Most cold plunge guides put the water between 50 and 59°F (10 to 15°C). Forbes Health reports that studies on cold water immersion used temperatures from about 38 to 60°F, with 50 to 59°F named as a common range. Beginners usually start at the warm end, around 55 to 60°F, and keep the first sessions short. There is no single right number, so pick a temperature you can handle calmly and ask your doctor what is safe for you.
This guide shows typical temperatures in a simple chart, how long people stay in, and how to reach and hold your temperature at home with ice, winter weather or a chiller.
Cold plunge temperature chart
| Water temperature | How it is usually described |
|---|---|
| 60 to 65°F (16 to 18°C) | Cool. A gentle start for first-timers. |
| 55 to 60°F (13 to 16°C) | Cold. A common beginner range. |
| 50 to 59°F (10 to 15°C) | The range most guides and studies name. |
| 45 to 50°F (7 to 10°C) | Very cold. Usually for experienced plungers. |
| Below 45°F (below 7°C) | Ice-cold. Shorter sessions, more caution. |
Sources: Forbes Health for the study ranges. The beginner and experienced ranges reflect what owners commonly report, for example in the r/coldplunge community. These are general descriptions, not medical advice.
What temperature should a cold plunge be for beginners?
Beginners usually start warmer, around 55 to 60°F, and lower the temperature slowly over weeks. The first seconds in cold water bring a gasp and fast breathing, so a milder start makes it easier to stay calm.
- Start warmer and shorter than you think you need.
- Lower the temperature in small steps, not all at once.
- Keep the temperature steady for a while, so you can compare sessions.
- Never plunge alone, and talk to your doctor first, especially with a heart condition or high blood pressure.
Is colder better?
Not necessarily. Colder water is harder to handle, and Forbes Health notes that sudden immersion in water below about 50 to 60°F can cause cold shock: gasping, rapid breathing and spikes in heart rate and blood pressure. So many owners settle on a temperature they can sit in calmly rather than chasing the lowest number. We do not make health claims about any temperature.
How long should you stay in a cold plunge?
Most people stay in for one to a few minutes, then get out and warm up. Colder water usually means a shorter session. There is no single safe time for everyone, so start short and ask your doctor what fits you.
A simple way to keep track is a timer you can see from the tub, and getting out as soon as you start to shiver hard or feel unwell.
How to reach and hold your temperature at home
There are three ways to get the water cold: ice, cold weather, or a chiller. Each one gives you a different level of control.
Ice
Fill the tub with cold tap water, then add ice until a thermometer shows the temperature you want. The water warms up as the ice melts, so the temperature drifts during and after the session. The bigger the tub, the more ice it takes: the Baltic holds 132 US gallons and the Polar 190 US gallons. A cover and some shade slow the warming.
Cold weather
In many states, backyard water stays cold for months without ice. Our data study cold-plunge-ready states shows where that works best. In winter, plan for freezing: see cold plunge tub care.
Chiller
A chiller cools, circulates and filters the water and holds the temperature you set, so the number stays the same every day. You set it within the chiller's range. The Flow Cold Plunge ($7,850 or $8,336) has a stainless steel tub and a hidden cedar compartment for a compatible chiller, which is sold separately. For the trade-offs, read cold plunge with chiller or ice.
| Ice | Cold weather | Chiller | |
|---|---|---|---|
| Temperature control | Drifts as ice melts | Depends on the season | Holds a set temperature |
| Work per session | Buy and add ice | None, but watch for freezing | None |
| Power needed | No | No | Yes, an outlet near the tub |
| Best for | Trying it, occasional use | Cold climates, part of the year | Daily use, same temperature |
Our cold plunge tubs
- Baltic Plunge Tub: upright cedar barrel, 132 US gallons, $2,554.50. Ice or cold weather; a chiller can be added later.
- Polar Plunge Tub: long tub to lie back in, 190 US gallons, $3,444 (white liner) or $6,428 (stainless steel liner). Ice or cold weather; a chiller can be added later.
- Flow Cold Plunge: stainless tub with a concealed chiller compartment, $7,850 or $8,336, chiller sold separately.
- Sweaty Yeti Plunge Max: an insulated plunge room with an integrated chiller and heater, from $44,400.
Compare them in Baltic vs Polar vs Flow or the cold plunge tub buying guide.
Cold plunge temperature: FAQ
What is the ideal cold plunge temperature?
Most guides name 50 to 59°F (10 to 15°C). Beginners often start warmer, around 55 to 60°F. The right temperature is one you can handle calmly, after checking with your doctor.
Is 40 degree water too cold for a cold plunge?
It is at the very cold end. Studies cited by Forbes Health went as low as about 38°F, but water that cold is usually for experienced plungers and very short sessions. Beginners should start much warmer.
Is 20 minutes too long in a cold plunge?
For most people, yes. Most sessions last one to a few minutes. Get out sooner if you shiver hard, feel numb or feel unwell.
How do I measure the water temperature?
Use a floating pool thermometer, or read the display if you have a chiller. Check before every session, because the temperature changes with ice and weather.
What temperature is a cold plunge in Celsius?
The common range of 50 to 59°F is 10 to 15°C. A beginner range of 55 to 60°F is about 13 to 16°C.
Should I cold plunge before or after a sauna?
Many people alternate: heat up in the sauna, cool down in the plunge, rest and repeat. See sauna and cold plunge setup and what is a cold plunge.
Find your cold plunge
Browse the cold plunge collection or sauna and cold plunge sets. Questions about ice, chillers or winter use? Call +1 (307) 309-8328.