What to do After a Marathon. Cold Plunge or Sauna Bath?

After a marathon, many runners use both — in order. Take the cold plunge first (a commonly studied range is about 50–59°F): cold-water immersion constricts blood vessels, eases the swelling and soreness of hard running, and numbs nerve endings for short-term relief. Follow later with a sauna: the heat dilates blood vessels, supports the circulation that clears the metabolic byproducts of exercise, and switches on heat-shock proteins tied to muscle repair. Space them out — a plunge earlier, a sauna hours later or the next day — and always hydrate and check with your physician first if you have a heart or blood-pressure condition.

This guide explains why cold and heat help in different ways after a race, the order and timing that make sense, a side-by-side comparison, and how to set up recovery at home.

Key Takeaways

• Cold-water immersion after a marathon is studied for reducing exercise-induced muscle damage, swelling, and perceived soreness.
• A cold plunge tub for home makes consistent post-race cold therapy convenient — the sooner and more regularly you recover, the better most runners feel.
• Sauna heat supports muscle recovery through improved circulation and the activation of heat-shock proteins.
• The best home sauna helps cardiovascular recovery by raising blood flow and delivering more oxygen-rich blood to tired muscles.
• Alternating cold and heat — not stacking them back-to-back — lets each modality do its distinct job for physical and mental recovery.

Ran a marathon and weighing the best way to recover? You have good options, and a sauna session or a cold plunge are two of the most popular. Both help a recovering runner, but in different ways — as any physical therapist or coach will tell you. So, what should you do after a marathon: a cold plunge or a sauna bath? Let's break it down.

The short version: both cold-water immersion and sauna heat are supported by recovery research, and if you can, using both is reasonable. But they don't do the same thing — so the order and timing matter. Here's why you might do both.

Why Should You Take A Cold Plunge After A Marathon?

A cold plunge is a centuries-old practice: you immerse your body in cold (often ice-added) water for a short period. It has been used by athletes and clubs as a post-event routine for years, and social media has made it mainstream. It is also called cold-water immersion (CWI) or cold-water therapy.

For runners in recovery, cold-water immersion is studied for several benefits:

Reduces Exercise-Induced Muscle Damage

Long-distance running places high mechanical stress on muscle fibers. Cold-water immersion has been studied as a way to manage the muscle damage that follows demanding exercise. A cold plunge can help a marathoner recover in a few connected ways:

Easing Swelling

Hard running stresses muscles, which can swell. Cold immersion constricts blood vessels, which can limit the swelling response that adds to the ache in already-strained muscles.

Reducing the Perception of Soreness

Immersing your legs in cold water numbs nerve endings, which lowers the body's perception of pain in strained muscles after a race. Feeling less sore makes it easier to move normally again.

Supporting the Recovery Response

Cold immersion prompts a surge of norepinephrine and a strong circulatory response, which many athletes associate with feeling refreshed and recovering faster than passive rest alone.

Lowering Muscle Temperature

You will likely be hot and sweaty after a marathon. Using a cold plunge to bring muscle temperature down can help calm the local inflammatory response so recovery is more comfortable.

Tip: A cold plunge tub for home makes convenient post-marathon cold therapy easy and keeps your routine consistent. Learn more about muscle recovery and cold plunging: Cold Baths for Sore Muscles: The Science of Cold Immersion.

Beyond muscle recovery, cold plunging is also associated with these post-race benefits:

Improving Sleep Quality Post-Marathon

Many people who use cold-water therapy report sleeping better, and quality sleep is when the body does much of its repair work. A cold plunge may help by nudging your natural temperature cycle toward deeper rest. For more on cold therapy research, read: Ice Baths and Cold Therapy: What the Research Shows.

Promoting Mental Recovery Post-Race

Training for and running a marathon is demanding, and the mental strain can linger for days. A brief cold plunge, alongside other recovery habits, is commonly described as a mood and focus reset — a helpful part of returning to normal after a big effort.

Marathon Recovery: Cold Plunge vs. Sauna Therapy

A comparison of how cold and heat therapies target different parts of marathon recovery.

Tip: Exploring the broader cold plunge therapy benefits can give marathoners more context on physical and mental recovery. Learn more: The Science Behind Sauna and Cold Plunge Therapy: Benefits for Athletes and Fitness Enthusiasts.

How Sauna Therapy Helps After a Marathon

Alongside cold plunging, sauna therapy supports recovery after a hard race. Compared with cold immersion, a sauna session is usually more comfortable, which makes it easier to do regularly.

Supports Muscle Recovery

Like cold plunging, sauna heat can support muscle recovery — by a different route. The heat stimulates heat-shock proteins that act as cellular protectors and are involved in repairing and protecting muscle tissue, helping support recovery after endurance efforts.

Tip: A well-chosen infrared sauna for home delivers efficient, comfortable heat for post-event recovery. New to it? Read: Beginner tips on how to use a sauna.

Hormonal Recovery

Sauna heat gently raises core temperature and stimulates the endocrine system. Marathoners often finish with elevated cortisol, and a calm, warm wind-down is a common way to shift out of that stressed, "wired" state after a big effort.

Enhancing Cardiovascular Recovery Post-Marathon

Marathons place real demand on the cardiovascular system. Sauna heat raises heart rate and widens blood vessels, improving circulation so the body can move more oxygen-rich blood to tired muscles and clear the metabolic byproducts of hard exercise. Regular sauna sessions, not only during recovery, are a comfortable way to keep this cardiovascular conditioning going.

Tip: Thoughtful sauna accessories — a timer, a towel, and a water bottle within reach — make recovery sessions easier to keep up.

Relaxing the Muscles

A sauna also helps stressed muscles relax after a marathon. The heat dilates blood vessels and increases blood flow to skin and muscle, which many people find eases tightness and soreness.

For Mental Recovery After a Marathon

Sauna time is not only physical. The warm, quiet environment is a pleasant place to decompress — a simple, restorative ritual after weeks of training and a demanding race.

Why the order matters: a marathon is a large inflammatory event. Used first, the cold plunge acts like an emergency brake on that acute response in the hours after the race. Once the initial swelling settles, sauna heat becomes the "accelerator" for rebuilding — raising cardiac output without the impact of running and delivering blood to muscles when they are most ready to recover. That is why alternating the two, rather than stacking them, tends to work best.

Tip: Not sure which cold option fits you? Compare cold plunge vs. ice bath for recovery to choose the right cold therapy for your routine.

Featured Sun Home Saunas & Cold Plunges

Setting up recovery at home? These verified specs help you match a unit to your space (pricing is always shown live on each product page):

• Cold Plunge Pro — hard-shell plunge with an integrated chiller, Temp Range 32°F – 70°F (the commonly studied 50–59°F recovery window sits well inside it), 150-gallon capacity, running at roughly ~1 kWh/day (<$1/day) in energy use.
• Cold Plunge Standard — inflatable plunge with chiller, Temp Range 32°F – 107°F, designed for continuous operation so it is ready whenever you are.
• Eclipse indoor infrared saunas run 0–165°F; Luminar outdoor infrared reaches 0–170°F (among the highest published max temps in its class); the 1-person Pod runs up to 149°F — comfortable options for the heat half of your routine.

Browse the full lineup: infrared saunas and cold plunge tubs.

Quick Facts About Sauna and Cold Water Immersion After Marathons

• A studied cold window: Research on post-exercise recovery often uses cold-water immersion in roughly the 50°F–59°F (10°C–15°C) range for short durations — comfortably within a home plunge's settings.
• Heat and circulation: Sauna heat raises heart rate and widens peripheral blood vessels, increasing blood flow — one reason heat is used to support circulation-driven recovery.
• Order and spacing: Cold first to calm the acute post-race response, heat later (hours apart or the next day) to support rebuilding — not both back-to-back.
• Hydration is non-negotiable: Both cold and heat therapy add to fluid turnover; drink water before and after, and skip alcohol around either session.

Frequently Asked Questions

Should I cold plunge or sauna first after a marathon?

Most runners plunge first. Cold immersion calms the acute swelling and soreness in the hours right after the race; sauna heat is better used later — hours apart or the next day — to support circulation and muscle rebuilding.

How cold should the plunge be after a race?

Post-exercise recovery research commonly uses about 50°F–59°F for short immersions. Start conservatively, keep sessions brief, and get out if you feel unwell.

Is it safe to do both cold plunge and sauna the same day?

For many healthy runners, yes — but space them out rather than stacking them, hydrate well, and talk with your physician first if you have a heart, blood-pressure, or circulatory condition, or are pregnant.

In Conclusion

So, what should marathoners do? Both sauna therapy and cold plunging support recovery from a hard race — they simply do different jobs. The practical approach is to use both but alternate them: a cold plunge earlier to settle the acute response, and a sauna later (or the next day) to support rebuilding and wind down before sleep. Happy recovery!

Sun Home Saunas builds some of the world's best infrared saunas, the popular infrared sauna blanket, and home cold plunge tub setups to help you build a recovery routine that lasts.

Reach out to our sauna experts to bring heat and cold therapy into your recovery routine.

References

1. Cleveland Clinic. (2021). Cortisol: What it is, function, symptoms & levels. https://my.clevelandclinic.org/health/articles/22187-cortisol
2. Fenton Crosland Kelley, & James Arthur Ramsay. (2018). Excretion | biology. In Encyclopædia Britannica. https://www.britannica.com/science/excretion
3. Iguchi, M., Littmann, A. E., Chang, S. H., Wester, L. A., Knipper, J. S., & Shields, R. K. (2012). Heat stress and cardiovascular, hormonal, and heat shock proteins in humans. Journal of Athletic Training, 47(2), 184–190. https://doi.org/10.4085/1062-6050-47.2.184
4. Wilson, L. J., Cockburn, E., Paice, K., Sinclair, S., Faki, T., Hills, F. A., Gondek, M. B., Wood, A., & Dimitriou, L. (2018). Recovery following a marathon: a comparison of cold water immersion, whole body cryotherapy and a placebo control. European Journal of Applied Physiology, 118(1), 153–163. https://doi.org/10.1007/s00421-017-3757-z