Should women cold plunge? Here’s what the science actually says.
There is a question I get asked almost every week.
Should I be cold plunging? Is it safe during my period? Am I doing it right?
The honest answer is that we don’t yet have a complete picture. What we do know should be changing the way women approach cold and heat exposure entirely.
Should women cold plunge?
Yes. Catecholamine release, brown fat activation, reduced inflammation, improved mood. The physiological case is well established across both sexes.
But how your body responds to cold changes depending on where you are in your cycle. Women vasoconstrict faster than men during immersion, and core temperature drops more steeply. Especially in the luteal phase when progesterone is elevated. The same session that supports recovery in week one can push your stress response in the wrong direction in week three.
This doesn’t mean don’t plunge. It means the protocol should shift with your cycle.
A 2024 study of over 1,100 women who cold water swam regularly found nearly half reported meaningful reductions in anxiety, irritability, and mood swings. Women in perimenopause reported fewer hot flushes and significantly better mood. The practice works. The gap is in the precision.
Should women sauna differently?
Yes, same logic applies. In the luteal phase, progesterone already elevates your core temperature. Research points toward shorter sessions of 10 to 15 minutes in this phase to avoid compounding that thermal load, while still getting the cortisol and mood benefits that regular heat exposure delivers over time.
Does stress hit women and men differently?
Physiologically, yes. Cold exposure that lowers cortisol in a man can raise it in a woman at the wrong point in her cycle. This is one of the most consistent findings in the literature — and one of the most ignored in protocol design.
What we don’t yet know
Most cold and heat studies were done on men. Female-specific data on optimal temperature, duration, fertility effects, and interaction with hormonal contraception is still limited. These are open questions — and important ones.
Next week: Can PMS symptoms be meaningfully reduced with cold and heat?
— Susanna
Want to go deeper? Here's where to start:
The Cold Water Immersion Course Everything you need to start cold water immersion safely — the science, the physiology, and the practical guidance to build it into your life. Evidence-based and self-paced, taught by Dr. Susanna Søberg, PhD.
Thermalist® Method at Home A 3.5-hour online course covering cold exposure, sauna therapy, and breathwork — the science behind why contrast therapy works and how to apply it at home. Built on the Søberg Principle and the Thermalist® Method.
3 Weeks Thermalist Cure® A structured three-week protocol combining cold, heat, and breathwork — practised together to reset your stress response and rebuild resilience. The transformation happens when all three work in sequence, not in isolation.
The Søberg® 12-Week Reset A guided 12-week journey to understand your body, regulate stress, and build sustainable habits across cold exposure, heat, sleep, movement, breathwork, and nutrition. The most comprehensive program in the Søberg Institute.
The Søberg Institute
