Ice Bath vs Cold Plunge: Is There a Difference? Tarzana Guide

Short answer: an ice bath and a cold plunge are the same idea, cold water up to your neck for a few minutes, done two different ways. An ice bath is a tub of water with bags of ice dumped in. A cold plunge is a purpose-built tub with a chiller and a filter that holds the water at a set temperature. The body does not care which one it is in. It responds to the temperature of the water and how long you stay, and that is where the two actually differ: an ice bath drifts and is often colder than you meant, a cold plunge sits at the number on the dial. This guide covers what the research supports for each, what to look for in a plunge near you, and how to do your first one safely at our Wellness Lounge in Tarzana.

What the words mean

There is no official definition that separates the two, and most retailers use the terms loosely. In practice the split is about equipment, not physiology.

• Ice bath: any tub, trough or stock tank filled with tap water and ice. No thermostat. The water can sit anywhere from the low 30s°F when the ice is fresh to the 50s°F twenty minutes later, and it warms as you sit in it. Cheap to set up, hard to repeat.
• Cold plunge: a tub with a refrigeration unit, a pump and a filter. You pick a temperature, usually somewhere between 39 and 60°F, and it holds. Most people settle in the low 50s. The water circulates through a filter and a sanitizer, which is the other practical difference.

Public-health guidance follows the same line. San Francisco's health department, one of the few that has written cold plunge rules, describes a cold plunge as a single-occupant tub typically below 59°F and asks operators to test and log chlorine and pH every day and to run the full volume of water through filtration and disinfection at least once an hour. A home ice bath has none of that, which is fine for one person at home and not fine for a shared tub at a gym.

Does colder mean better?

Not in the studies that have measured it. The best-known review of cold water immersion for sore muscles, Machado and colleagues in Sports Medicine in 2016, pooled the trials and found that water of 11 to 15°C (about 52 to 59°F) for 11 to 15 minutes did more for soreness than colder or shorter protocols. A 2025 network meta-analysis in Frontiers in Physiology that combined 55 randomized trials came to a similar place: 10 to 15 minutes at 11 to 15°C reduced delayed-onset soreness, with the 5 to 10°C range also effective. Nothing in either review rewards the 33°F ice bath over a plunge set in the 50s.

That matters because the ice bath is the one most likely to be too cold. When the water is near freezing, the first minute is dominated by the cold shock response, and most people get out before the exposure has done anything. A plunge held at 50 to 55°F lets you stay long enough for the time to count.

The first thirty seconds

Whichever tub you use, the body reacts the same way when cold water hits the skin. Professor Mike Tipton's group at the University of Portsmouth has described the cold shock response for decades: an involuntary gasp, a minute of fast breathing you cannot fully control, a jump in heart rate and blood pressure. It peaks in the first 30 seconds and settles over the next 60 to 90. The same work shows the response fades with practice. In one of their studies, five or six short immersions were enough to blunt the gasp and the breathing surge, and a follow-up found that adaptation still partly present seven to fourteen months later.

Two practical rules come straight from that physiology. Get in slowly and get your breathing under control before you let your shoulders drop under. And never put your face in during the first minute: the gasp reflex and a mouthful of water is how cold water hurts people, even strong swimmers. Shattock and Tipton's 2012 paper in the Journal of Physiology describes the conflict between the cold shock drive to breathe and the diving response that tries to hold the breath when the face is wet. Keep the head out and that conflict never starts.

What you can reasonably expect

Sore muscles are the best-supported use, as above. Beyond that the evidence is thinner than the marketing.

• Mood and alertness. A 2023 study in the journal Biology had 39 adults sit in cold water for five minutes and found they rated themselves more alert and active afterwards, with changes in brain network connectivity on imaging. Small study, one session, no temperature in the summary we could verify, so treat it as a lead rather than a result.
• Stress and sleep. A 2025 review in PLOS One pooled 11 randomized trials with 3,177 participants. Stress scores were lower for about 12 hours after immersion, sleep and quality-of-life gains faded, and inflammation markers went up briefly rather than down. The authors called the evidence base small.
• Sick days. The largest trial on everyday cold exposure used cold showers, not tubs. Buijze and colleagues randomized 3,018 adults in the Netherlands to finish their shower with 30, 60 or 90 seconds of cold for a month. Sickness absence fell 29 percent, and the length of the cold burst made no difference.
• Strength training. One caution. Roberts and colleagues in the Journal of Physiology in 2015 had men lift for 12 weeks and either sit in 10°C water for ten minutes after each session or do an active cool-down. The cold group gained less strength and muscle. If you lift for size, keep the plunge away from the two hours after your session, or take it before. Our post on timing sauna and cold plunge around training goes through the schedule.

Choosing between the two

Choose an ice bath if

• You want to try cold exposure once or twice at home before paying for anything
• You have a thermometer and are willing to let the ice melt until the water reads 50 to 55°F before you get in
• You are the only person using the water and you drain it afterwards

Choose a cold plunge if

• You want the same temperature every time so you can build up gradually
• You plan to do it weekly, where ice runs cost more than they look
• You care about clean water: a plunge filters and sanitizes between users, an ice bath does not
• You want to pair it with heat in the same session, which is how most people here use it

What a good cold plunge near you looks like

If you search for an ice bath or cold plunge near you in the Valley, you will find gyms with a stock tank in the corner and studios with a dedicated tub. A few questions sort them quickly.

• Is it private? A shared tub means shared water and a line. Ours is booked by the hour for you and whoever you bring, nobody else in the room.
• What temperature is it held at, and can they tell you? If nobody knows, it is an ice bath with extra steps. Our plunge is chilled and filtered and sits in the low 50s.
• Is there heat in the same room? Alternating a sauna with the plunge is what most people are actually after. The contrast therapy session here pairs the infrared sauna with the cold plunge, with the steam pod as a third option.
• Is anyone around? Cold water is not a solo activity for a beginner. A staffed studio solves that.

Your first plunge, step by step

1. Skip it if you have a heart condition, uncontrolled blood pressure, Raynaud's, are pregnant, or have been drinking. Our safety guide has the full list, and when in doubt your physician decides, not a blog post.
2. Start warmer than you think, 55 to 59°F, and shorter, 30 to 60 seconds. Our temperature and time guide has a four-week progression.
3. Walk in to the waist, exhale slowly, then lower to the shoulders. Count your breaths out for the first 30 seconds.
4. Head above water, hands in or out as you like. Get out the moment breathing will not settle or you start shivering hard.
5. Warm up by moving, not by jumping straight into the hottest sauna. Afterdrop, the continued fall in core temperature after you leave the water, is real for the first few minutes.

Frequently asked questions

Is an ice bath colder than a cold plunge?

Usually, and not on purpose. Fresh ice water sits in the 30s°F. A cold plunge is set, most often between 50 and 59°F, which is also the range the soreness research used.

How long should I stay in?

Beginners 30 to 90 seconds. The research protocols for soreness ran 10 to 15 minutes at 52 to 59°F, which is an experienced-user dose, not a first-day one.

Can I do a cold plunge every day?

Many people do, and the Dutch cold-shower trial ran daily for a month without problems. If you lift for muscle, keep it away from the hours after training.

Do I need to do the sauna first?

No, but most people prefer it. Heat first makes the water easier to tolerate and the contrast is the part people describe as the best bit. Cold first, then heat, is the order some athletes use to avoid the afterdrop chill.

Do you have an ice bath in Tarzana?

We have a chilled, filtered cold plunge inside a private lounge with an infrared sauna and a steam pod, at 19327 Ventura Blvd in Tarzana, a short drive from Encino, Woodland Hills and Sherman Oaks. Sessions are private by the hour and you can bring a guest.

Try it with someone watching the clock

The difference between an ice bath and a cold plunge is control, and control is what makes the first few sessions safe and the later ones useful. Book a private hour and we will set the water, time your first immersions, and run the sauna beside it. Pricing for single sessions and memberships is on the pricing page.