Does Hair Grow Faster in the Summer? Exploring Facts and Myths

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As the days get longer and the temperature rises, many people wonder if their hair will grow faster during the summer months. This question has been debated for years, with some claiming that hair grows faster in the summer, while others argue that it’s merely a myth. In this comprehensive guide, we will explore the science behind hair growth, the impact of environmental factors, and the truth behind the question: does hair grow faster in the summer?

Understanding the Hair Growth Cycle

To determine whether hair grows faster in the summer, it’s essential to understand the hair growth cycle. This cycle consists of four distinct phases:

Anagen (Growing) Phase

This phase lasts about 3-5 years and is when hair follicles actively produce new hair. During the anagen phase, hair grows at an average rate of about half an inch per month, or six inches per year.

Catagen (Transition) Phase

The catagen phase is a brief period of about 10 days during which hair growth slows down, and the follicles shrink. Hair begins to separate from the base of the follicle but remains in place.

Telogen (Resting) Phase

During the telogen phase, which lasts approximately three months, hair doesn’t grow but usually doesn’t fall out either. This phase is when new hairs form in follicles that have produced hair during the catagen phase.

Exogen (Shedding) Phase

In the exogen phase, which lasts 2-5 months, hair sheds from the scalp. It’s normal to lose 50 to 100 hairs per day during this phase, as new, healthy hairs are on their way.

The Impact of Warmer Weather on Hair Growth

Now that we understand the hair growth cycle let’s explore the impact of warmer weather on hair growth. Some studies suggest that increased sun exposure and warmer temperatures can boost the supply of nutrients needed for keratin production. Keratin is a protein essential for hair growth, and when its production increases, hair can grow faster.

However, it’s essential to note that it’s not the summer season itself that stimulates hair growth. Instead, it’s the climatic conditions associated with warmer weather that can potentially boost hair growth. So, if you’re experiencing a cool summer with a lack of sunlight, it’s unlikely that your hair will grow faster.

How Vitamin D Affects Hair Growth

One of the main factors contributing to increased hair growth during the summer months is the increased exposure to sunlight. Sunlight is a natural source of vitamin D, which plays a crucial role in hair growth.

According to Healthline, vitamin D is responsible for stimulating new and old hair follicles. When there isn’t enough vitamin D in your system, new hair growth can be stunted. Therefore, increased sun exposure during the summer months can lead to increased vitamin D levels and, in turn, faster hair growth.

Circulation and Hair Growth

Higher temperatures during the summer months mean that your body doesn’t need to work as hard to keep everything warm. As a result, your blood circulation can focus on flowing to the skin and scalp. This enhanced blood flow ensures that your scalp receives all the essential nutrients and oxygen it needs for keratin production. Increased keratin production leads to faster and healthier hair growth.

Does Hair Grow Faster in the Summer? Fact or Fiction?

Based on the scientific evidence and the factors discussed above, it’s safe to say that hair can grow faster in the summer, depending on the climatic conditions. Warmer temperatures, increased sun exposure, and enhanced circulation all contribute to increased hair growth.

However, it’s essential to remember that individual experiences may vary, and not everyone will experience faster hair growth during the summer months. Additionally, it’s crucial to protect your hair from excessive sun exposure, which can dry out and damage the hair shaft.

Summer Hair Care Tips for Healthy Growth

To ensure that your hair remains healthy and vibrant during the summer months, follow these simple hair care tips:

Trim Your Hair

If you’ve been growing your hair out during the winter and spring, now is the perfect time to trim any split ends and refresh your style.

Protect Your Hair from the Sun

Apply hair care products containing UV filters to protect your hair from sun damage and prevent color-processed hair from fading. You can also wear a wide-brimmed hat, bandana, or other head coverings to shield your hair from harmful UV rays.

Keep Your Hair Hydrated

During the summer, you might find yourself washing your hair more frequently. Use a clarifying or anti-residue shampoo once a week to remove product buildup and other chemicals, followed by a deep-conditioning treatment to keep your hair moisturized.

Minimize Heat Styling

As much as possible, avoid using blow dryers, curling irons, straighteners, and other hot tools during the summer months. These tools can further damage your hair, especially when combined with sun exposure.

Fight Frizz

A drop or two of an anti-frizz product, such as argan oil, can help smooth hair and add shine. Be sure to start with a small amount to avoid weighing down your hair.


In conclusion, the answer to the question – does hair grow faster in the summer – is yes, but it depends on the specific climatic conditions. Warmer temperatures, increased sun exposure, and enhanced circulation can contribute to faster hair growth during the summer months. However, it’s crucial to take proper care of your hair during this time to ensure that it remains healthy and strong. By following the summer hair care tips outlined above and incorporating a scalp massage into your routine, you can enjoy beautiful, vibrant hair all year round.

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