Cold water exposure: cold showers and dips, done safely

Short cold showers or brief cold-water dips of a few minutes, used by many people for a morning lift in energy and focus, with clear limits for safety.

Research-informed

This page draws on published research and health authorities, listed under Sources at the end. How we rate pages

Time

3-10 min

Difficulty

Moderate

When

Morning

Goals

Energy
Focus

You need

Nothing needed

How to do it

At the end of your usual warm shower, turn the tap to cold.

Stay under the cold water for 30 seconds at first, then work up to 60 or 90 seconds over the following weeks.

Repeat each day if it suits you, keeping the cold part short.

For a plunge, check the water with a thermometer and aim for 50 to 59 F (10 to 15 C). Never go below 40 F (4 C).

As a beginner, stay in for one to two minutes, never more than five, and start with once or twice a week.

Get out at once if you feel light-headed, then dry off and warm up gradually.

Origin

Winter swimming and cold-water dips, long-standing customs in cold countries

The safest way to try cold water exposure is to end your normal warm shower with 30 to 90 seconds of cold water. A full cold plunge asks more of you: water you have measured with a thermometer, a strict time limit, and a check with your doctor first if you have certain health conditions.

Why people do it

Most people who take up cold showers or dips want a sharper start to the day. They describe the cold as a jolt that leaves them feeling more awake and focused, and many keep the habit as a morning ritual. If you are building a broader routine, our whole-person morning routine shows how a short cold finish can sit alongside movement and quiet time.

The practice is old. Winter swimming and cold-water dips have long been customs in cold countries, often done in groups and treated as a social occasion as much as a health habit. The modern cold plunge tub is a newer, home-friendly version of the same idea.

Cold water engages the body and the mind together. Your body reacts at once with a gasp, a faster heart rate and tingling skin. Your mind has to meet that reaction, settle the breath and stay with it for the full count. Many people find that this short, deliberate discomfort is a large part of the appeal.

What the evidence says

The research behind the popular claims about cold shower benefits is real but modest. In a 2016 randomized trial in the Netherlands in PLOS ONE, adults who ended their showers with cold water for 30 days reported less sickness absence from work, but they did not have fewer days of illness. A 2026 systematic review and meta-analysis in Frontiers in Physiology found that results generally leaned toward benefits for stress, well-being and mood. The uncertainty was wide, though, and most studies had a high risk of bias. Its authors said the evidence does not establish a mood benefit and that cold exposure should not be used on its own to treat psychiatric disorders. Harvard Health Publishing describes a separate analysis showing temporary drops in stress and slightly better sleep and quality of life, with little evidence for mood or immunity. It also notes there is no agreement on the best temperature, timing or duration.

Variations

Cold shower finish. End a warm shower with 30, 60 or 90 seconds of cold water. This is the gentlest entry point and suits most beginners.
Cold face splash. Splash cold water on your face at the sink. It takes seconds and suits people who are not ready for a full cold shower.
Cold plunge tub. Full cold water immersion in a tub at 50 to 59 F (10 to 15 C) for one to two minutes. This suits people who have already got used to cold showers and have checked their health with a clinician where needed.
Group winter swimming. Supervised open-water dips with an experienced group. This suits confident swimmers who will never go in alone and will wear a life jacket.

Common mistakes

Going too cold, too long, too soon. Keep the water at or above the beginner range and stay well inside the time limits in the steps above. Lengthen sessions slowly over weeks.
Plunging alone in open water. Cold shock can make even strong swimmers gasp and struggle in calm water. Always go with others, and wear a life jacket.
Pushing through warning signs. Light-headedness or numbness means it is time to get out. Leave the water, dry off and warm up.
Rewarming with very hot water. A scalding shower straight after a plunge warms you too quickly. Use dry clothes, blankets and a warm room, and let your body come back up gradually.
Fighting the gasp. Panicked, rapid breathing makes the first minute harder. A steady pattern such as box breathing gives you something calm to focus on as you get in.

If you have heart disease or a heart rhythm problem, high blood pressure, diabetes, poor circulation, Raynaud’s or neuropathy, or you are pregnant, talk to a clinician before trying cold water exposure. You can find more body practices in the Body hub.

Take care

Avoid cold plunges if you have had heart disease, especially rhythm problems like atrial fibrillation, or have peripheral artery disease or Raynaud's.

Check with a clinician if you have high blood pressure, diabetes, neuropathy, poor circulation, venous stasis or cold agglutinin disease, or are pregnant.

Cold shock in the first two to three minutes causes gasping that raises drowning risk. Never plunge alone in open water, and wear a life jacket.

Core temperature can keep falling after you leave the water. Warm up gradually rather than with very hot water.

Questions people ask

How long should a cold shower be?

In the largest trial, people ended a warm shower with 30, 60 or 90 seconds of cold water every day for 30 days. Starting with about 30 seconds and building up from there is a sensible approach. For a full cold plunge, Cleveland Clinic suggests that beginners stay in for one to two minutes and never longer than five.

Are cold plunges safe for everyone?

No. Cleveland Clinic advises talking to a clinician first if you have heart disease, high blood pressure, diabetes, neuropathy or poor circulation, or if you are pregnant. Harvard Health Publishing says people with past heart disease, especially rhythm problems, peripheral artery disease or Raynaud's should avoid plunges, because cold shock raises heart rate and blood pressure. In open water, cold shock also causes gasping that raises the risk of drowning.

Do cold showers help with mood?

The evidence is uncertain. A recent meta-analysis found results that generally leaned toward benefits for stress, well-being and mood, but with wide uncertainty and mostly high risk of bias. Its authors said the evidence does not establish a mood benefit, and that cold exposure should not replace treatment for psychiatric disorders. Harvard Health Publishing describes temporary drops in stress but little evidence for mood.