Does Hair Really Grow Faster in the Summer?

Many people notice their hair feels thicker, fuller, or longer during the warmer months and wonder if the sun has something to do with it. The idea that hair grows faster in the summer isn’t entirely a myth—there’s some truth to it, although the difference might not be as dramatic as you think.

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How Hair Growth Works

Hair growth happens in cycles:

• Anagen (growth phase): Hair actively grows from the follicle.
• Catagen (transition phase): Growth slows and the follicle shrinks.
• Telogen (resting phase): The strand eventually sheds, making way for new hair.

On average, hair grows about 0.5 inches (1.25 cm) per month, or roughly 6 inches (15 cm) per year. Genetics, age, nutrition, and health play the biggest role in this process.

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Why Hair Might Grow Faster in Summer

There are a few reasons why you may notice a difference:

1. Increased Blood Circulation
   Warmer weather encourages better circulation throughout the body, including the scalp. Good blood flow means hair follicles receive more oxygen and nutrients, which can support growth.
2. More Vitamin D
   Spending more time outdoors exposes your body to sunlight, which helps produce vitamin D. This vitamin plays a role in stimulating hair follicles.
3. Improved Mood and Activity
   People tend to be more active in summer, eating lighter foods, exercising more, and spending time outside. All these factors improve overall health, which reflects in hair growth.
4. Seasonal Hair Cycle
   Some studies suggest that hair density increases in summer, possibly as a protective response to UV exposure. This may make hair appear fuller and healthier.

Here is how to keep your hair hydrated in hot climates

The Limitations

While these factors can boost growth, the difference is modest. You might gain a few extra millimeters per month, but it won’t suddenly double your hair growth rate. Genetics and consistent care still matter far more than seasonal changes.

Tips to Maximize Summer Hair Growth

• Protect your scalp: Too much sun exposure can damage follicles. Wear hats or use UV-protective sprays.
• Stay hydrated: Dehydration affects your scalp and hair. Drink plenty of water.
• Eat nutrient-rich foods: Include protein, iron, omega-3s, and vitamins for healthy growth.
• Keep up your routine: Regular cleansing, conditioning, and scalp care prevent buildup that hinders growth.

5 things that are affecting your scalp health, click here to find out

Bottom Line

Yes, hair can grow slightly faster in the summer thanks to improved circulation, vitamin D, and lifestyle changes. But the boost is minor—consistent care and nutrition are what truly determine how healthy and fast your hair grows, no matter the season.