There's nothing quite like a perfectly brewed cup of tea — but even the finest leaves won'tstay that way forever. Understanding how tea ages, what threatens its quality, and how to store it properly can mean the difference between a transcendent cup and a disappointing one.
Enemies of Tea
The enemies of tea are situations that can harm it and shorten its shelf life in terms of freshness, flavor, and health-promoting compounds. Those are air, heat, light, moisture, and strong aromas. Anything you can do to protect your loose-leaf tea from those enemies will help to protect it. Let’s look into this a bit more.
Air
Air contains oxygen. As I discussed in this post on different types of tea, oxygen catalyzes oxidation, which distinguishes black from green tea. Oxidation is necessary to create the deep, complex flavor and aroma you find in black tea. However, it is the lack of oxidation that gives green tea its fresh, vegetal flavor. Oxidation also alters some of the healthful catechins. Protecting your tea from air will help keep that tenth cup just as delicious and healthful as the first.
Heat
Storing your tea at higher temperatures can also lead to oxidation and changes in the antioxidants present in tea. Storing your tea in a cooler environment can diminish this.
Light
Exposing your tea to light can alter the color, aroma and flavor of the brewed tea. Keeping your tea in a dark place helps maximize what you want from it.
Humidity
Higher humidity can accelerate oxidation. Storing your tea in a way that lowers humidity reduces the chance of this happening.
Strong Aromas
Tea can easily absorb odors from other sources. It is how, as this post explains, the tea industry makes scented teas such as Jasmine and Lapsang Souchong. These are wonderful teas, but odors from spices, coffee and food can affect the tea’s flavor in an unwanted way.
Proper Ways to Store Tea
You should choose a method for storing your loose-leaf tea that minimizes damage from these enemies of tea. That is, protecting it from heat, light, air, humidity and strong odors.
If your tea has been sold in a bag, you can keep it in that bag as long as it is opaque and able to be sealed tightly. Although paper kraft bags are attractive, they are not the most impermeable to tea’s enemies. Even better than resealable bags are tea tins, especially if they are double-lidded. Plastic containers are not ideal, as they can retain unwanted odors.
Some people love the look of their tea in glass jars. Glass may protect from some elements, but not light. Therefore, if you choose to use glass containers, store them in a cabinet to minimize light exposure.
If you have the space, putting your tea in a dedicated space or cabinet will add another layer of protection. At a minimum, store it away from the stove and not above the refrigerator.
The practice of storing your tea, especially green tea, in the refrigerator or freezer is somewhat controversial. If the tea package is unopened, maybe even vacuum-sealed, the refrigerator or freezer is fine for storage. However, once the package has been opened, it can pick up moisture and odors if stored in the refrigerator. Another caution tea producers offer is that once you take the unopened tea out of the refrigerator or freezer, it should be allowed to reach room temperature before opening it. This minimizes the likelihood of condensation, which can degrade the tea.
Life-Span of Tea
Tea is very shelf-stable. Tea, if stored properly, doesn’t spoil or go bad in a way that will make you ill. Rather, it deteriorates in a way that harms the flavor and the healthful chemicals found in tea.
Some tea producers will put a “best buy” date on the tea. That date is the “date by which the manufacturer ensures the tea's quality is as expected for that product under correct storage conditions.” Just because it is past that date doesn’t mean the tea has gone bad. Look at the tea and smell it. If you see or smell anything funky, dispose of it. If not, brew some and taste it.
There is no hard-and-fast rule for how long tea lasts. It depends on the type of tea and, as explained above, how the tea is stored. Assuming good storage conditions, the less oxidized a tea is (such as green teas and light oolong teas), the shorter the shelf life will be.
Black and dark oolong teas should be good for at least two years. Green and light oolongs are better if consumed within a year. White tea is a bit more shelf-stable and can last one to two years. Puerh is a type of aged tea, which is better left to its own future post.
One thing to understand is that, especially with green teas, even if the flavor is fine, some of the healthful compounds may break down after six months.
A Final Word
Tea is a gift from the natural world, shaped by terroir, season, and the hands of skilled producers. Treating it with a little care at home honors that journey. When you protect your tea from light, moisture, heat, odors, and air — and enjoy it while it's at its best — every cup reflects the full intention behind those leaves.
Your tea deserves a good home. Give it one.
Have questions about the teas in your collection? I am always happy to help. Reach out — I love talking tea.