How to take an ice bath at home: temperature, time and safety

How to take an ice bath, step by step

The method is simple once you know the order, and the safety details matter more than the temperature. If you have bought or are about to buy a portable ice bath, this is the whole routine:

1. Fill the tub with cold tap water, add ice and stir, then check the temperature with a thermometer and aim for the range in the box below.

2. Have someone else in the house or garden, and get your towel and warm, dry clothes ready before you get in.

3. Enter slowly, feet and legs first, and breathe out steadily through the first cold-shock gasp.

4. Stay in for your planned time, keeping still and keeping your breathing slow.

5. Get out, dry off, dress, and warm up gradually.

The rest of this guide takes each of those steps in turn: how cold, how long, how much ice, how to handle the shock of getting in, and how to warm up safely afterwards. It sits within our wider cold water therapy guides, and it is the cold half of the hot-then-cold ritual if you are also using a sauna.

Getting ready: kit, water and a plan

Most people start with an inflatable or portable ice bath filled with cold tap water and topped up with ice. In a British winter the mains water is often already cool, so you may need less ice than you think. A cold plunge tub holds its temperature for longer, and an ice bath chiller cools and filters the water so you can set a temperature and skip the ice entirely.

Whatever you use, get three things ready before you fill it: a thermometer so you are measuring the temperature rather than guessing, a warm change of clothes and a towel within reach, and someone who knows you are getting in. Plan how you will get out and where you will warm up. This preparation is not optional padding, it is the safety plan, and it matters most the first few times.

How cold should the water be?

Cold, but not as cold as you can bear. An ice bath needs to be genuinely cold to do anything, but colder is not better. For easing muscle soreness, the research points to a moderate cold band, and water below that gave weaker results, not stronger. Twenty minutes in very cold water actually performed worse than doing nothing at all.

Start at the warmer end of the cold range and work down slowly over weeks as your body adapts. There is no prize for a colder number, and pushing the temperature down too fast only makes the cold-shock response harder to control. The exact ranges to aim for are in the box below.

How long should you stay in?

Start short and build up. First-timers should keep it brief, measured in a couple of minutes rather than aiming for a target. As you get used to it you can extend the time gradually, but there is a sensible ceiling beyond which you gain nothing and raise your risk of hypothermia and cold injury. Longer and colder is not more effective, so treat the upper limit as a hard stop rather than a challenge.

The temperature and time to work to

Here are the ranges to work to for temperature, duration and how often. Treat them as a sensible starting point tied to the evidence, not as targets to beat.

How much ice do you need?

There is no universal figure, and any guide that gives you a fixed number of kilograms is guessing. The amount of ice depends on your starting water temperature, the volume of your tub and the temperature you are aiming for. A modest cool-down might take a couple of bags; a deep, very cold plunge can take a great deal more.

The reliable method is to stop counting bags and start measuring. Fill the tub with cold water, add ice, stir it through, and check the temperature with a thermometer. Add more ice if you need to and stir again. Once you know roughly how much ice your tub and your tap water need to hit your target, you can repeat it. If you are doing this several times a week, an ice bath chiller removes the ice-and-refill hassle altogether, sets the temperature for you and filters the water to keep it clean.

Getting in: controlling the cold-shock gasp

The hardest and most dangerous moment is the first few seconds. Dropping quickly into cold water triggers the cold-shock response: an involuntary gasp, rapid breathing that can run several times faster than normal, and a sharp spike in heart rate and blood pressure. RoSPA warns that this surge can cause a heart attack even in people who are in good health. This is why how you get in matters more than how cold the water is.

Get in slowly, feet and legs first, and never dive or dunk your head straight away. As the cold hits, resist the urge to gasp and gulp: breathe out long and slow, and keep your breathing under control. The worst of the shock passes within the first minute or so if you stay calm and keep still. If your breathing will not settle, or you feel light-headed or your hands stop working properly, get out. That is the moment the person you have with you is there for.

Warming up afterwards

How you warm up is part of the method, not an afterthought. Get out, dry off quickly, put on warm dry clothes and move around gently. A warm (not scalding) drink helps.

Be careful with a hot shower. As you rewarm, cold blood from your arms and legs returns to your core, so you can keep cooling and actually feel coldest a few minutes after you get out. This is called afterdrop. Jumping straight into a very hot shower or bath can make it worse and leave you feeling faint or light-headed. Favour gradual, passive rewarming: dry clothes, gentle movement and a warm drink, and save the hot shower until you have warmed up naturally.

How often should you take one?

There is no strong evidence base for an ideal frequency, so the sensible approach is to start with once or twice a week and build gradually as you get comfortable. The frequency to aim for is in the box above.

There is one important exception. If your goal is building muscle, be careful about ice bathing on the same day you lift, which brings us to the trade-off worth knowing.

Should you ice bath after a workout?

Not straight after strength training, if building muscle is your aim. Cold water immersion in the hours immediately after resistance training blunts the long-term gains in muscle size and strength. In a controlled study, active recovery beat ten minutes of cold immersion for strength and muscle-fibre gains over twelve weeks, and a 2024 meta-analysis reached the same conclusion for muscle growth.

Cold immersion straight after lifting can work against muscle growth, so time it for rest days or several hours later.

The practical rule: if hypertrophy is the goal, leave the ice bath for rest days, for several hours after lifting, or for after endurance and skills sessions instead. If you are chasing recovery from a hard endurance day or general soreness rather than muscle growth, the timing matters less.

Common mistakes to avoid

• Going too cold, too soon. Colder is not better, and it makes the cold shock harder to handle. Start warmer and work down.

• Staying in too long. Past the sensible ceiling you add risk, not benefit.

• Rushing in or dunking your head. This is what triggers the worst of the cold-shock response.

• Immersing alone. Always have someone present, especially early on.

• Jumping into a hot shower straight after. This can worsen afterdrop and leave you faint.

• Ice bathing straight after lifting when you are training for muscle size.

• Chasing a number instead of measuring. Use a thermometer rather than counting bags of ice.

Do you need a chiller, or is ice enough?

Ice is the low-cost way in and works perfectly well, especially if you are doing this once or twice a week. Bagged supermarket ice is roughly £1 to £2 for a 2kg bag, so a very cold, ice-only session can cost several pounds each time, and the cost and faff add up if you plunge often.

An ice bath chiller is the repeatable route: it cools and holds the water at a set temperature, filters it to keep it clean, and removes the ice entirely. A domestic chiller drawing around 0.5 to 1 kW costs roughly 12 to 25p per hour of active cooling at an electricity rate of about 25p per kWh (power in kW multiplied by hours multiplied by the unit rate). Over months of regular use, that is the practical argument for a chiller over bagged ice. If you are only trying cold immersion occasionally, ice is fine and a cold plunge tub or portable bath will do the job.

Guide prices, correct as of July 2026, based on an electricity rate of around 25p per kWh. The Ofgem energy price cap changes quarterly, so check current rates before budgeting. Guide prices are typical UK costs, not live prices.