Climb Ojos del Salado: the complete guide to the highest volcano on Earth
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There is a strange arithmetic to Ojos del Salado. At 6,893 metres it is the second-highest mountain in the Americas, a whisker below Aconcagua. It is the highest volcano anywhere on the planet. It cradles the highest lake on Earth's surface, a small permanent crater pool sitting above 6,000 metres that most people will never see and fewer still will believe exists. And yet, here is the part that reorders your whole idea of what a giant mountain demands, its normal route is, for almost its entire length, a walk. Only the final summit block asks for a rope and a moment of real mountaineering.
If you want to climb Ojos del Salado, that is the fact to hold onto. This is the biggest "highest" left on most climbers' lists that a fit, patient, well-acclimatized trekker can genuinely attempt. The difficulty isn't the terrain. It's the altitude, the wind, and the sheer high, dry hostility of the Atacama Desert, which surrounds the mountain like a moat of Mars.
This guide covers where Ojos del Salado sits and why it holds so many records, the Chilean and Argentine routes, the acclimatization that makes or breaks the climb, permits and season, real 2026 costs, and how to choose an operator for a mountain where the margin for error is thinner than the map suggests.
The highest volcano on Earth: why Ojos del Salado holds so many records
Ojos del Salado straddles the Chile–Argentina border in the heart of the Atacama, the driest non-polar desert in the world. Its name, "eyes of the salty one", comes from the eye-like pockets of glacial ice scattered across its salt-crusted flanks, remnants of moisture in a place that receives almost none.
It is a stratovolcano, and technically an active one: it last showed minor activity in historical memory and still emits the occasional gas plume, which is exactly why it, not the slightly-higher Aconcagua, wears the crown as the world's highest volcano. On one of its eastern craters sits a small permanent lake at roughly 6,390 metres, recognized as the highest lake on Earth, a body of water surviving at an altitude where the air holds less than half the oxygen of sea level.
The extremity of the place has made it a magnet for record-chasers of every kind. Its lower slopes hold the world altitude record for a wheeled vehicle, set by modified vehicles grinding past 6,000 metres on the loose scree. NASA and astrobiologists study the Atacama around it as a Mars analog, because the combination of extreme dryness, thin air, and intense UV is the closest thing on Earth to the surface of another planet. Standing on the summit, you are as far from ordinary human experience as a mountain gets while still being, mechanically, a walk-up.
Ojos del Salado vs. Aconcagua and Cotopaxi: where it fits
If you have been building an Andean climbing résumé, Ojos del Salado slots into a very specific place in it.
Compared with Aconcagua, it is only about 70 metres lower but far less trafficked, far more remote, and, on its normal route, arguably more attainable, because it has no long, punishing summit-day slog to compare with Aconcagua's Canaleta. What it lacks is Aconcagua's infrastructure: there are no large base camps with medical tents and helicopter evacuation on standby. You are much more on your own.
Compared with a volcano like Cotopaxi in Ecuador, Ojos del Salado is a different order of undertaking entirely: nearly a kilometre higher, in a vastly harsher and more isolated environment, with a summit that requires scrambling and a short technical section rather than a glacier plod. Cotopaxi is a serious climb you can do inside a long weekend from Quito. Ojos del Salado is an expedition that eats the better part of two weeks and demands you arrive already acclimatized.
That is the honest framing: not the hardest big mountain in the Andes, but one of the most committing, precisely because it is so remote and so high with so little between you and a problem.
The routes: the chilean normal route and the Argentine side
Two approaches account for nearly all ascents, and the choice is really a choice of country and character.
The Chilean Normal Route is the classic and the most popular. It stages out of Copiapó, a mining city on the Pan-American Highway, and climbs the mountain from the west via two high refuges: Refugio Atacama at around 5,200 metres and Refugio Tejos at around 5,800 metres, simple metal huts that serve as your upper camps. From Tejos, summit day climbs long scree slopes to the base of the summit crater, where the route steepens into a short rock scramble, often with a fixed rope, to gain the true summit on the border. It is the line with the most established logistics, the acclimatization-friendly nearby peaks, and the famous stopover at Laguna Verde, a startlingly green altiplano lake with natural hot springs at its edge, one of the great acclimatization luxuries in mountaineering.
The Argentine side approaches from Catamarca Province and the Fiambalá region, a quieter, wilder, and more expedition-style route that sees a fraction of the traffic. It rewards climbers who want solitude and a stronger sense of exploration, at the cost of longer, rougher logistics.
For a first attempt, the Chilean Normal Route is almost always the right answer: better huts, better acclimatization options, and the Laguna Verde hot springs to soak tired legs at 4,300 metres.
Why the altitude, not the climbing, is the real challenge
Read a route description of Ojos del Salado and it sounds almost gentle: scree, a refuge, more scree, a short scramble. This is exactly the trap. The mountain's difficulty is not written in its terrain. It is written in its air.
Above 6,000 metres you are in what physiologists loosely call the death zone's antechamber, an altitude where the body cannot acclimatize indefinitely and simply degrades over time. Summit day starts near 5,800 metres and climbs past 6,890. The cold is severe, the wind on the exposed upper mountain is relentless, and the Atacama's dryness dehydrates you faster than you notice. None of this is dangerous if you respect it. All of it is dangerous if you don't.
The single most important variable is acclimatization, and the maths is unforgiving: your body needs repeated exposure to altitude and time to adapt, and there is no fitness level or supplement that replaces it. The Wilderness Medical Society's altitude guidelines describe the same escalating risks, Acute Mountain Sickness, and the rarer but lethal HACE and HAPE, that every high-altitude climber must be able to recognize. On a mountain this remote, the ability to turn around early is worth more than any amount of strength. Our guide to altitude acclimatization for Latin America's high-altitude treks is worth reading in full before you commit to a peak this high.
A well-designed itinerary handles this with acclimatization climbs on nearby 5,000 and 6,000-metre peaks, often the beautiful, accessible cones around Laguna Verde, before ever setting foot on Ojos itself. Some operators now shorten the on-mountain time by having clients arrive pre-acclimatized after weeks of sleeping in altitude tents at home. Whatever the method, skipping the process is how a walk-up becomes a rescue.
Season, permits, and logistics from Copiapó
The climbing season runs through the southern summer, roughly November to March, when temperatures on the upper mountain are survivable and the fierce winter winds ease. Even in season, weather windows govern everything, and the wind is the variable most likely to send you home short of the top.
The logistics thread through Copiapó, reachable by a short flight or long drive from Santiago. From there, expeditions drive up into the altiplano, a spectacular ascent past salt flats, flamingo lagoons, and vicuña herds, staging at Laguna Verde before moving up to the refuges.
The permit picture matters and is easy to underestimate. Because the summit sits on the international border, climbers on the Chilean side need a border-zone permit from Chile's DIFROL (Dirección Nacional de Fronteras y Límites del Estado), which should be arranged well in advance, plus registration with CONAF/park authorities and, in practice, coordination with local logistics because the roads and refuges sit in a sensitive frontier region. A reputable operator handles all of this for you; an independent attempt means doing the paperwork yourself, correctly, before you arrive. Building a buffer day into your itinerary for permits and weather is not optional.
What an Ojos del Salado expedition costs in 2026, and how to choose an operator
Confirmed 2026–27 group expeditions on the Chilean Normal Route generally run in the range of USD $3,900–$4,500 for the mountain portion, typically covering around two weeks that include acclimatization around Laguna Verde, the refuge stages, summit attempt, and 4x4 logistics, but not international flights, personal gear, or, usually, the DIFROL permit fee. Private and custom trips cost more; longer, more conservative itineraries with extra acclimatization days cost more still and summit more people, which is exactly the trade-off worth paying for.
When you vet an operator for a mountain this remote, the questions are less about luxury and more about survival margin:
Ask about guide-to-client ratios on summit day and whether the guides are certified mountain guides with genuine high-altitude experience on this specific peak. Ask how many acclimatization days the itinerary builds in and which warm-up summits it uses, a program that rushes you to Tejos in a few days is a program with a low success rate and a real safety problem. Ask about emergency planning: what the evacuation options actually are from a mountain with no helicopter base and no medical tent, what communications they carry, and whether they carry supplemental oxygen and a hyperbaric bag. Ask about turnaround discipline, a good outfit will talk openly about turning clients around, because on Ojos del Salado the mountain is not going anywhere and the descent is where composure counts.
For travelers who want the summit without assembling all of this themselves, the value of a verified operator is precisely that they have already solved the logistics, the permits, and the safety systems that this environment demands. Browse Outer's high-altitude and mountaineering experiences across Latin America to find operators vetted for exactly this kind of serious, remote objective.
The Roof of the Volcanic World
Ojos del Salado is a rare kind of prize: a genuine world superlative, the highest volcano on Earth, the guardian of the highest lake on the planet, that sits within reach of anyone willing to respect the altitude and give the mountain the time it demands. It will not test your ability to climb. It will test your patience, your acclimatization, your judgment, and your willingness to walk away from the summit if the mountain says no.
Get those right, and there are few feelings in the Andes to match standing on that wind-scoured border summit, the Atacama unrolling beneath you toward the curve of the earth, knowing that on the entire planet only a scattering of Himalayan and Karakoram climbers are standing higher and not one of them is standing on a volcano.