a SaunaShare companyWhere the benefits cluster
50–59°FReviews found 10 to 15 minutes at 50 to 59°F best for soreness after hard exercise.1,2
Low-certainty evidence. Time mattered more than temperature.3
Cold plunge temperature, by the research.
How cold your plunge or ice bath should be depends on what you want from it. Here’s what the studies used for recovery, mood and alertness, where the danger lines are, and how to get used to colder water.
The short answer
What the research shows.
Mood doesn’t need ice
5 minFive minutes at about 57°F lifted mood in adults with low mood. At 68°F, first-timers felt more alert and inspired.4,5
Mood measured right after the dip.
The cold-shock line
50°FCold shock peaks at 50°F. Colder water doesn’t make the first gasp bigger. It makes it last longer.6,7
A gasp can start in water as warm as 77°F.8
Four numbers worth knowing
The lines on the thermometer.
Cold plunge temperature chart
What the studies actually used.
Every row is a real study or official guideline, placed at the water temperature it used. Blue rows are what people did and what happened. Coral rows are warnings.
Read it with time in mind. The coldest water in the research was used for the shortest dips: 20 seconds at 32 to 36°F for winter swimmers12, about a minute and a half for the Copenhagen swimmers13. The hour-long baths were at 57°F and warmer14.
Nothing on the chart says colder is better. For soreness, the largest review found temperature didn’t change the benefit3.
Winter swimming dips32 to 36°F · 20 seconds · noradrenaline doubled or tripled every time12
Ice water, lightly clothed32°F · Core fell to 95°F, the start of hypothermia, in 25 to 40 minutes15
Copenhagen winter swimmers34 to 48°F · About 1.4 minutes a dip, 11 minutes a week13
Head under, breath held41 to 50°F · Irregular heartbeats in 11 of 12 healthy people16
Recovery: muscle damage and jumps41 to 50°F · 10 to 15 minutes2
Cold end of a shower50 to 54°F · 30 to 90 seconds · 29% fewer sick days off work17
Mood trialAbout 57°F · 5, 10 or 20 minutes in seawater · 5 did as well as 204
One-hour cold bath57°F · Noradrenaline up 530%, metabolic rate up 350%14
Mood and alertness, first-timers68°F · 5 minutes · more alert, active and inspired5
One-hour cool bath68°F · Metabolic rate up 93%14
Heart-failure patients72°F · Extra heartbeats rose from 15 to 76 per 30 minutes19
Gasping still possibleUp to 77°F · Sudden entry can trigger a gasp in water this warm8
By goal
How cold for what.
Less soreness after hard exercise
50 to 59°F10 to 15 min
A meta-analysis of nine trials found the best soreness results at 50 to 59°F for 10 to 15 minutes, though the benefit was small, about a third of a point on a 0 to 10 soreness scale1. A 2026 review of 15 meta-analyses agreed for soreness and found 41 to 50°F did better for muscle damage and jump recovery2.
The largest review, 44 trials, found temperature made no difference. Time did: short and medium sessions helped, long ones didn’t3. If you lift for size or strength, plunging after every session can blunt the gains2.
A better mood
57 to 68°F5 min
In a 2026 trial of 140 adults with low mood, five minutes in seawater at about 57°F lifted mood scores as much as twenty, while the control group didn’t change4. Five minutes at 68°F left people new to cold water feeling more active, alert, inspired and proud, in a study without a control group5.
A 2025 meta-analysis of 11 trials found lower stress 12 hours after a plunge, but no clear effect on mood10. You don’t need the coldest water to feel better.
A jolt of alertness
32 to 57°F20 sec to 1 hr
Twenty-second winter dips at 32 to 36°F doubled or tripled noradrenaline, a chemical behind alertness, every session for 12 weeks12. An hour at 57°F raised it 530%14. Near-freezing water did it in seconds. At 57°F, the study ran a full hour. The table below shows what changes between 90, 68 and 57°F.
Cold showers
50 to 54°F30 to 90 sec
Brown fat and calorie burn
59 to 61°F air6 hours a day
Same hour, three temperatures
What a few degrees change.
In a 2000 lab study, young men sat neck-deep for an hour at 90°F, 68°F and 57°F14. At 90°F, metabolism didn’t change and heart rate, blood pressure and cortisol fell. At 57°F, metabolic rate rose 350% and noradrenaline 530%. None of the three raised cortisol, the stress hormone.
| After 1 hour in | 90°F | 68°F | 57°F |
|---|---|---|---|
| Metabolic rate | No change | +93% | +350% |
| Heart rate | −15% | Fell | +5% |
| Blood pressure | −11 to 12% | Fell | +7 to 8% |
| Noradrenaline | Not reported | Not reported | +530% |
| Dopamine | Not reported | Not reported | +250% |
| Cortisol | −34% | Tended to fall | Tended to fall |
Percent changes as the study reported them. The paper’s summary doesn’t give noradrenaline or dopamine for the two warmer baths.
The temperatures people ask about
Too cold, cold enough, not cold at all.
48°F down to 34°F
That’s the range Copenhagen’s winter swimmers swim in from October to April13. They kept it short: about 1.4 minutes a dip, 2 or 3 times a week, 11 minutes a week in all. In another study, dips in 32 to 36°F water lasted 20 seconds12.
At these temperatures, cold shock lasts longer7, and in 32°F water lightly clothed adults reached the start of hypothermia in 25 to 40 minutes15. It’s a place to work up to, not start.
Is 60°F cold enough?
Almost. Research draws the line just below it, at 59°F9, and the gasp is smaller at 59°F than at 50°F6.
It’s the best place to start. Six 3-minute dips at 59°F made 50°F water much easier to handle, and the effect was still there seven months later6,18. Showers at 59°F didn’t do the same20.
68°F to 72°F
As room air, that’s mild cold. Sleeping in a 66°F room instead of a 75°F one raised energy use 5.3%22.
Water that warm still does something. An hour at 68°F raised metabolic rate 93%14, and five minutes lifted mood in first-timers5. It isn’t harmless for everyone: 72°F water raised extra heartbeats in people with heart failure19.
Temperature and time
Colder water, shorter sessions.
Colder water pulls heat out of you faster, and the rate climbs steadily as the water gets colder23. Swimming makes it worse: moving cooled people 35% faster than holding still.
Hypothermia starts when your core reaches 95°F8. In 32°F water, lightly clothed adults got there in 25 to 40 minutes15. In 50°F water, five of ten swimmers couldn’t finish 90 minutes, and one gave out at 61 minutes24.
Boating safety groups teach it as 1-10-1: about one minute of cold shock, about ten minutes of useful movement, and up to an hour before cold makes you lose consciousness, even in ice water25. It’s a teaching rule, not a lab measurement. Researchers predicted 1 to 1.5 hours of survival from hypothermia alone in 32°F water15.
| Water | Core drop per 10 minutes |
|---|---|
| 41°F | About 1.1°F |
| 45°F | About 1.0°F |
| 50°F | About 0.8°F |
| 55°F | About 0.6°F |
| 59°F | About 0.5°F |
| 64°F | About 0.3°F |
Acclimate to the cold plunge
Getting used to colder water.
The gasp is trainable, and you don’t need the coldest water to train it. This is what the lab studies did.
- Start warmer than your goal.Six 3-minute dips at 59°F, spread over four days, cut the first-30 second breathing rate in 50°F water from 47 breaths a minute to 24, and heart rate from 128 to 1096.
- Keep sessions short.Five 5-minute dips at 54°F were enough to calm the breathing response26.
- Sit still.Resting in cold water produced more adaptation than exercising in it27.
- Expect it to last.The calmer breathing was still there seven months later, and the calmer heart rate at 14 months18.
- Showers count only if they’re cold.Six 3-minute showers at 50°F trained down the gasp. Showers at 59°F didn’t20.
Contraindications
Check with a doctor first.
Most of the evidence on this page comes from healthy, screened adults. Some conditions make cold water riskier at any temperature.
- Heart disease, diagnosed or not.Known or hidden heart problems make arrhythmias and cardiac events in cold water more likely11. Even 72°F water raised extra heartbeats in heart-failure patients19.
- Long QT syndrome.Swimming is a known trigger for dangerous rhythms in type 1 long QT28.
- Cold urticaria.In 415 children with cold-triggered hives, 18.6% had anaphylaxis, and swimming set off most of those reactions29.
- Raynaud’s.Cold is the most common trigger30.
- Never put your head under.Breath-hold dunks in 41 to 50°F water caused irregular heartbeats in 11 of 12 healthy volunteers16,31.
Measuring your water
Stir it, then check it.
The lab studies on this page measured stirred water7. Above 39°F, colder water is denser and sinks32, so a still tub can be colder at the bottom than at the top. Our advice: stir, then read the thermometer at chest depth, and check a chiller’s setting with a thermometer now and then.
How much ice
About 5 pounds per 10 gallons, per 10°F.
Water gives up 1 BTU per pound for every degree it cools33,34. Each pound of ice soaks up about 144 BTU just melting34,35, then a little more warming up to your target. That works out to about 5 pounds of ice per 10 gallons for every 10°F.
| Tub | From → to | Ice, at least |
|---|---|---|
| Bathtub, 50 gal | 70 → 50°F | 52 lb |
| Plunge tub, 100 gal | 70 → 50°F | 103 lb |
| Plunge tub, 100 gal | 60 → 50°F | 52 lb |
| Plunge tub, 100 gal | 70 → 40°F | 165 lb |
| Stock tank, 150 gal | 65 → 50°F | 116 lb |
Theoretical minimums for 32°F ice. The tub, the air and your body add heat, so plan on more. Ice can’t take water below 32°F. Use the ice calculator
Quick answers
Good questions.
What is the best temperature for a cold plunge?
It depends on what you want. For soreness, reviews found 50 to 59°F for 10 to 15 minutes did best. For mood, five minutes at about 57°F worked in a 2026 trial, and 68°F lifted how people felt. Water colder than 50°F doesn’t make the first gasp stronger, but it makes it last longer.
How cold is an ice bath?
Research calls water below 59°F cold. Most cold plunge studies used water between 41°F and 59°F, and winter swimmers use water from 32°F to 48°F for much shorter dips.
How long should you stay in a cold plunge?
For recovery, 10 to 15 minutes did best, and longer sessions didn’t add benefit. Five minutes was enough for mood. A cold shower finish of 30 to 90 seconds cut sick days. The colder the water, the faster your body cools, so keep very cold dips short.
Is 39°F too cold for a cold plunge?
It’s ice-swimming territory. Winter swimmers use water that cold, but for about 20 seconds to a minute and a half per dip. In 32°F water, lightly clothed adults reached the start of hypothermia in 25 to 40 minutes, and below 50°F cold shock lasts longer. Work up to it, keep it short and never plunge alone.
Is 60°F cold enough for a cold plunge?
It’s right at the line. Research counts water below 59°F as cold, and cold shock is smaller at 59°F than at 50°F. Six 3-minute dips at 59°F took the edge off 50°F water for months, so it’s a good place to start.
What ice bath temperature is best for muscle recovery?
50 to 59°F for 10 to 15 minutes did best for soreness, and 41 to 50°F did better for muscle damage markers and jump recovery. The largest review found time mattered more than temperature. Skip the plunge right after strength sessions if muscle growth is the goal.
How much ice do I need for an ice bath?
At least 5 pounds of ice per 10 gallons for every 10°F you want to drop. Cooling 100 gallons from 70°F to 50°F takes about 103 pounds in theory, and more in practice because the tub, the air and your body add heat.
How do I get used to a colder cold plunge?
Start warmer than your goal and go often. In a lab study, six 3-minute dips at 59°F over four days cut the gasp in 50°F water almost in half, and the effect lasted at least seven months. Resting in the water adapted people better than exercising in it.
Who should avoid cold plunging?
Talk to a doctor first if you have heart disease, heart failure, an arrhythmia or long QT syndrome, cold urticaria or Raynaud’s. Never put your head under cold water while holding your breath, and don’t plunge alone.
Read them yourself
Every source on this page.
- Machado AF, Ferreira PH, Micheletti JK, de Almeida AC, Lemes ÍR, Vanderlei FM, et al. Can water temperature and immersion time influence the effect of cold water immersion on muscle soreness? A systematic review and meta-analysis. Sports Medicine, 2016.Systematic review and meta-analysis · 9 trials
- Berjisian E, Miraftabi H, Ihsan M, Homer KA, Kendall K, Roberts L, et al. Strategic application of post-exercise cold-water immersion to enhance performance recovery and adaptation: an umbrella review of 15 published systematic reviews with meta-analysis. Sports Medicine Open, 2026.Umbrella review · 15 meta-analyses · 161 studies
- Batista NP, de Carvalho FA, Machado AF, Micheletti JK, Pastre CM. What parameters influence the effect of cold-water immersion on muscle soreness? An updated systematic review and meta-analysis. Clinical Journal of Sport Medicine, 2023.Systematic review and meta-analysis · 44 trials
- Kelly JS, Davidson N, Delaney JP. Improved mood following cold-water immersion: a comparison of differing exposure durations. Lifestyle Medicine, 2026.Randomized trial · 140 adults with low mood
- Yankouskaya A, Williamson R, Stacey C, Totman JJ, Massey H. Short-term head-out whole-body cold-water immersion facilitates positive affect and increases interaction between large-scale brain networks. Biology, 2023.Single-group study · 33 adults · no control group
- Tipton MJ, Golden FS, Higenbottam C, Mekjavic IB, Eglin CM. Temperature dependence of habituation of the initial responses to cold-water immersion. European Journal of Applied Physiology and Occupational Physiology, 1998.Controlled lab study · small groups
- Tipton MJ, Stubbs DA, Elliott DH. Human initial responses to immersion in cold water at three temperatures and after hyperventilation. Journal of Applied Physiology, 1991.Lab study · 8 people · 41, 50 and 59°F
- National Weather Service. Cold water hazards and safety. National Oceanic and Atmospheric Administration.Official safety guidance
- Bleakley C, McDonough S, Gardner E, Baxter GD, Hopkins JT, Davison GW. Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise. Cochrane Database of Systematic Reviews, 2012.Cochrane review · 17 small trials · 366 people
- Cain T, Brinsley J, Bennett H, Nelson M, Maher C, Singh B. Effects of cold-water immersion on health and wellbeing: a systematic review and meta-analysis. PLoS One, 2025.Systematic review and meta-analysis · 11 randomized trials
- Knechtle B, Waśkiewicz Z, Sousa CV, Hill L, Nikolaidis PT. Cold water swimming: benefits and risks, a narrative review. International Journal of Environmental Research and Public Health, 2020.Narrative review
- Leppäluoto J, Westerlund T, Huttunen P, Oksa J, Smolander J, Dugué B, et al. Effects of long-term whole-body cold exposures on plasma concentrations of ACTH, beta-endorphin, cortisol, catecholamines and cytokines in healthy females. Scandinavian Journal of Clinical and Laboratory Investigation, 2008.Lab study · 20 women · 12 weeks
- Søberg S, Löfgren J, Philipsen FE, Jensen M, Hansen AE, Ahrens E, et al. Altered brown fat thermoregulation and enhanced cold-induced thermogenesis in young, healthy, winter-swimming men. Cell Reports Medicine, 2021.Cross-sectional study · 8 winter swimmers, 8 controls
- Šrámek P, Šimečková M, Janský L, Šavlíková J, Vybíral S. Human physiological responses to immersion into water of different temperatures. European Journal of Applied Physiology, 2000.Lab study · young men · 1-hour immersions
- Hayward JS, Eckerson JD. Physiological responses and survival time prediction for humans in ice-water. Aviation, Space, and Environmental Medicine, 1984.Lab study · 21 adults in 32°F water
- Tipton MJ, Kelleher PC, Golden FS. Supraventricular arrhythmias following breath-hold submersions in cold water. Undersea & Hyperbaric Medicine, 1994.Lab study · 12 people, 36 submersions
- Buijze GA, Sierevelt IN, van der Heijden BC, Dijkgraaf MG, Frings-Dresen MH. The effect of cold showering on health and work: a randomized controlled trial. PLoS One, 2016.Randomized trial · 3,018 adults · unblinded, self-reported
- Tipton MJ, Mekjavic IB, Eglin CM. Permanence of the habituation of the initial responses to cold-water immersion in humans. European Journal of Applied Physiology, 2000.Controlled lab study · 14-month follow-up
- Schmid JP, Morger C, Noveanu M, Binder RK, Anderegg M, Saner H. Haemodynamic and arrhythmic effects of moderately cold (22 degrees C) water immersion and swimming in patients with stable coronary artery disease and heart failure. European Journal of Heart Failure, 2009.Lab study · 22 men with heart disease
- Eglin CM, Tipton MJ. Repeated cold showers as a method of habituating humans to the initial responses to cold water immersion. European Journal of Applied Physiology, 2005.Lab study · 18 adults
- van der Lans AA, Hoeks J, Brans B, Vijgen GH, Visser MG, Vosselman MJ, et al. Cold acclimation recruits human brown fat and increases nonshivering thermogenesis. Journal of Clinical Investigation, 2013.Lab study · 10 days in a cold room
- Chen KY, Brychta RJ, Linderman JD, Smith S, Courville A, Dieckmann W, et al. Brown fat activation mediates cold-induced thermogenesis in adult humans in response to a mild decrease in ambient temperature. Journal of Clinical Endocrinology and Metabolism, 2013.Randomized crossover · 24 adults · cool air
- Hayward JS, Eckerson JD, Collis ML. Thermal balance and survival time prediction of man in cold water. Canadian Journal of Physiology and Pharmacology, 1975.Ocean immersion study and cooling model · 40 to 65°F water
- Tipton M, Eglin C, Gennser M, Golden F. Immersion deaths and deterioration in swimming performance in cold water. Lancet, 1999.Lab study · 10 swimmers
- Canadian Safe Boating Council. 1-10-1 principle.Safety council guidance · teaching rule of thumb
- Tipton MJ, Wakabayashi H, Barwood MJ, Eglin CM, Mekjavic IB, Taylor NA. Habituation of the metabolic and ventilatory responses to cold-water immersion in humans. Journal of Thermal Biology, 2013.Lab study · 21 men
- Golden FS, Tipton MJ. Human adaptation to repeated cold immersions. Journal of Physiology, 1988.Lab study · 16 people
- Choi G, Kopplin LJ, Tester DJ, Will ML, Haglund CM, Ackerman MJ. Spectrum and frequency of cardiac channel defects in swimming-triggered arrhythmia syndromes. Circulation, 2004.Genetic cohort · 388 patients
- Yee CSK, El Khoury K, Albuhairi S, Broyles A, Schneider L, Rachid R. Acquired cold-induced urticaria in pediatric patients: a 22-year experience in a tertiary care center (1996-2017). Journal of Allergy and Clinical Immunology: In Practice, 2019.Chart review · 415 children
- National Institute of Arthritis and Musculoskeletal and Skin Diseases. Raynaud's phenomenon. National Institutes of Health.Official health information
- Shattock MJ, Tipton MJ. 'Autonomic conflict': a different way to die during cold water immersion? Journal of Physiology, 2012.Review
- U.S. Geological Survey Water Science School. Water density.Official science reference
- U.S. Geological Survey Water Science School. Specific heat capacity and water.Official science reference
- National Institute of Standards and Technology. Guide for the use of the International System of Units (SP 811), Appendix B.8: factors for units listed alphabetically.Official unit conversions
- Nave R. Melting points and heats of fusion. HyperPhysics, Georgia State University.University physics reference
How this page was made. We read each study and checked every number here against its PubMed record, the published paper or the official page. Temperatures are converted to °F and rounded to the nearest degree. The cooling and ice figures are our own arithmetic from the cited equations and constants. We aren’t doctors, and this page hasn’t had a clinical review. Reviewed October 20, 2026. Spotted something we got wrong? Tell us.
More from the research: cold plunge benefits, cold plunge dangers and cold plunges and testosterone.