A tea lover asked: “How long does homemade cold-brew tea last?” Cold brew is many people’s go-to choice for beating the summer heat, so questions about how to make it are quite common. Let’s chat about this topic!
How long can cold-brew tea last?
It depends on whether you mean “how long can the tea steep if the leaves are left in?” or “how long can cold-brew tea last after the leaves are removed?” The answers for these two situations are very different.
If you’re asking, “How long can cold-brew tea steep with the leaves left inside?” we recommend taking the leaves out once they reach the recommended steeping time. Because if you steep them for too long, bitter compounds and caffeine will continue to leach out, making the cold brew overly strong. Overly concentrated tea not only tastes unpleasant, but it can also easily cause stomachaches, heart palpitations, insomnia, and other issues.
Take high mountain oolong tea as an example: it tastes best when cold-brewed for 8 hours; at 12 hours, the flavor is a bit heavier but still acceptable; however, if you steep it for over 16 hours, the bitterness will fully release, making the tea intensely bitter and astringent—we truly don’t recommend drinking it!
As for “how long can cold brew tea last after removing the tea leaves?“, it depends on storage conditions. At room temperature, it is recommended to consume it within 6 hours during the summer, as bacteria easily multiply in high-temperature environments and the flavor will change. In a properly maintained refrigerator, cold brew tea can last 2–3 days without issues, but keep in mind that the peak flavor period is within 12 hours of brewing. After that, the taste and texture will gradually decline. Therefore, drinking it as soon as possible is always best!
Why can commercially available cold brew tea last for many days?
As for why commercially available cold brew tea can last for several days—and even still have tea leaves inside without being removed—this is because most bottled cold brews on the market have undergone sterilization treatment, reducing the bacteria count inside the bottle to near zero. As long as the cap is not opened, the shelf life can be extended considerably.
In addition, the amount of tea leaves in the bottle is precisely calculated, and the compounds within the leaves are fully released within the first 20 hours of steeping. Steeping them for a few more days will not change the concentration of the tea liquor, so whether the leaves are removed or not makes little difference.
If you are making cold brew tea at home, it is recommended to follow standard tea-to-water ratios and steeping times, and remove the tea leaves once brewed. When properly refrigerated, it can last for 2–3 days, but it is best consumed within 12 hours to enjoy the finest flavor of your cold brew tea!