Frizz in the Fall and How to Manage it

We associate fall with crisp air, cozy sweaters, and leaves changing color. It’s a season of transition— including for your hair. If you’ve noticed in the fall that your strands go from smooth and hydrated to dry, frizzy, and hard-to-manage seemingly overnight, you’re not alone. This shift is normal and largely driven by changes in humidity as the temperature cools. Depending on your hair type and routine, you might experience these effects more strongly than others, since different hair structures and products react differently to environmental changes.

Whether you live somewhere that becomes drier or more humid in the fall, both extremes can trigger frizz. The outermost layer of your hair, the cuticle, is made of tiny overlapping scales that lock in moisture and protect against damage. When these scales lift, the hair’s surface becomes uneven, allowing water molecules to enter or escape more freely. This moisture imbalance alters hair structure, manifesting as frizz and loss of smoothness.^1,2 

In humid conditions, extra moisture in the air reacts with the hydrogen bonds that give hair its shape and structure. With humidity, the bonds loosen and reform, causing the tiny shingle-like layers of the cuticle to lift, allowing water to swell into the strand, creating a frizzy, puffy appearance. The same process also explains why styled hair tends to fall flat or lose its shape in humidity; the water in the air breaks and reforms those hydrogen bonds, undoing the style.^2,3

In dry conditions, the opposite happens. Moisture is pulled out of your hair, leaving it dehydrated and more prone to static. Without enough moisture or natural oils to keep the cuticle surface smooth and compact, it becomes rough, and individual hairs begin to repel one another. This buildup of static electricity leads to flyaways, like a subtler version of what happens when you rub a balloon on your hair .^4,5

Dry Hair and Scalp

The natural oils produced by your scalp should gradually move down the hair shaft, sealing in moisture and creating a protective barrier. When these oils are stripped away—whether from overwashing, harsh shampoos, or dry air—hair loses that protection and becomes more prone to static and frizz. Oils also play an important role in protecting hair from damage by reducing how much water the strand absorbs and releases with humidity changes. This helps limit swelling and shrinkage cycles, which are what can weaken the hair and make it appear frizzier over time.^5,6

Hair Porosity

Porosity refers to how easily hair absorbs and retains moisture. High-porosity hair has more gaps, or lifted scales, on the cuticle, causing it to absorb and lose moisture more easily—which makes it more reactive to both humid and dry conditions, and therefore, frizz-prone. Low-porosity hair has more tightly closed cuticle scales and fewer gaps, making it less reactive to changes in the air and less frizz-prone. Porosity is influenced by genetics as well as environmental or chemical damage.^1,6

Hair Damage

Heat drying and styling, chemical treatments (like bleaching or perming), and washing too much or too hard can all damage the cuticle by breaking the natural bonds within the hair structure, making the hair more porous.⁶ These broken bonds create more openings for moisture to interact with the strand, amplifying frizz and roughness.^2,3

Hair Curliness

Curly or coily hair is naturally more susceptible to frizz and breakage. The tighter the curl pattern, the smaller the angle of each wave, which increases friction and tension during brushing or styling, leading more easily to damage. These hair types also tend to be more porous than straight hair, meaning moisture moves in and out easily, causing dryness, loss of elasticity, and frizz—especially in changing humidity.⁶

The scalp’s natural oils travel less efficiently along tightly coiled strands, leaving the hair fiber less lubricated even when the scalp itself produces enough. This uneven oil distribution can make curly hair drier and more fragile. Frequent heat or chemical straightening compounds this effect, often resulting in breakage and increased frizz.^3,6

Managing frizz in the fall is all about preserving your hair’s moisture balance and protecting the cuticle from damage. Small adjustments to your routine can help keep strands smooth, soft, and manageable through changing weather conditions.

Gently Drying With a Microfiber Towel

Microfiber towels are much softer and smoother than traditional cotton terrycloth towels, significantly reducing friction when drying hair. Gently squeezing or patting hair dry instead of rubbing helps reduce friction to maintain a sealed, sleek cuticle.⁷

Blow-Dry with Care

Blow-drying hair can cause more damage to the cuticle than natural drying when done incorrectly, and potentially less when done correctly. To minimize damage: use the lowest heat setting, hold the dryer at least 6 inches away from the hair, and use continuous motion to prevent heating one area too much.⁸ For curly hair, use a diffuser to gently blow-dry curls while maintaining definition and avoiding frizz.¹

Heat Protectants

High heat from styling can damage the hair shaft by denaturing keratin proteins, which means breaking their folded patterns. This lifts the cuticle, leading to brittleness, rough texture, and, of course, frizz. Applying a heat protectant before styling creates a barrier that distributes heat more evenly and helps keep water inside the strand from boiling or escaping too quickly.^6,7 

Moisturizing Shampoo and Conditioner

Using a gentle, moisturizing shampoo helps preserve the scalp’s natural oils, protecting against dryness and static, while a conditioner smooths the cuticle and restores the hair’s barrier. Keep shampoo on the scalp and conditioner on the strands.^1,2 Ingredients like silicones, fatty alcohols, which are made from natural fats, and oils that are non-drying and non-irritating, reduce friction, seal in moisture, and make strands more manageable.⁶ 

For damaged hair, conditioners with hydrolyzed proteins (those that have been broken down into amino acids or peptides) are easier for hair to absorb and can help fill gaps in the cuticle and strengthen strands, improving shine and resilience.⁹ Regular deep conditioning, especially in cooler, drier months, helps maintain proper moisture and prevent frizz. 

Try Strand Serum for Long-Lasting Frizz Protection

For a fall frizz protection built for damaged or high-porosity strands, reach for Nutrafol’s Strand Serum. This physician-formulated, leave-in treatment is built around a patent-pending DualFusion™ Complex: a bi-phase blend of an oil phase (including Hemisqualane and Rosehip Fruit Extract) and a water phase (including Milk Thistle Seed Extract and Wild Olive Extract) that works at the cuticle and the cortex at the same time. The oil phase replenishes the cuticle’s lipid layer to help improve porosity, while the water phase penetrates the cortex to help strengthen strands from within.

Strand Serum was clinically tested to reduce breakage by 83% over time, reduce split ends by 62%, and deliver up to 72 hours of frizz protection, with 85% less frizz reported over that window.^† It was also tested to help protect hair from heat styling up to 450°F. Because high-porosity, damaged, bleached, and chemically treated strands tend to react most to the humidity swings that drive fall frizz, Strand Serum is designed to help protect thinning strands to reduce breakage for stronger hair that can grow longer.

Frizz is a natural—yet often unwelcome—response to weather changes, especially as fall brings fluctuating humidity and cooler air. Understanding how moisture interacts with damage and hair structure to impact the cuticle can help you make the right changes to keep strands smooth and resilient. A hair care routine with the right products—whether that’s a hydrating conditioner or a targeted treatment like Strand Serum—and styling habits for you can help you keep your hair smooth and hydrated all season long.