Walking the world's driest desert: your complete trekking and adventure guide to Chile's Atacama

The Atacama Desert looks like it was built as a provocation. Its salt flats reflect the sky so perfectly you lose the horizon. Its geysers shoot boiling water at 4,500 meters above sea level while the air temperature sits near zero. Its valleys are so alien that NASA uses them to test Mars rovers and astronomers from around the world come here because the sky is cleaner than anywhere else on the planet.

Most travelers who come to the Atacama spend three days on a tour package, tick the geysers and the salt flat, take a photo in front of a flamingo, and leave. That's fine. But this guide is for the ones who want more: the multi-day treks, the high-altitude routes, the hidden canyons, the experiences that take real effort and pay back in full.

The Atacama is not just a destination for bus tours. It's one of the great trekking landscapes on Earth, if you know where to look.

Where is the Atacama and how do you get there

The Atacama Desert spans roughly 1,600 kilometers along the Pacific coast of South America, covering parts of northern Chile, Peru, Bolivia, and Argentina. The Chilean portion, the most visited and most accessible, is centered on the town of San Pedro de Atacama, a small adobe settlement at 2,400 meters elevation in the Antofagasta Region.

San Pedro is the base for virtually every trekking adventure in the region. It's small enough to walk across in ten minutes, and it has everything you need: gear shops, guides, altitude acclimatization time, and a strong network of local operators who have been running trips into the desert for decades.

Getting to San Pedro de Atacama:

The nearest airport is Calama (CJC), about 100 kilometers from San Pedro. Direct flights connect Calama to Santiago (approximately 2 hours), and several operators run shared transfers between the airport and town. From Santiago, the transfer by shuttle takes roughly 90 minutes.

If you're coming from Bolivia or Argentina, crossing by land through the altiplano is an adventure in itself, particularly the route through the Bolivian salt flat (Salar de Uyuni) and into Chile via Hito Cajón.

Understanding Atacama trekking: terrain, altitude, and conditions

Before you plan routes, you need to understand what kind of environment you're entering. The Atacama is not like other deserts.

Altitude is your primary challenge. San Pedro sits at 2,400m. Many of the most rewarding treks, the geyser fields, high-altitude lakes, and volcanic summits, take you above 4,000m and in some cases above 5,000m. Altitude sickness (soroche) is a real risk for anyone who hasn't acclimatized. Plan at least two full days in San Pedro before attempting anything strenuous above 4,000m. Stay hydrated, avoid alcohol on arrival, and take it slow.

The terrain is extraordinarily varied. In the space of 50 kilometers you can move from salt flat to volcanic desert to high lagoon to canyon carved by ancient rivers. Each zone demands different gear and preparation.

The climate is extreme but predictable. Days are typically sunny and warm, 20–25°C in summer (December–February), cooler in winter (June–August). Nights drop sharply: expect 5°C in summer at altitude, well below zero in winter. Rain is almost nonexistent except during the "Bolivian winter" (January–February), when afternoon thunderstorms are possible at altitude.

Sun protection is non-negotiable. The UV index in the Atacama is among the highest in the world. At 4,000m with thin, dry air and reflective salt and sand, SPF 50+ is minimum. Apply constantly.

The best trekking routes in the Atacama

1. Valle de la Luna (Moon Valley) — Half Day

This is the gateway trek, accessible, dramatic, and genuinely alien. Valle de la Luna sits just 15 kilometers from San Pedro and is usually done as an afternoon walk into evening, timed to watch sunset from the dunes that overlook the valley.

The landscape was formed by millions of years of salt and gypsum deposition, then sculpted by wind and the rare flash flood. The result is a bleached, creviced terrain that looks like something from another planet. Walking through the valley, you'll pass salt caves, wind-carved arches, and crystalline formations that catch the late light in extraordinary ways.

Distance: 8–12 km depending on route
Altitude: 2,400–2,500m
Difficulty: Easy
Best time: Late afternoon for sunset
Guide required: Not mandatory but recommended for context

2. Quebrada del Diablo (Devil's Gorge) — Full Day

Lesser-known than Valle de la Luna, the Quebrada del Diablo offers a deeper canyon experience with fewer crowds and more demanding terrain. The route winds through a narrow gorge carved by ancient water, with walls that shift from terracotta to violet depending on the angle of the sun.

This trek is better with a guide, the route is not always marked and some sections require route-finding across loose scree. What you get in return: genuine solitude in one of the most visually striking landscapes in the Atacama.

Distance: 12–15 km
Altitude: 2,400–2,700m
Difficulty: Moderate
Guide: Strongly recommended

3. Volcán Licancabur — Summit Trek (2 Days)

Licancabur is the sentinel of the Atacama, a perfect volcanic cone rising to 5,916 meters that dominates the skyline east of San Pedro. It marks the border between Chile and Bolivia, and its crater holds one of the highest lakes in the world.

This is not a casual trek. The summit requires serious acclimatization (minimum 5–7 days above 3,000m is strongly advised), good physical fitness, and a licensed guide. The route starts at Laguna Verde on the Bolivian side or from the Chilean base, climbing volcanic scree at altitude for 5–7 hours to the rim.

The reward: a crater lake that Inca priests may have used for rituals, a 360-degree view spanning the driest desert on Earth and the Bolivian altiplano, and the particular satisfaction of reaching a summit that demands real work.

Altitude: 5,916m
Difficulty: Hard to very hard
Duration: 2 days with high camp
Guide: Mandatory (licensed Atacama guides only)
Season: Best from October to April; avoid Bolivian winter storms (January–February)

4. Laguna Miscanti and Miñiques — High Altitude Lakes (Full Day)

At 4,200 meters, the twin volcanic lakes of Miscanti and Miñiques are among the most visually striking destinations in the Atacama. The water is an impossible turquoise, the surrounding peaks are snow-capped much of the year, and flamingos — Andean, Chilean, and James's species, wade along the shallow edges.

Most visitors arrive by vehicle. The proper way to experience it is on foot: a trail circuits both lakes, passing through high-altitude grassland (puna) where vicuñas graze and Andean foxes hunt in broad daylight. The views down to the salt flat and back up to the volcanic crests are among the finest in the region.

Distance: 10–14 km circuit
Altitude: 4,100–4,300m
Difficulty: Moderate at altitude
Guide: Not required but useful for wildlife identification

5. Tatio Geyser Field — Dawn Trek (Half Day)

The Tatio geyser field is the third-largest on Earth and sits at 4,500 meters, which makes it a genuine high-altitude adventure rather than a tourist attraction. Most visitors arrive at dawn by vehicle to catch the eruptions at their peak (they slow significantly once the sun warms the air).

The active experience: walking the geyser field as columns of steam shoot 10 meters into the sub-zero dawn air, ground thermal enough to melt your boots if you step in the wrong place, and, if conditions align, the option to soak in a thermal pool as the geysers fire around you.

Operators who go beyond the standard visit can combine Tatio with a full-day trek following the geothermal field north through high puna grassland, encountering flamingo lagoons and rarely-visited thermal streams.

Altitude: 4,500m
Distance: 5–20 km depending on extension
Best time: Arrive at first light (5–6am)
Guide: Required for extended treks

6. Atacama Crossing — Multi-Day Expedition (4–6 Days)

For serious trekkers, the Atacama offers multi-day routes that connect the salt flat, the high puna, the volcanic zone, and the canyon systems in a continuous journey. These are not marked trails or packaged itineraries, they're custom expeditions organized by local operators who know the terrain.

A typical 5-day route might move from the edges of the Salar de Atacama (salt flat) north through the Vado del Río Putana valley, up into the altiplano around Laguna Colorada, across to the Tatio geyser zone, and back down through canyon systems to San Pedro. Distances of 15–25 km per day, camping at altitude, with mule support for gear on the harder sections.

This is the Atacama that most travelers never see. It requires proper fitness, full gear, and a specialist operator. It's worth every bit of the effort.

Wildlife in the Atacama desert

The Atacama looks lifeless. It isn't. Learning to spot the animals that live here changes the entire character of a trek.

Flamingos: Three species are resident in the salt lakes and lagoons of the altiplano, Andean, Chilean, and James's flamingos. The James's flamingo is the rarest of the three and is predominantly found above 4,000m. Look for them at Laguna Chaxa (Salar de Atacama), Laguna Miscanti, and Laguna Colorada.

Vicuñas: The wild ancestor of the alpaca, vicuñas move in small herds across the high puna grassland above 3,800m. They're fast, shy, and beautiful. Dawn is the best time to spot them before heat haze distorts the distance.

Andean foxes: More curious than shy, Andean foxes are regularly spotted around the Tatio geyser field and high-altitude campsites. They've learned that humans occasionally drop food.

Vizcachas: A rabbit-sized chinchilla relative, vizcachas live in rocky outcrops throughout the Atacama. They look absurdly comfortable in terrain that would challenge most animals.

Birds: The Atacama's bird list is exceptional for a desert environment, puna ibis, giant coot, Andean goose, various hummingbird species, and the magnificent Andean condor soaring on thermal columns above the volcanic flanks.

Atacama stargazing: the world's best night skies

The Atacama is the home of some of the most powerful telescopes on Earth, ALMA, the VLT, the future Extremely Large Telescope, and they're here because the sky above the Atacama is uniquely clean. The altitude, aridity, and minimal light pollution combine to produce skies that are beyond anything most travelers have ever seen.

Several operators in San Pedro run dedicated astronomy experiences, ranging from telescope-guided tours to guided camps in the desert away from any ambient light. For trekkers, the practical implication is simple: camp in the desert or the high puna, and your evenings will be extraordinary. The Milky Way is not a faint smear here, it's a structure, dense and three-dimensional, stretching from horizon to horizon.

If you have the option, plan at least one night camping at altitude. It changes the Atacama from a place you visit into a place you inhabit.

When to go: Atacama trekking seasons

October–November (shoulder season, excellent): Days warm but not hot, nights cold at altitude, skies reliably clear. Fewer crowds than summer. Ideal for high-altitude routes.

December–February (summer): Peak season. Days are warm, the high puna lagoons are full, and flamingos are at maximum numbers. Bolivian winter storms can bring afternoon lightning above 4,000m in January and February, plan your summit attempts for mornings.

March–April (shoulder season, excellent): Similar to October–November. Crowds drop sharply after January. Good for most routes.

May–August (winter): Cold nights (below -10°C at altitude), but clear skies and minimal crowds. Summit routes require more care and the right gear. Not the standard season, but experienced trekkers who are well-equipped find the winter Atacama deeply rewarding.

What to pack for Atacama trekking

The Atacama punishes under-preparation and rewards good gear. The key items:

Layering system: Mornings start cold (5–10°C in summer at altitude, below zero in winter). Afternoons warm quickly. Evenings drop fast. You need to be able to add and remove layers constantly.

• Base layer: synthetic or merino wool (no cotton)
• Mid layer: fleece or light down
• Outer layer: windproof shell (waterproof for Bolivian winter months)

Sun protection:

• SPF 50+ sunscreen (apply every 2 hours)
• UPF 50+ sun hat with full brim
• UV-blocking sunglasses (the glare off salt flats can damage eyes without protection)
• Sun gloves if doing summits

Footwear:

• Sturdy hiking boots with ankle support for rocky and volcanic terrain
• Gaiters for salt flat edges where the crystals are sharp

Hydration:

• Minimum 3 liters capacity
• Hydration bladder or bottles that won't freeze at altitude
• Electrolyte tablets — dehydration happens faster than you expect at altitude

Altitude:

• Diamox (acetazolamide) if your doctor approves — effective prophylactic for altitude sickness
• Know the symptoms: headache, nausea, dizziness, loss of appetite. Descend if symptoms worsen.

Choosing an operator in San Pedro de atacama

The quality difference between Atacama operators is significant. The best local operators have years of experience running routes that go well beyond the standard package tours, with guides who have the botanical, geological, and astronomical knowledge to transform what you see into what you understand.

When evaluating an operator, ask specifically:

• Do they offer custom multi-day routes, or only standard day trips?
• What is their guide-to-client ratio on high-altitude routes?
• Are their guides licensed for summit trekking above 5,000m?
• What emergency protocols do they have for altitude sickness?
• Do they carry supplemental oxygen and satellite communication?

The difference between a good day and a bad one in the Atacama often comes down to guide quality. Invest accordingly.

Practical information for Atacama trekkers

Base: San Pedro de Atacama is the only real base for trekking in the region. Everything else is a transit point or a camp.

Permits: Most trekking in the Atacama does not require individual permits, but access to CONAF-managed areas (including Los Flamencos National Reserve, which covers the main lagoon areas) requires an entrance fee paid at the gate or arranged through your operator.

Currency: Chilean pesos are essential in San Pedro. ATMs exist but can run out on busy weekends. Bring cash from Calama or Santiago.

Language: Spanish is spoken throughout. English is understood by most operators in San Pedro but not by guides in the field. Basic Spanish phrases go a long way.

Emergency services: The nearest full-service hospital is in Calama. San Pedro has a clinic (SAPU) for minor issues and altitude-related problems. Every serious operator carries a first aid kit and has protocols for mountain emergencies.

Entry requirements: Chile currently requires no visa for most Western passport holders. Check current requirements before departure.

Why the Atacama belongs on your bucket list

There are deserts, and then there's the Atacama. It is not just the driest, some corners of it haven't seen measurable rainfall in recorded history. It is not just dramatic, its combination of volcanic peaks, salt flats, geothermal fields, and flamingo lagoons is unique on Earth. It is not just remote, it's genuinely, profoundly, otherworldly in a way that photographs never quite capture.

Trekkers who come here expecting a standard desert experience leave changed. The altitude forces you to slow down. The silence, actual, complete silence, unpolluted by wind or insect or animal sound, is something most of us have never experienced. The night sky is a revelation. And the feeling of covering ground on foot in a landscape this ancient and this extreme is something that sticks.

The Atacama is not a destination you visit once and check off. It's a place you return to, looking for more.

Ready to trek the Atacama? Outer Experiences connects you with the best local operators running multi-day expeditions, summit routes, and custom itineraries across the driest desert on Earth. Find local hosts for your Atacama adventures →

*Cover photo of National Geographic