Ice, Ice, Baby: Why everyone should try ice swimming

Every winter, hundreds of thousands of Finns cut holes in frozen lakes and lower themselves into water that is just above freezing. They do this on purpose. Many do it before work.

Finland has a long and serious relationship with cold water. It is part of the same culture that produced one of the world's great bathing traditions, and you cannot understand one without the other. The ice and the sauna are two halves of the same thing.

What is avantouinti and where does it happen

Avantouinti is the Finnish word for ice swimming. Avanto means a hole cut in the ice. Uinti means swimming. Put them together and you have a word for something that requires a chainsaw, a rope and a reasonable tolerance for discomfort.

The avanto is usually a rectangular hole, roughly large enough for two or three people to enter the water at once. It is maintained by a club, a municipality, or a determined private individual who owns lakefront property. The edges are kept clear of ice. There is usually a ladder. There is almost always a sauna nearby.

You find avantos at dedicated winter swimming clubs in Helsinki, Tampere, Turku and most other Finnish cities. Some are elaborate facilities with dressing rooms, heated viewing areas and a full sauna complex. Others are a wooden hut on the edge of a lake with a hole chopped through the ice and a handwritten sign saying the sauna is ready at six.

There are over 150 registered winter swimming clubs in Finland. The tradition goes back at least to the early twentieth century as an organized activity, though Finns had been using cold water as part of post-sauna ritual long before anyone thought to form a club around it. The oldest clubs have thousands of members. Waiting lists are not unusual.

The ritual: what actually happens

The sequence matters. You do not walk outside and get into the ice water. That is not how it works.

You start in the sauna. You heat yourself until you are properly warm, not just comfortable but genuinely hot, core temperature elevated, skin flushed. This takes time. Finns are not in a hurry in the sauna. Then you go to the avanto.

The entry is controlled. You use the ladder. You go in slowly or you go in quickly, depending on your experience and personal philosophy. The shock is immediate. Your body responds as though something is very wrong. Your breathing becomes sharp and involuntary. Your skin burns. Everything tightens.

You stay in for one minute, maybe two. Experienced swimmers stay longer. You do not need to stay long. The effect is already happening.

Then you get out, return to the sauna, and warm up again. You can repeat the cycle two or three times. After the final warm-up, you sit with a cup of coffee and feel something that is difficult to describe accurately to someone who has not felt it.

The sauna and the ice are not opposites. They complete each other. You do not fully understand one without the other.

For those who have done both, there is merchandise.

What cold water does to your body

The immediate physical response to immersion in near-freezing water is not subtle. Your heart rate accelerates. Your blood vessels constrict rapidly to protect your core temperature. Cortisol and adrenaline spike. Your body treats this as an emergency, because by most ordinary measures it is one.

What happens after is more interesting. As you warm back up, the stress hormones drop. Norepinephrine levels, which rise sharply during cold exposure, remain elevated for some time afterward and are associated with improved focus and mood. Many regular ice swimmers describe a lasting calm that follows the initial shock. This is not wishful thinking. It is measurable.

Regular cold exposure has been linked to reduced inflammation, improved circulation and a stronger adaptive stress response over time. The body becomes more efficient at managing thermal shock. What feels unbearable the first time becomes merely sharp by the tenth. The health benefits of the full sauna and cold water ritual stack on top of each other. The contrast between extreme heat and extreme cold appears to amplify the circulatory effect of each individual component.

None of this requires you to stay in for ten minutes. One minute is enough to trigger the response. Two minutes makes your friends more impressed.

The mental dimension

Ice swimmers in Finland consistently describe the practice in terms that go beyond the physical. The word that comes up often is selkeys, which translates roughly as clarity. A clean mental slate. The sense that whatever was on your mind before you got in the water has been reorganised into something more manageable.

This is partly neurochemical and partly something harder to categorise. Cold water demands your full attention. You cannot be distracted in the avanto. Your phone is not there. Your to-do list is not there. There is only the cold and your own breathing. For many people this enforced presence is something they cannot get elsewhere.

Finnish winter is long and dark. The ice swimming season runs roughly from December through March in southern Finland and longer further north. Going into the water on a January morning when the air temperature is minus fifteen and the sky is a flat grey has a particular quality. It is not enjoyable in any conventional sense. It is, however, extremely effective at reminding you that you are alive.

The social side

Ice swimming in Finland is not a solitary pursuit. It is something people do together. The clubs exist not just for access to the avanto but for the community that forms around it. People swim on the same mornings each week. They warm up together in the sauna. They drink coffee afterward and talk about ordinary things.

The ritual creates a kind of levelling effect. Whatever your job or status, you are standing in the same cold water in the same state of involuntary gasping. The shared experience is the point. This is why visitors to Finland who try ice swimming often describe it as one of the most genuinely social things they have done in the country. The barriers that stay up in other contexts come down fairly quickly when everyone is cold and wearing very little.

Many clubs welcome visitors. You do not need to be a member to try. You do need to be reasonably healthy and willing to follow the instructions of whoever is there when you arrive.

How to start

You do not begin by cutting a hole in a lake alone. This is not a safe starting point.

The most sensible introduction is through an established club or venue that has professional supervision and a functioning sauna. Helsinki alone has several, including Allas Sea Pool and a number of club facilities around the city's shoreline. Most are accessible to non-members on a day visit basis.

On the practical side: wear something you can get on and off quickly. Bring a towel you can wrap around yourself immediately on exit. Bring sandals or something to protect your feet from the ice. Do not bring expectations about how long you will stay in, particularly the first time.

Start with thirty seconds. Get out when your body tells you to. Warm up completely before deciding whether to go again. Do not go alone if you are new to it. Do not go if you have heart conditions or other contraindications without medical advice.

The progression from one visit to a weekly habit happens faster than most people expect. The body adapts. The shock becomes manageable. The reason people keep coming back is not masochism. It is that the feeling after becomes something they structure their week around.

When the ice is ready

Finns have specific knowledge about ice conditions that most people outside the country do not develop. Safe ice for walking is considered to be at least five centimetres thick. For an avanto to function, the surrounding ice needs to be stable enough to stand on while entering and exiting the water. This usually means late December at the earliest in southern Finland, though the season has been shifting with warmer winters.

The clubs monitor this. They open their avantos when the ice is ready and maintain them through the season. The avanto itself is kept from freezing over, usually through regular use and sometimes with a small pump or heater at the edges. A neglected avanto ices over quickly in serious cold.

In northern Finland and Lapland, the season is longer and more reliable. Rovaniemi, Oulu and similar cities often have solid ice conditions from November through April. Some enthusiasts travel north specifically for the longer season and the quality of the darkness.

Frequently asked questions

Is ice swimming dangerous?
For healthy adults who follow basic precautions, it carries manageable risk. The main risks are cold shock on entry, which can cause involuntary gasping and sudden changes in heart rate, and hypothermia from staying in too long. Both are avoided by using supervised facilities, limiting time in the water and ensuring you are fully warm before and after. People with cardiovascular conditions should consult a doctor first.

Do you have to go in the sauna first?
You do not have to. But Finns do. The sauna-to-ice sequence is the traditional approach and it makes the experience significantly more manageable. Going into cold water when you are already warm means your body has resources to spend on the response. Going in cold from the start is harder and less rewarding.

How cold is the water?
In winter, Finnish lake and sea water is typically between zero and four degrees Celsius. The water temperature stays fairly stable once the ice has formed. It does not get much colder than this because water freezes before it does. It does not need to be colder. It is sufficient.

Can tourists try ice swimming in Finland?
Yes. Many clubs and commercial facilities welcome visitors. Allas Sea Pool in Helsinki is accessible without club membership. There are also guided experiences available in various cities, particularly in Lapland where it is marketed as part of winter tourism packages. You do not need to understand Finnish to participate. You just need to be able to follow a ladder into water.

How often do regular ice swimmers go?
This varies. Some go daily, before work or after. Others go two or three times a week. The clubs tend to have regular morning slots with consistent groups of people. Once the habit forms it is reportedly difficult to give up, partly because of how the post-swim state feels and partly because the social routine becomes something people value independently of the swimming itself.

The book that started as a list of observations about Finnish winter life. Ice swimming, sauna, darkness, coffee. The observations kept coming.

If you have been to Finland in winter and not gone in the ice, you have seen half of something. The sauna is one half. The avanto is the other. They were designed, over many centuries of dark winters, to work together. The only way to understand that is to do both.