How to Store Tea: Does Tea Expire, Can Tea Bags Go Bad, and How Long Does Tea Last?

The one real exception is tea that has got damp: damp leaf can turn musty or grow mold, and then it belongs in the bin, not the pot.

We often put it this way: “Teas taste best when they’re fresh. Much like vegetable and fruit, teas do go stale over time. They lose flavor and aroma and become flat.”

How long does tea stay good?

So the useful question is not “does tea expire?” but “how long does tea stay good?” Stored well, most tea is at its best within about a year of being made. Our quality team’s tea specification, issued in April 2023, sets the outer limit: a shelf life of 24 months “under proper storage condition” for black, green, white and oolong teas, plain or flavored. Herbal tisanes get 6 to 18 months, and wellness blends 12 months.

Those two figures do not contradict each other. Twenty-four months is how long the tea stays sound and true to type; the first year is when it tastes most alive. Robust black teas hold up longer than delicate ones, and the old Tea 101 advice was that black tea can stay fresh for about two years, green and white tea for about one. The more a tea is oxidized during making, the longer it tends to keep, which is why a malty Assam outlasts a delicate green.

What the date on the pack tells you

The date printed on a pack is a best-before guide to quality, not a safety cut-off. Look for the packing or manufacturing date too: it tells you where in its life the tea is. When we redesigned our packs in 2015, we put the packaging date on every packet, along with brewing instructions and tasting notes.

The packing date is not the picking date. As we wrote in 2014, the two “are independent events.” Our tea reaches the cold store in bulk vacuum packs of about 20 kg and is “repacked in 100 gram vacuum packs” later, in batches. So a spring tea plucked in March may carry a later packing date. The leaf has been kept cold and airtight in between, which is why a later packing date does not mean older-tasting tea.

That tin held a tea still in our range, Nilgiri Havukal Winter Frost Black; its 24 months match our 2023 specification.

“Moisture, Light, Oxygen and Heat are the 4 enemies of tea.” Exposure to any of them makes tea stale and tasteless; stored right, tea keeps its flavor far longer.

• Moisture: Tea is hygroscopic: dry leaf readily absorbs water from the air, and that damp robs it of freshness fast. Kausshal Dugarr, our founder, puts it plainly: “Ensure the dry leaves do not have any moisture or off-notes as it corrodes flavor and weakens the strength of the tea. This is applicable for ALL kinds of teas and that is why it is essential to store teas correctly.”
• Light: Sunlight fades the leaf and its flavor. Tea in a clear jar on a bright shelf can lighten in color and lose its aroma.
• Oxygen: Air slowly flattens tea: oxidized leaf makes “flat tea with no flavor or briskness or astringency.” Open air also brings dust and damp.
• Heat: Warmth speeds up every change in the leaf. “Heat causes leaves to perspire and renders them tasteless,” and a hot, humid storeroom is the worst place for tea.
• Smells: Loose tea next to spices, cheese or soap can pick up their odor and develop an unpleasant flavor.

Why moisture is the one to watch

Of the four, moisture does the most damage, and it is the hardest to keep out. Our 2015 freshness story called it “one of the biggest ones to tackle”: teas “go rapidly stale in the presence of excess moisture.” It is also the test that tea arriving at our facility fails most often. In our quality index, straight teas passed every other check, from foreign matter to sensory, far more reliably than they passed on moisture. If carefully made tea can pick up damp between factory and warehouse, a tin left open beside a steaming kettle has little chance.

Which teas fade first

Delicate teas show the damage first. A Darjeeling first flush, a green or a white tea gets most of its charm from fragile, fresh aromas, and those are the first to go.

The shape of the leaf matters too. In our own notes on tea making, “the more tightly rolled, the better the leaf’s ability to retain freshness.” A tightly rolled oolong or a wiry orthodox leaf shows little surface to the air. Small broken leaf, the kind in most tea bags, shows a great deal, so it stales faster.

The middle column is when each tea tastes most like itself. The right-hand column is the shelf life our quality team’s April 2023 specification gives for each type, kept sealed in “a cool, dry place.”

Two habits matter more than any table. Buy amounts you will drink in a few months, especially for green, white and spring teas; a trial pack of small packs lets you try many teas while each is fresh. And save the long keepers for the long haul: a malty Halmari Summer Black from Assam will hold up longer than a spring green.

How old is “fresh” when you buy? Our writer Peter Keen found that a Darjeeling can take anything from “two weeks or less (best-practice logistics) to around six months (standard practice)” to reach a buyer abroad. In 2017 he noted that China teas sold in the US and Europe “are over a year old and packaged consumer brands as much as two.” So a tea can spend much of its best year in transit before it reaches your cupboard. For when each flush is made, and so how old a “fresh” tea really is, see Seasons of tea.

Most ordinary tea bags hold small broken leaf, which has far more surface exposed to air, so they tend to lose aroma sooner than whole leaf. The bag itself does not help. As our founder wrote when we launched our own, “in the time it takes to fill, produce and ship the average tea bag, the quality of the tea has already deteriorated,” because “the tea is continuously exposed to air and therefore affected by moisture and oxygen.” Many tea bags carry no date at all; in 2016 one of our writers found that only a few firms print “best used by” on them, and that the average shelf life given was two years.

Why individually sealed bags keep best

Individually sealed bags keep best. We started in 2012 with loose leaf only and held back from tea bags until we could keep them fresh: our TeaPacs, launched in October 2016, were packed in their own sachets sealed at source with a natural nitrogen flush.

The idea came from an unlikely place. “Potato chips! That was the A-ha! moment,” our founder wrote: chip makers use nitrogen, an inert gas that “preserves freshness by displacing all other gases,” and our team spent six months of trials adapting it to single-serve packets of whole leaf tea. The full story is in Introducing TeaPacs – Groundbreaking innovation from Teabox. The first range came in 18 flavors, from English Breakfast to spiced blends. See our tea bags.

A sealed sachet means each bag meets the air only when you open it. Keep unopened sachets in their box, in the same cool, dark cupboard as your loose leaf, and use any opened one straight away.

1. Smell the dry leaf: Fresh tea has a clear, lively aroma as soon as you open the pack. Stale tea smells of very little, or of cardboard and dust. A musty, damp or moldy smell means throw it away.
2. Look at it: Leaf that has faded, gone grayish or lost its sheen has probably seen too much light or air.
3. Feel it: Dry tea should be crisp. Leaf that feels soft or clumps together has taken on moisture.
4. Brew it: Make a cup with the usual leaf, water temperature and time. A flat, dull cup with little aroma means the tea is past its best.

Our tasters judge incoming lots the same way, only more strictly. Each lot is checked for moisture and scored in a sensory test, and it must score above 7 to pass. At home you only need your nose and one honest cup.

Check the brew before you blame the tea

Water that has been reboiled, or is far too hot for a green tea, can make even fresh leaf taste tired. “One of the most common complaints about tea is that it is too bitter. This is almost always because of the water, not the tea.” See How to brew loose leaf tea and our story on getting the water right.

A dry, dedicated scoop such as the Ideal Teaspoon also helps: a damp spoon dipped into the tin is one of the most common ways moisture gets in.

Is it safe to drink old tea?

Dry tea that has been kept sealed, cool and dry is generally fine to drink after its best-before date; it will just taste flatter. If it smells musty or shows any sign of mold, do not drink it. Stale but sound leaf still makes a decent strong, milky chai, where the spices and milk carry the cup.