Alaska, where soaking under the northern lights is a genuine possibility, or Arkansas, home to a unique bathhouse tradition. Hawaii also has a handful of volcanic-heated pools. The Alaska guide and Arkansas guide will point you in the right direction.
How to Find Natural Hot Springs Near You
Searching “hot springs near me” will give you a list, but not always a useful one. Many results are paid listings or places that have closed, changed hands, or restricted access. A few habits make your search much more reliable.
Start by deciding what kind of day you want. A relaxed resort soak and a multi-hour backcountry hike lead to very different lists. Then look for current information, such as recent community reports, rather than a single review from years ago. Springs change, and so do the rules around them.
Our full walkthrough, how to find hot springs near you, covers the search strategies that work. And if you live near a major city, check our regional roundups, such as hot springs near Denver, for ideas that fit a day trip or a weekend.
This is also where a dedicated app earns its keep. Soakr lets you filter by spring type, browse a map of 2,000+ springs, and save offline maps for places where cell service disappears, which is nearly every wild spring worth visiting.
Temperature and Water Safety: What Actually Matters
Natural hot springs are not regulated like pools. Nobody tests them on a schedule, adjusts the heat, or adds disinfectant. That makes a bit of knowledge go a long way.
Respect the Heat
Spring water can range from pleasantly warm to dangerously hot, and you often can’t tell by looking. Clear, calm water can be hot enough to cause serious burns. Before you get in, test the water with your hand, then your foot. Enter slowly. If a pool feels uncomfortably hot, it is. Don’t try to tough it out.
Heat affects your body in ways that sneak up on you. Limit your time in the water, step out to cool down regularly, and get out right away if you feel dizzy, lightheaded, nauseated, or unusually tired. Drink water before and after, and avoid alcohol, which makes the effects of heat much stronger. People with heart conditions, low blood pressure, or pregnancy should talk to a doctor first. Our hot springs safety guide goes deeper, and the pregnancy guide covers that topic specifically.
Stay Out of Thermal Features
Never enter water in an area marked as dangerous, and never walk on thin, crusty ground around geothermal features. The ground around some thermal areas can look solid and break through into scalding water. Stay on marked trails and boardwalks anywhere they exist. If a spring is fenced off or signed against soaking, that sign exists for a reason.
Water Quality and Your Head
Wild springs can contain bacteria and other organisms, and in rare cases, a dangerous amoeba found in warm freshwater can cause a serious infection if water enters through the nose. The risk is very low, but the simple precaution is easy: keep your head above water, avoid submerging your face, and don’t stir up sediment from the bottom. If you have open cuts or a weakened immune system, be extra cautious about soaking in unmanaged water.
Algae and discoloration are normal in many springs, but strong odors, unusual sheens, or signs of heavy contamination are good reasons to skip a pool and move on. When in doubt, a different spring is always an option.
Know Before You Go
Some springs sit in places with additional hazards, including slick rocks, flash flood-prone canyons, wildlife, and weather that turns fast. Tell someone your plan. Bring light, water, and layers. Check recent conditions, because a trail or access point that was fine last month may not be today. Live check-ins from other soakers in the Soakr app are built for exactly this kind of reality check.
How to Soak Responsibly
Safety protects you. Etiquette and stewardship protect the springs. Many of the wild places we love survive only because visitors treat them well, and several have been closed or restricted after repeated misuse.
Leave It Better Than You Found It
Pack out everything you bring in, including food scraps, bottle caps, and cigarette butts. Bring a small bag for any trash you find too, because someone else’s leftovers shouldn’t become the spring’s problem. Skip soap, shampoo, and sunscreen in the water, since even “natural” products harm the fragile ecosystems that surround springs. Rinse off before you get in.
Stay on existing trails and use established areas for sitting and changing. Trampled vegetation and eroded banks add up fast around small pools. If you do move rocks to adjust a pool, which is common at primitive springs, keep changes minimal and gentle.
Share the Space
Primitive springs are communal by nature. Keep your voice and music down, leave room for newcomers, and don’t treat a pool as your private property. Many springs have unwritten norms about quiet hours, and some are clothing optional. If you’re not sure what to expect, our clothing optional hot springs guide explains the customs, and our hot springs etiquette guide lays out the rules worth knowing.
Ask before taking photos, and never photograph other people without their consent. A relaxed, respectful atmosphere is what makes these places feel like sanctuaries.
Honor the History
Many hot springs are sacred or culturally significant to Indigenous peoples, who used and revered these waters long before they appeared on any map. Approach them with humility. Our piece on Indigenous hot springs culture offers important context, and it’s worth reading before your next trip.
Follow the Rules, Including the Boring Ones
Respect closures, permit requirements, and day-use restrictions, even when they’re inconvenient. Land managers set them for reasons like protecting water quality, limiting crowding, and keeping visitors safe. Some springs require permits or advance reservations, so check ahead rather than showing up and hoping.
Choosing the Right Natural Hot Spring for You
With thousands of options, matching the spring to the moment is the real skill. A few questions help.
How adventurous are you feeling? If you want an easy afternoon, a developed or resort spring is a great choice. If you want the thrill of earning your soak, a hike-in primitive spring is hard to beat, and our guide to the best hike-in hot springs is a good place to start.
Who’s coming with you? Families and first-timers usually do best at developed springs with clear rules and easier access, and our hot springs for beginners and kid-friendly hot springs guides can help you plan. Couples might prefer something quiet and scenic, like the spots in our hot springs for couples roundup.
What season is it? Many springs shine in winter, when cold air makes the water feel even better, but road closures and snow change access dramatically. Others are best in summer or fall. See our guides to hot springs in winter and the best time to visit hot springs to time your trip.
Do you want to make a weekend of it? Pairing a spring with a campsite or a hike makes the trip richer. Our hot springs camping guide and hot springs after hiking both show how to build a day around the soak.
If you’re planning something bigger, our hot springs road trip itinerary and the list of the 25 best hot springs in the US are great places to start dreaming.
What to Bring for a Natural Hot Springs Trip
Packing well turns a decent soak into a great one. The essentials are simple: a swimsuit (or not, depending on the spring), a towel, plenty of drinking water, sandals you can slip on and off, and a dry change of clothes. A bag for trash and a headlamp are smart additions, especially if you’ll be soaking near dusk, since many springs are hard to leave in the dark.
For wild springs, add layers, a small first-aid kit, and a way to navigate without cell service. A full checklist is in our hot springs packing list, which covers gear for every type of spring.
Natural Hot Springs FAQ
Are natural hot springs safe to soak in?
Often, yes, with common sense. The main risks are heat and water quality. Test the temperature before entering, limit your time, stay hydrated, avoid alcohol, and keep your head above water. Developed and resort springs are generally easier to judge than wild ones.
Are natural hot springs free?
Many are, especially primitive springs on public land. Developed and resort springs usually charge a modest fee. Our list of free hot springs in the US is a good place to look if budget matters.
What’s the difference between natural hot springs and a hot tub?
Natural springs are heated by the earth and fed by mineral-rich groundwater, while hot tubs use heaters and treated, recirculated water. We compare them in detail in hot springs vs hot tubs.
Do natural hot springs have health benefits?
Many people find soaking relaxing, and there’s some research on warm water and muscle comfort, circulation, and sleep. We cover what the science does and doesn’t support in health benefits of hot springs.
Start Soaking
Natural hot springs are one of the great gifts of the landscape: free heat, delivered by the planet itself, in some of the most beautiful places you’ll ever visit. Once you understand how they form, how primitive, developed, and resort springs differ, and how to keep yourself and the water safe, you’re ready to go find your own favorites.
Take it slow, start with a spring that matches your comfort level, and build from there. Every soaker has a first spring story, and yours is waiting.
Natural hot springs, including every spring mentioned in this guide, and over 2,000 more are in the Soakr app. Get GPS directions, community check-ins, photos, temperature data, and offline maps so you can find the right spring and soak with confidence. Download Soakr free for iOS