El Tatio geysers: what the trip is like and how to prepare for 4,320 m

The El Tatio geysers are the highest geothermal field in the world, at 4,320 metres, with more than 80 active geysers. It is the most spectacular excursion in Atacama and also the most demanding: it leaves before dawn, the cold is below freezing, and the altitude is real. This guide covers what the trip is like and how to prepare.

Why does the tour leave before dawn?

Because the fumaroles are far stronger in the cold of sunrise. Once the sun is high, the steam loses definition and the spectacle is simply not the same. It is not an operator's whim: it is physics.

In practice, the transfer collects you from San Pedro hotels between 5:00 and 5:40am, the drive up takes about an hour and a half, and the tour ends back in San Pedro around midday, roughly seven and a half hours in total.

How cold does it get at El Tatio?

Very, and this is what catches most people out. At sunrise the temperature is below zero, and -5 °C or colder is not unusual. Then it climbs fast with the sun: by midday you are in a t-shirt.

That is why the rule is to dress in layers, not one heavy coat:

• A thermal base layer, top and bottom.
• A mid layer (fleece or similar).
• A windproof shell on top.
• Hat, gloves and thick socks. That is where the cold actually gets in.
• Closed shoes with good grip: the ground is uneven and there is ice.

How to prepare for 4,320 metres

This is what decides whether the trip is unforgettable or miserable:

• Do not go the day after you arrive. San Pedro is already at 2,400 m and El Tatio climbs almost two thousand metres higher. The advice is to wait two or three days, doing lower-altitude excursions first.
• Drink plenty of water in the days before and during the trip. Dehydration worsens every altitude symptom, and in the desert it arrives without thirst.
• Eat light the night before and skip the alcohol. It is the most common mistake.
• Walk slowly up there. Strolling between the fumaroles looks easy, but at 4,320 m any effort tells. If you feel a headache, nausea or shortness of breath, tell your guide.

Who should not do this trip

High-altitude excursions are not recommended for pregnant women, small children, or people with high blood pressure or heart conditions. If any of that applies, talk to a doctor before booking: it is not a formality.

What is included and what to bring

Tours normally include transport, a bilingual guide, breakfast on site and the entrance fee. What you bring yourself:

• Water, plenty of it.
• Sunscreen and sunglasses. Once the sun is up, radiation at 4,320 m is brutal.
• Swimwear and a towel, if the itinerary includes the hot springs.
• Cash for the entrance if it is not included, and for the village of Machuca on the way back.

Is it worth it?

It is, and it is the trip most people remember as the best of the journey. But it is honest to say: if you cannot acclimatise first, it is better to leave El Tatio out than to do it feeling terrible. The desert has other extraordinary excursions at far friendlier altitudes.