How cold should
an ice bath be?

Published 18 August 2026 · All guides

The short answer

If you are starting out, somewhere around 12–15°C is a sensible place to begin. Once you are comfortable there and can control your breathing, many people settle somewhere in the region of 8–12°C for regular use.

There is no single correct number. The right temperature is the one that is genuinely challenging, that you can breathe calmly in, and that you will actually keep using.

Start warmer than you think

The instinct is to go as cold as possible immediately. It is the wrong instinct.

The first thing cold water does is trigger a sharp involuntary gasp and a jump in breathing rate. That response is normal, but it is also the part that catches people out, and it is stronger the colder the water. Starting at a more moderate temperature lets you learn to settle your breathing in a situation where there is less to manage.

Once getting in no longer makes you gasp, you have earned the right to go colder.

Working down over time

Drop the temperature gradually, a degree or two at a time, and only once the current setting feels manageable rather than merely survivable.

With a chiller-equipped tub this is straightforward: set the temperature and it holds it. Worth knowing that temperature changes happen gradually over several hours rather than instantly, so adjust it the day before rather than expecting it on demand.

How long to stay in

Most beginners start at one to two minutes. Experienced users often sit somewhere between three and five.

Long sessions are not the goal. Regular short exposures do more than occasional heroic ones, and the marginal value of minute six is small compared with the added risk. Several sessions a week at a sensible duration beats one long ordeal.

Get out immediately if you feel dizzy, faint, confused, unusually breathless or lose the ability to control your breathing. Numbness that stops being uncomfortable and starts being absent is also a signal to get out.

Why colder is not automatically better

Past a certain point, lowering the temperature mainly adds difficulty. It does not proportionally add benefit, and it does raise the risk, particularly of the initial cold shock response.

There is also a practical argument. A tub at a temperature you quietly dread is a tub you stop using. One that is genuinely bracing but approachable on a dark morning in January is one that stays part of your routine. The best temperature is the one still being used in three months.

A few practical points

• Get in deliberately. Lower yourself in rather than jumping, and never dive.
• Keep your head above water.
• Breathe normally. Do not deliberately hyperventilate beforehand, and do not hold your breath underwater.
• Do not go in alone until you know how your body responds.
• Warm up gently afterwards. Dry off and put layers on; there is no need to rush into a hot shower.
• Never use it after drinking.

Who should not do this without advice

Cold water immersion is not suitable for everyone. Speak to your GP first if you have a heart condition, high or low blood pressure, breathing difficulties, a history of fainting, are pregnant, take medication relevant to cold exposure, or have any other condition that cold or sudden physical stress could affect.

More detail is in our guide to cold water therapy and the Water Care & Safe Use Guide.

Trying it without buying

A chiller-equipped tub lets you set a temperature and hold it, which is what makes gradual progression possible in the first place. If you would rather find out whether cold water suits you before committing to buying equipment, home hire starts at £180 a month with a two-month minimum.