Seasonal Hair Shedding: Why You Lose More Hair in October (and What Helps)
Quick answer: Losing more hair in October is usually normal seasonal shedding. Research shows more hairs enter the resting (telogen) phase in July, and because that phase lasts about 100 days, they fall out in October and November. It typically settles by winter. Shedding that lasts more than three months, or comes with thinning patches or scalp irritation, should be checked by a trichologist.
If you've been pulling more hair out of your brush, your shower drain, or your sweater lately, you're not imagining it. October is one of the heaviest shedding months of the year, and every fall my clients ask me the same question: "Is something wrong with my hair?"
Most of the time, the answer is no. What you're seeing is seasonal shedding, a normal and well-documented rhythm in the hair growth cycle. As a certified trichologist who has specialized in hair since 2003, I want to walk you through why it happens, what the sun has to do with it, and what we can do together to protect your density through the season.
Why October is peak shedding season
The hair you're losing this month actually got the signal to let go back in July. Every hair on your head cycles through three phases:
Anagen (growth): the active phase, lasting two to seven years.
Catagen (transition): a short window of a few weeks when growth stops.
Telogen (rest): about three months when the hair sits in the follicle before it sheds to make room for a new one.
Research tracking hundreds of women found that the share of hairs entering the resting phase peaks in July and is lowest in late winter (Kunz et al., 2009). Because that resting phase lasts roughly 100 days, the hairs that went to rest in midsummer release in October and November. Earlier studies found the same late-summer-to-fall pattern (Randall & Ebling, 1991; Courtois et al., 1996).
In other words, October shedding is a delayed echo of summer. It's not new damage. It's your hair finishing a cycle it started months ago.
What the sun has to do with it
The leading theory is protective. Long, bright summer days and stronger UV exposure appear to shift more follicles into the resting phase together. Some researchers think extra hair coverage once helped shield the scalp in summer, and the body sheds that surplus once the season turns (Belgravia Centre).
Light also drives melatonin, a hormone that helps regulate the hair cycle. Melatonin runs lowest at the end of summer, which lines up with more follicles moving into rest (Typology).
Now the days are getting shorter, and daylight saving time ends on Sunday, November 1. Less daylight means less sun on your skin, and lower vitamin D has been associated with increased shedding (Belgravia Centre). So the shorter days don't cause the October shed, but they're a good reminder to support your scalp heading into winter.
Normal shedding vs. when to get checked
Seasonal shedding is usually diffuse, spread evenly across the scalp, and it tapers off by winter. Book a consultation if you notice any of these:
Shedding that lasts longer than three months
A widening part or thinning at the crown or temples
Patches, bald spots, or broken hairs
An itchy, flaky, red, or tender scalp
Shedding after illness, surgery, pregnancy, a new medication, or a major stressor
Seasonal shedding can also hide or overlap with other types of hair loss. That's why an in-person scalp assessment matters more than guessing from the drain.
What we do in the chair
You can't stop a cycle that already started, but you can make sure the hairs growing in next are as strong as possible. In my studio, fall is when I focus on the scalp:
Scalp assessment: I look at density, the part line, and the condition of the scalp to tell seasonal shedding apart from something that needs more attention.
Avjou Researche™ scalp protocol: I recommend Avjou Researche™ because it's built around the scalp, not just the strand. The Signature Shampoo cleanses without sulfates, the Vitamin Mask uses Redensyl™ and vegan keratin to strengthen and nourish, and the oil-free Scalp Serum combines Redensyl™, Capixyl™, and Greyverse™ to support thicker, fuller-looking hair. It's vegan, color- and keratin-safe, and free of silicones, parabens, and synthetic fragrance .
Gentle handling: lower-tension styling and careful work around extensions so we don't add breakage on top of the shed.
The goal is to keep follicles healthy so new growth comes in full when the cycle turns.
What you can do at home
Hair is one of the last places your body sends nutrients, so your daily habits show up in your density months later.
Eat enough protein. Hair is made of keratin, a protein. Include protein at every meal.
Watch iron, zinc, and vitamin D. Low levels are linked to shedding. Ask your doctor about bloodwork before adding supplements.
Drink your water. A dry scalp is an unhappy scalp, and heaters dry out the air in fall.
Protect your sleep. Seven to nine hours supports the hormones that regulate the growth cycle.
Manage stress. A stressful stretch can trigger extra shedding about three months later.
Be gentle. Use a wide-tooth comb on wet hair, loosen tight styles, and turn the heat down.
Worried about your shedding? Let's look together.
If you're in Oakley, Brentwood, Antioch, Discovery Bay, or anywhere in East Contra Costa County and your shedding feels like more than the season, book a private scalp consultation with a certified trichologist. We'll figure out what's normal, what isn't, and build a plan to protect your hair through winter. Book your consultation
Frequently asked questions about fall hair loss
Is it normal to lose more hair in the fall? Yes. Studies show shedding peaks in late summer and fall, with the most hairs falling out in October and November. It's a normal part of the hair growth cycle.
How long does seasonal hair shedding last? Seasonal shedding usually lasts a few weeks to about three months and eases by winter. If it continues past three months, book a scalp assessment.
How much hair loss per day is normal? Losing roughly 50 to 100 hairs a day is considered normal, and that number can rise temporarily during seasonal shedding.
Does daylight saving time cause hair loss? No. The October shed starts with changes in July. Shorter days can mean less vitamin D, though, so fall is a good time to support your scalp.
Will hair from seasonal shedding grow back? Yes. Seasonal shedding is part of a normal cycle, and new hairs grow from the same follicles. A healthy scalp helps that new growth come in strong.
Can products stop seasonal shedding? No product can stop a cycle that already started. Scalp-focused care like Avjou Researche™ supports the health of the follicle so regrowth comes in fuller-looking.
Where can I see a trichologist near Oakley, CA? Samantha Dean Hair offers private scalp consultations with a certified trichologist in Oakley, serving East Contra Costa County.
About the author: Samantha Dean is a certified trichologist and extension specialist who has specialized in hair since 2003. She runs Samantha Dean Hair, a private hair restoration and extension studio in Oakley, California, voted Best Stylist, Best Colorist, and Best Salon in Best of Oakley and Best Stylist/Salon on Nextdoor.
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