FAQ: How Cold Should an Ice Bath Be?

Sep 10

3 min read

An ice bath does not need to be painfully cold to create a meaningful cold stimulus.

For many people, 10–15°C is a sensible starting range. More experienced cold plungers may choose 5–10°C, but colder is not automatically better. The right temperature depends on your experience, the length of the immersion, your body composition and what you hope to get from it.

At Float Well, our ice bath is usually set to approximately 7°C. Because this is at the colder end of the range, we encourage short, controlled immersions rather than treating endurance as the goal.

A tattooed arm resting on the edge of an ice bath.

What is the ideal ice bath temperature?

There is no single temperature that is ideal for everyone.

Research into cold-water immersion has tested a wide range of temperatures and exposure times. A 2025 network meta-analysis of post-exercise cold-water immersion found that:

Immersions of 10–15 minutes at 5–10°C ranked well for certain biochemical and neuromuscular recovery measures.
Immersions of 10–15 minutes at 11–15°C ranked well for reducing delayed muscle soreness.

These were athletic recovery studies, however. They should not be read as a recommendation that a beginner needs to spend 10 or 15 minutes in a 7°C ice bath.

For a recreational cold plunge or a contrast therapy session, a shorter exposure can still feel significant. Temperature and time work together: the colder the water, the less time you are likely to need.

Is a colder ice bath more effective?

Not necessarily.

Water below 10°C creates a stronger cold stimulus, but it also makes calm breathing and a controlled response more difficult. Going colder may simply make the experience more stressful without producing a better result.

A recent systematic review of cold-water immersion and health found that studies used water temperatures ranging from approximately 7–15°C, with widely varying exposure times. The authors found some promising results relating to stress, sleep and quality of life, but also noted that the evidence remains limited and that an optimal protocol has not yet been established.

The practical answer is to choose a temperature at which you can remain deliberate, breathe steadily and leave the bath safely. An ice bath is not a test of toughness.

A woman smiling submerged in a cold plunge tub with an infrared sauna behind her.

Should women use a warmer ice bath than men?

Claims that women should always use warmer water have become popular, but the research does not support a universal temperature based on sex. Women remain underrepresented in cold-water immersion studies, and a study comparing men and women found that differences in cooling were strongly influenced by body composition.

A separate small study examining menstrual-cycle phases found no significant difference in thermosensitivity between phases. More research is needed, so temperature and duration are best adjusted to the individual. If the cold feels unusually intense on a particular day, choosing warmer water or a shorter immersion is a sensible response.

How long should you stay in an ice bath?

Duration should reflect the temperature and your experience.

At approximately 7°C, a first-time cold plunger might begin with a brief immersion of around 30–60 seconds, concentrating on slowing the breath rather than staying in for as long as possible. You can leave sooner if your breathing remains uncontrolled or the experience feels overwhelming.

Someone accustomed to cold water may choose a longer immersion or repeat several short rounds during a contrast therapy session. More time is not automatically more beneficial.

If your goal is athletic recovery, your ideal protocol may also depend on the type of training you have completed and how soon you need to perform again. A professional recovery protocol should not automatically be copied into a general wellbeing session.

What temperature do we use at Float Well?

Our ice bath is normally set to approximately 7°C, although the temperature can be adjusted by our staff.

During a private Contrast Therapy session, you move between our infrared sauna and ice bath at your own pace. You decide how many rounds to complete and how long to spend in each. Our team can help you choose a manageable starting point based on your experience and comfort.

The aim is not to conquer the cold. It is to meet it calmly, notice your response and emerge feeling more present than when you arrived.

A woman getting into an ice bath in a private contrast therapy room. Another woman is sitting in an infrared sauna next to the cold plunge.

A few cold-plunge safety essentials

Cold water can produce an immediate gasp response, faster breathing and changes in heart rate and blood pressure. These are recognised features of the body’s cold-shock response.

To approach an ice bath more safely:

Enter steadily rather than jumping or diving.
Keep your head above water.
Do not practise prolonged breath-holding in the bath.
Leave the water if you feel dizzy, faint, confused, numb or unable to control your breathing.
At Float Well, Contrast Therapy is not available to customers who are pregnant or have a cardiovascular, blood-pressure or circulatory condition.

If you’re looking for a private ice bath in Wellington, you can book a 30- or 60-minute Contrast Therapy session at Float Well.