Does Hair Grow Faster in the Summer?

Does Hair Grow Faster in the Summer?

In the search to better understand hair growth, we might wonder how we can make our hair grow faster. While not totally in our control, one common beauty myth is that hair grows faster in the summer. So should we all be flocking to warm weather summer destinations in order to promote longer locks? Read on to find out if hair actually grows faster in the summer. 

The hair growth cycle, explained

Before we answer the question “does hair grow faster in the summer?”, let's quickly remind ourselves of the hair cycle. Hair perpetually goes through different phases of the hair growth cycle. 

Anagen Phase

Also known as the growth phase, the anagen phase lasts between 2-7 years for each follicle. Around 85-90% of the hairs on our scalp are in this phase at any given time, on average growing half a millimeter each day. Hair also tends to grow faster towards the beginning of the anagen phase.

Catagen Phase

The catagen phase is when hair follicles start to shrink and the rate of hair growth slows down. This period lasts around 2-3 weeks on average, and leads to the hair stopping growth all together and becoming a club hair (or fully-developed hair). 

Telogen Phase

Time for the hair to rest and reset. While hair shedding might cause panic to some, it’s important to note that it is actually a part of a healthy growth cycle. Around 10-15% of your follicles are in the telogen phase, which lasts for 2-4 months. 

Does hair grow faster in the summer?

Blood circulation

Throughout summer, we’re typically more active. Moving more and being exposed to the summer sun helps to increase blood flow in our bodies, even in our scalp. Increased blood circulation (whether during summer or other parts of the year) could potentially promote healthy hair growth by increasing the amount of nutrients delivered to the hair follicle. 

Varied Diet

In most places around the world, summer offers a larger variety of accessible fruits and vegetables compared to the winter. While vitamin deficiencies may not be the root cause of hair loss, having key nutrients in your diet allows your body to have the proper energy to maintain healthy hair.

What does science say about summer hair growth?

Preliminary studies have shown that hair might grow faster in the summer. One study observed a group of 28 men over a period of 18 months. They noticed the slowest rate of growth occurred in January and increased through the summer. At the same time, they noticed more than double the amount of shedding in the summer compared to winter. In addition to this contradiction, the definition of “hair” was not limited to scalp follicles. The study looked at everything from beard to thigh hair. This attempt to prove hair growing faster in the summer was inconclusive, to say the least.

Since then, other studies have similarly failed to significantly prove a correlation to the rate of hair growth and the seasonality of summer. The first female-focused study was a retrospective study of women experiencing hair loss. They noted that telogen rates (periods of shedding) were lowest in late winter compared to summer. However, not enough information was collected to truly confirm whether or not hair grows faster in the summer. 

While a few more attempts have been made to answer the question of if hair grows faster in the summer, we have yet to come to a convincing conclusion. Everyone experiences hair growth differently, which makes it difficult to find patterns that can be generalized to everyone. Even when looking at the definition of summer, does that mean time of year? Month? Weather? Ambiguity in both hair growth and what classifies as “summer” make scientific consistency and clinical differences a non-stop challenge.  

Healthy hair growth year round

So according to scientific and clinical evidence, it remains inconclusive if hair actually does grow faster in the summer. That being said, there are still other ways to promote healthier, fuller hair in the summer, and all year round. In general, hair growth can be difficult and, unfortunately, the potential of summer contributing to faster growth is not a reliable solution. Turning to scientifically-proven solutions like the Hair Revival Serum is the best way to confidently tackle your hair loss and hair thinning challenges all year round.


Profile photo for David Zhang

Reviewed by: David Zhang, PhD |

David is an immunologist and bioengineer with over a decade of medical research experience. He completed his PhD at Harvard University, where he worked on developing life-saving cancer therapies. He received his undergraduate degree in immunology from McGill University and his master's degree from the University of Toronto

Written by: Revela Editorial Team |

Others enjoyed reading

Minoxidil vs. ProCelinyl™: A Tale of Two Serums

Minoxidil vs. ProCelinyl™: A Tale of Two Serums

When it comes to treating hair loss, unexpected and repurposed ingredients constantly pop up with claims to regrow hair at a fraction of the cost. Minoxidil, the active ingredient in Rogaine, is one of the most familiar—we know it beats out ingredients from your herb garden, but how does it stack up against modern, scientifically crafted solutions like ProCelinyl™?
A Shocking Trend in the Hair Loss Industry that They’re Trying to Keep Secret

A Shocking Trend in the Hair Loss Industry that They’re Trying to Keep Secret

The frustration with hair loss is an overwhelming constant: the hunt for advice, the optimism of trying new products, the ultimate disappointment that follows, and the increased distrust with each product you try. Isn't it a little strange how every brand promises improved results using the same ingredients that were used 40 years ago? Read on as we pull back the curtain on the hair loss industry.
Finasteride vs. ProCelinyl™: A Story of Side Effects

Finasteride vs. ProCelinyl™: A Story of Side Effects

You’ve likely heard of the old standbys: minoxidil, commonly branded as Rogaine, and finasteride, the generic name for Propecia. Let’s get into the basics of finasteride for hair loss and how the prescription medication stacks up to ProCelinyl™, a breakthrough ingredient that is fundamentally changing the hair loss industry.
Can Vitamin Supplements Outperform Topical Hair Serums?

Can Vitamin Supplements Outperform Topical Hair Serums?

Supplements are all the rage these days, and therefore you may have heard a few newer buzzwords emerging that make each product sound revolutionary. We’re used to nutrients and pharmaceuticals, but what are nutraceuticals, exactly? And how do they compare with ProCelinyl? Let's take a deep dive in this blog.

"Clean Beauty" is Dirtier Than You Think

You may have noticed a new buzzword popping up over the last few years: clean beauty. It sounds simple and straightforward enough, but why have the cosmetics and wellness industries jumped on the clean beauty bandwagon? Let’s take a look at some key sales metrics to see why clean is starting to overtake natural when it comes to marketing beauty products.
What are Vegan Phytoactives and Are They Effective for Hair Growth?

What are Vegan Phytoactives and Are They Effective for Hair Growth?

The inclusion of phytoactives in cosmetic formulations is a hot topic. When it comes to creating that niche though, differentiation often boils down to a question of style versus substance. Is the new angle being explored—particularly when it comes to vegan phytoactives—just a question of branding and marketing, or is there a substantial difference in the underlying product?