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How to Cold Brew Japanese Green Tea - The Expert Advice

If you’re a tea lover, why not try cold-brewing your next pot of Japanese green tea? Cold-brewing green tea might sound complicated if you haven’t tried it before, but it’s actually a simple process that results in a uniquely sweet, smooth tea.

Cold brewing also offers several unique health benefits that you won’t get if you brew your tea with hot water.

Keep reading to learn all about the process and benefits of cold-brewing Japanese green tea!

This article is for cold-brewing sencha loose-leaf green tea. If you want to learn more about cold-brew matcha (powder), click here. If you don't know the difference between sencha vs matcha, click here to find out!

What Makes Cold Brewing Different?

As the name implies, cold brewing means the tea is brewed with cold water instead of hot water.

One of the main differences between cold and hot brewing is that cold brewing takes quite a bit longer. While a cup of hot tea is ready to drink within five minutes, cold-brewed green tea must steep for several hours.

Although this long brewing time can be annoying if you want to drink your tea right away, you can get around the wait by making a large pot of cold-brewed tea before you go to bed and letting it steep overnight.

Then, you’ll be able to sip on the finished product throughout the next day!

Health Benefits Of Cold Brew Green Tea

Even though it takes longer to cold-brew green tea, it’s worth the wait.

Tea brewed without any heat tastes different from traditional hot tea; it’s sweeter, smoother, and doesn’t have any of the bitter notes that you can sometimes taste in a cup of hot tea.

This is because cold water doesn’t extract tannins, the chemical responsible for that astringent taste, from the tea leaves. If you like to add sugar to your tea, you might be pleasantly surprised to find that cold-brewed green tea is already sweet enough on its own.

Cold-brewed Japanese green tea also offers a couple of distinct health benefits.

Less caffeine

First, it contains less caffeine than tea brewed with hot water, which is good news if you’re trying to avoid the jitters.

Cold water doesn’t extract much caffeine from the leaves, so you can go ahead and drink a cup of cold-brewed green tea before bed because it won’t keep you awake. (Read more about caffeine and green tea in my other article.

More antioxidants

Second, cold-brewed green tea contains more antioxidants than hot tea.

According to a video posted by Dr. Michael Greger at, a team of Italian researchers discovered that hot water destroys some of the catechins—the chemicals with antioxidant properties—in tea leaves. Conversely, cold water extracts those catechins without harming them. (Learn a lot more about catechins in this post.)

While any type of green tea is good for you, you’ll get more of its disease-fighting and anti-aging properties by choosing the cold-brewed variety.

(Read more about anti-aging and green tea in my other article.)

Cold Brewing Method 1: Using Cool Water

This method of cold brewing is called mizudashi (水だし), and it takes a while to steep—a minimum of three hours is recommended. However, the advantage of this method is that it works well for any grade of green tea. In fact, even cheaper green teas usually taste excellent when they’re brewed with cool water.

To make tea with this method, use a ratio of one to two tablespoons of tea leaves per quart of water. For a quick and convenient alternative, you can also use regular green tea bags.

Place the tea leaves in the bottom of a large container, or kyusu. (A kyūsu (急須) is a traditional Japanese teapot mainly used for brewing green tea.)

Then add the water, cover the container, and place it in the refrigerator to steep. When you're ready, give the finished pot a gentle swirl or stir before you drink it, since the stronger-flavored sediment may settle at the bottom during brewing.

My favorite way is to use a tea filter bag and loose-leaf green tea. Usually, higher-grade green tea is available in loose-leaf form and not teabag form. Here is a link from our store (or here is a link to Amazon to get one of these tea filter bags).

You can simply put green tea in the disposable tea filter bag and close the lid on the filter
tea filter bag and jar
Put it in one liter jar (1L)
Add water (filtered water is recommended)
iced green tea
Let it sit in the refrigerator for 3-24 hours
After letting it sit for 3-24 hours, stir well before drinking

To get the most out of your tea leaves, you should let them sit in the refrigerator for at least three hours. But you can let it steep for up to twenty-four hours for a stronger brew if you want.

Unlike hot tea, cold-brewed tea won’t get bitter the longer you steep it. Therefore, many people like to let their tea steep overnight with this method so they can drink it in the morning.

If you keep it for more than one or two days, it gets too bitter, and the water starts to turn brown. With that in mind, it's best to take out the tea bag after 24 hours if you intend to keep it for longer than two days.

Question: Is it possible to reuse the tea leaves for multiple batches of cold green tea, or do you have to change the tea leaves for every batch?

Answer: I do not personally recommend it.
After 24 hours, the tea does not produce a good taste anymore as it has been soaked too long in the water.

Cold Brewing Method 2: Using Ice

Cold Brew Tea

This is another simple way to cold-brew green tea.

The advantage of this method is that it produces a tea with a very light, delicate taste. This steeping method works best for high-quality teas that are naturally flavorful, so you may want to use a good loose-leaf tea instead of a regular tea bag.

  • To make cold-brewed green tea with ice, place one to two tablespoons of loose tea leaves in your pot or kyusu.
  • Then, fill the pot the rest of the way with ice and let it sit undisturbed.
  • When the ice has melted, your tea will be ready to drink.
  • If you aren't using a kyusu, strain the leaves through a mesh sieve or cheesecloth before you serve the tea.

Here is an Instagram video of my good friend Danielle from Tea & Me Blog doing this cold-brewing using our Gokuzyo Aracha Sencha Tea!

Cold Brewing Method 3: Cooling Hot Tea

iced green tea

Cold brewing can be a lengthy process. But if you're impatient to drink your tea, you can just brew a quick cup of hot green tea and then cool it with ice. This method works equally well with loose-leaf tea and tea bags.

One thing to keep in mind, however, is that the ice will water down the tea, so you may want to make your tea stronger than you normally would. Try doubling the number of tea leaves you use or using two tea bags instead of one.

Simple Japanese Green Tea Soda (炭酸割り)

Rather than steeping the entire hot tea, follow the steps below to make refreshing Japanese green tea cold brew soda.

  • Pour hot water over loose-leaf green tea with 1/4 of the amount of hot water you would use in method three above. (Just enough to cover the leaf is good enough.)
  • Wait for 1-3 minutes. At this point, you have very thick green tea since you used very little hot water in step one above.
  • Now pour club soda or carbonated water of your choice over the tea prepared in steps one and two. (My personal favorite is Perrier; their lime version goes surprisingly well with sencha green tea.)
  • Filter it out and add ice. If you wish, add a sweetener of your choice (honey, sugar, etc.). Check out this article for 10 ways to sweeten Japanese green tea.

This simple step makes a very healthy cold-brewed green tea soda. Pretty cool, isn't it? You can do the same trick with matcha, too. Click here for the matcha version. (It's a little different, but the concept is the same.)

Bonus Notes on Cold Brew Green Tea

Don’t throw out those tea leaves after you make a pot of cold-brewed green tea!

Most tea leaves can be used more than once, especially if you’re not using hot water. But keep in mind that your second pot of tea may have a lighter flavor than the first. If you are using a kyusu, it will filter the loose-leaf tea for you. If not, you can strain the tea through cheesecloth or a fine-mesh sieve to remove the leaves.

Some people like to brew two batches of tea with the same leaves and then mix them together. The different flavors of the two brews combine to produce a well-rounded cup of tea. Experiment with your brews to see what you like best.

If you’re interested in expanding your tea horizons, make cold-brew green tea the next thing on your to-do list. A cold-brewed cup of Japanese green tea makes a delightful morning ritual or afternoon pick-me-up, and it’s healthier than regular hot tea, too.

Why not try making your first cold-brewed pot of tea today?

This article was first published in 2017, and it was updated in 2021 just for you.

Buy Green Tea Good for Cold-Brewing

Here is a list of the best-selling Japanese green teas good for cold brewing from the Japanese Green Tea Company. Try it out today to enjoy tasty and healthy Japanese green tea!

Option 1. Using Loose Leaf Sencha Green Tea: This is an economical and high-quality green tea that is popular for cold-brewing.

Option 2. Using Tea Bags: Use 2-3 tea bags per 1 jar (one liter of water).

More Premium Japanese Green Tea On Sale

• Disclosure: I only recommend products I would use myself, and all opinions expressed here are my own. This post may contain affiliate links that I may earn a small commission at no additional cost to you.
The commission also supports us in producing better content when you buy through our site links.
Thanks for your support.
- Kei and Team at Japanese Green Tea Co.

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