Why Your Scalp Gets “Chappy” in Winter - and How to Fix It
You know how your lips get dry and cracked when the weather cools down?
Your scalp does the same thing.
Every fall and winter, the air gets colder and drier. Heaters crank up, humidity drops, and your scalp, just like the rest of your skin, starts to lose moisture faster than it can keep up. At Cosh, we saw it in over 90% of our clients last winter: tight, flaky, irritated, “chappy” scalps that felt uncomfortable and sometimes even affected their hair health.
Here’s why that happens, what it means for your hair, and how to bring your scalp back to life.
Why your scalp dries out in cold weather
When humidity drops, the moisture in your skin starts to evaporate more quickly. Scientists call this transepidermal water loss (or TEWL for short) - basically, your scalp’s natural barrier can’t hold on to water as well, which leaves the skin dry and flaky.
Now add in indoor heating, which makes the air even drier, and you’ve got the perfect recipe for a cranky scalp. The outer layer of skin roughens, tiny micro-cracks appear, and your scalp starts to feel tight, itchy, or sensitive.
And here’s the part that most people don’t realize: when your scalp’s barrier is disrupted, it can also trigger micro-inflammation around your hair follicles. That inflammation doesn’t just feel uncomfortable, it can actually make new hair growth weaker over time.
What that might look or feel like
Fine white flakes (especially along your part or temples)
Tightness or mild itching after a shower
Sensitivity to products or other environmental factors
Hair that looks dull or feels rough at the roots
Basically, your scalp is trying to tell you it’s thirsty.
How a dry scalp affects your hair
A healthy scalp is the foundation for healthy hair. When it’s dry and irritated, your follicles can’t function at their best. Over time, this can lead to thinner, more fragile strands or slower growth.
You might also notice more shedding in the fall - this is normal and happens due to seasonal hair cycles - but dryness can make it more noticeable by weakening the scalp barrier even further.
How we help you reset your scalp
1) Revive - our Hydrafacial® Keravive-based scalp treatment
Think of this as a deep cleanse and hydration boost for your scalp.
Each treatment gently exfoliates buildup, infuses peptides and hydration, and leaves your scalp balanced and calm.
Our Revive series includes three monthly treatments that work together to refresh your scalp environment and support healthier, stronger growth over time. It’s the perfect seasonal reset when winter air is at its driest.
2) The Rootcoz Serum - hydration that lasts all day
This serum is like a drink of water for your scalp. Use it daily - after washing or anytime your scalp feels tight - to replenish moisture and calm irritation.
Treat it like you treat lip balm. Apply it before you think you need it.
Simple ways to care for your scalp this season
Turn down the heat. Hot showers feel great, but they strip your scalp’s natural oils and increase moisture loss.
Exfoliate gently once a week. Removing buildup helps your scalp absorb hydration better.
Add a humidifier. Keeping indoor humidity around 40–50% helps your skin and scalp retain moisture.
Stay consistent. Regular scalp hydration - especially with Rootcoz - keeps the barrier strong, even on the driest days.
Wear a hat or beanie. Protect your scalp when venturing out into the cold, dry air. Wearing a hat or beanie will also help trap humidity on your head.
Sleep with a silk bonnet. Similar to wearing protection when going outside, wearing a silk bonnet to sleep protects your scalp from the dry environment created by your heater and also traps humidity on your head.
When to get extra help
If your scalp feels oily and flaky, or you notice yellowish buildup or intense itchiness, you might be dealing with seborrheic dermatitis (a common winter condition). It’s nothing to worry about, and we can help guide you toward the right combination of in-spa treatments and at-home care—or refer you to a dermatologist if needed.
Your winter scalp survival plan
Book your Revive treatment to hydrate and reset your scalp through the dry months
Keep The Rootcoz Serum in your winter routine - one at your sink, one at your desk
And if you’re not sure what your scalp needs, come in for a treatment. We’ll take detailed photos, assess your hydration level, and design a plan just for you.
Because your scalp deserves the same care as your skin.
Be a little selfish this winter—and keep that scalp happy, hydrated, and ready for growth.