The highest geyser field in the southern hemisphere
El Tatio is a geothermal field at 4,320 metres above sea level, in the Andes of the Antofagasta region. With dozens of geysers, fumaroles and pools of boiling water, it is the largest geyser field in the southern hemisphere and one of the largest in the world. Its name comes from Kunza, the language of the Atacameño people, and the site remains important to local communities: since 2014, the Atacameño communities of Toconce and Caspana have managed it under a concession from Chile's Ministry of National Assets, and they are the ones who collect the entrance fee and run the on-site services (parking, toilets, first aid and changing rooms).
Why you have to leave before dawn
Visits to El Tatio almost always happen at sunrise, and not on a whim. The water comes out of the ground at over 85 °C and, when the air is below freezing, the steam condenses into white columns that can reach several metres high. As the sun rises and the air warms up, the steam becomes almost invisible. The best window is roughly between 5:00 and 7:30 am, which is why tours leave San Pedro between 4:00 and 5:00 am.
The drive from San Pedro is about 90 km and takes around an hour and a half to two hours, largely on a gravel road that climbs from the town's 2,400 metres to over 4,300. You can go in your own vehicle, but that means driving at night, in intense cold and at high altitude, on a road that does not forgive mistakes. That is why the vast majority of visitors join a guided tour, which also takes care of breakfast and explains the site.
Altitude: the key point
Going from 2,400 to 4,320 metres in a few hours affects many people. Typical symptoms of altitude sickness, known locally as puna, are headache, dizziness, nausea and fatigue. Some practical advice:
- Do El Tatio after two or three days in San Pedro, not on your arrival day.
- Drink plenty of water the day before and during the tour.
- Avoid alcohol and heavy meals the night before.
- Walk slowly once up there and tell your guide if you feel unwell.
The visit is discouraged or not allowed for pregnant women, and people with heart problems or uncontrolled high blood pressure should check with their doctor before going. Operators usually set a minimum age for children; ask when booking.
Safety on the geothermal field
The ground around the geysers can be a thin crust over boiling water, and visitors have suffered serious burns after stepping off the path. The rules are simple: walk only on the marked trails or where your guide indicates, keep your distance from the pools and do not get close to the vents for a photo. Do not leave litter or disturb the plants and wildlife either.
What the tour is like
A typical tour combines several parts:
- Arrival at the geyser field at first light and a guided walk through the main sectors.
- Breakfast on site, often prepared by the guide right next to the vehicle.
- Depending on the tour and conditions, a dip in a thermal pool in the area, for those brave enough to change clothes in sub-zero temperatures.
- The return along the Putana river and its wetlands, where vicuñas and Andean birds are commonly seen and, with luck, viscachas among the rocks.
- A stop in Machuca, a tiny village of adobe houses with thatched roofs and its own church, at around 4,000 metres.
The full tour lasts about 6 to 7 hours, getting back to San Pedro mid-morning or around midday, with time to rest before an afternoon activity. You can browse the full-day tours in San Pedro de Atacama to compare routes and timings.
Best time to go
El Tatio can be visited all year. In winter (June to August) it is colder and the steam is usually more spectacular, although sunrise temperatures can drop well below zero and snow can make the road difficult. In summer, the so-called Altiplanic winter, roughly between January and March, brings afternoon storms that sometimes affect high-altitude routes. In any month, the puna weather changes quickly: local guides know whether the road is open and adjust departure times to the season.
What to bring
- Properly warm clothing: a thermal base layer, fleece, a down or insulated jacket, hat, gloves and thick socks. It is below freezing at sunrise.
- Closed shoes with a good sole.
- Sunglasses and sunscreen: once the sun is up, radiation at this altitude is very strong.
- Water and a snack, even though breakfast is usually included.
- Swimwear and a towel if the tour includes the thermal pool.
- ID and cash for the entrance fee if it is not included.
Many people dress in layers and peel them off as the day warms up; back in San Pedro at midday, it can be hot.
Entrance fee and bookings
The entrance fee is paid separately at the gate, to the community administration, unless your tour includes it. The amount changes from time to time, so check it before you go. Group tours can be booked one or two days in advance outside high season; during the summer and winter holidays or long weekends, it is better to book earlier. Choose operators registered with Sernatur, Chile's national tourism service.
Local guides in San Pedro de Atacama
On Trekonda you can browse the local guides in San Pedro de Atacama and contact them directly, with no intermediary commission. Ask about departure and return times, whether the entrance fee and breakfast are included, the group size, the guide's languages and whether the vehicle carries oxygen or a first-aid kit for the altitude.
Frequently asked questions
What time do El Tatio tours leave?
Usually between 4:00 and 5:00 am from San Pedro, to arrive at sunrise.
How cold is it?
At sunrise the temperature is usually below freezing, and in winter it can drop much further. Once the sun is up it warms quickly.
Is the altitude dangerous?
For most people it is not, if they acclimatise for two or three days in San Pedro before going up. Pregnant women and people with heart problems should avoid it or ask their doctor.
Can I combine it with another activity the same day?
Yes. Since you are back by mid-morning, many people do an afternoon activity such as the Valle de la Luna. Check the full-day tours to plan your days.