---
title: 'Storing tea'
url: 'https://howtotea.me/brewing/basics/storage'
markdown: 'https://howtotea.me/brewing/basics/storage.md'
lang: en
date: '2026-10-23'
description: 'How to store tea at home: green tea cold and airless, oolong by roast level, white tea and pu-erh for aging. Limits from the Chinese standard.'
---

# Storing tea 存茶

 Editors · October 23, 2026, updated October 25, 2026 · 11 min read

Dry tea soaks up moisture and stray odors, and light and warmth strip its aroma. Keep [green tea](https://howtotea.me/teas/green) cold and airless, roasted [oolong](https://howtotea.me/teas/oolong) simply in a dry caddy, and [pu-erh](https://howtotea.me/teas/dark/puer) in a cupboard with a little air.

 ![A lidded clay jar for storing pu-erh](https://howtotea.me/images/c/o/v/e/r/cover-587144fd.webp) Photo: [Shizuha](https://commons.wikimedia.org/wiki/File:Chaju_shizuhaused_14.jpg), [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0), cropped 

存茶

Storage

cún chá

 What spoils tea: moisture, light, heat, oxygen, odors

Green and yellow: up to 10 °C, humidity up to 50%

Oolong, black, white: up to 25 °C, humidity up to 50%

Dark and pressed: up to 25 °C, humidity up to 70%

Moisture in the leaf: 3–5%; mold above 10%

Source of figures: Chinese standard GB/T 30375-2013

Finished tea is nearly dry: the leaf holds 3–5% water[1](#fn:1). It readily soaks up moisture and odors from the air, and once the leaf reaches about 10% moisture, mold sets in. Cai Xiang, in his *Record of Tea* (11th century), fit the storage rules into one sentence: tea likes bamboo leaves, fears fragrant medicines, likes warmth and dryness, and avoids damp and cold. His point about cold is disputed; the rest still holds.

For storage, teas fall into two groups. Some types are kept from changing at all: green, yellow, light oolong, Japanese [sencha](https://howtotea.me/brewing/methods/sencha-gyokuro). Others are aged on purpose: sheng pu-erh and other dark teas, pressed white tea, heavily roasted oolong. The first group needs cold and no air, the second steady, moderate conditions and clean air.

## What spoils tea

Japanese tea organizations name five factors: temperature, humidity, light, oxygen and foreign odors. A Chinese review lists four, treating odors separately, and the figures agree.

- **Moisture.** At 3–5% water in the leaf, oxidation is slow; at 10%, mold appears.
- **Heat.** Green tea in foil keeps its quality for 12 months at −10 °C, about 8 months at 4 °C and about 4 months at 25 °C.
- **Oxygen.** With less than 0.1% O₂ left in the pack, color, taste and aroma hold; above 5%, quality drops fast.
- **Light.** In clear glass, 10–20% of the vitamin C is lost in 10 days. Chlorophyll breaks down into brown pheophytin; at room temperature in summer, about 26% goes in three months.
- **Odors.** Xu Cishu (16th century) warned that beside food, incense and seafood, tea "turns yellow and changes in a single night."

You can see spoilage in the color: emerald green tea turns yellow-brown, and black tea loses its sheen. The liquor darkens, the astringency fades, and a stale smell creeps in.

## General rules

Keep tea somewhere dark, dry and odor-free, away from the stove, spices, coffee and household chemicals. A glass jar on an open shelf looks good but lets in light.

Buy in small amounts. The Tokyo tea merchants' association advises packs of 100–200 g that you finish in two weeks to two months, and two 100 g packs beat one 200 g pack. Split a big purchase into portions right away and keep only a few days' supply open. Choose a [caddy](https://howtotea.me/teaware/utensils/tea-caddies) that fits the amount of tea, so there is less air inside. How much leaf you use per session depends on your [dose](https://howtotea.me/brewing/basics/leaf-ratio), so size the caddy from that.

Scoop tea with a dry spoon and keep different teas apart, especially smoked and scented ones like [Zheng Shan Xiao Zhong](https://howtotea.me/teas/black/zheng-shan-xiao-zhong). Dry leaf is brittle and snaps between the fingers; damp leaf bends.

China's national standard for tea storage sets upper limits for each type[1](#fn:1). The figures were written for warehouses, but they make a fair guide at home too.

| Type | Temperature | Air humidity |
|---|---|---|
| Green, [yellow](https://howtotea.me/teas/yellow) | up to 10 °C | up to 50% |
| [Oolong](https://howtotea.me/teas/oolong) | up to 25 °C, up to 10 °C if lightly dried | up to 50% |
| [Black](https://howtotea.me/teas/black), [white](https://howtotea.me/teas/white) | up to 25 °C | up to 50% |
| [Dark](https://howtotea.me/teas/dark), pressed | up to 25 °C | up to 70% |

For dark and pressed tea, Shenzhen's local standard recommends packaging "with better breathability"; for the other types, vacuum, nitrogen and foil.

## Caddies in brief

Since the [Ming dynasty](https://howtotea.me/traditions/china/history/ming-paocha), a pewter caddy with a double "clamp" lid has been considered the most reliable vessel for tea leaf. Around 1642, Feng Kebin wrote that a porcelain pot "lets the wind in through microscopic gaps," while a pewter one does not. The seal depends on how well the lid fits, not on what the walls are made of. Tinplate caddies with a double lid do the same job for less money, and old pewter alloys sometimes contained lead, so be careful with antique caddies.

![A pewter caddy, an unglazed clay jar and a tin canister](https://howtotea.me/images/s/o/s/u/d/sosudy-180d30f8.webp)Illustration

For green tea and light oolongs, metal or opaque foil works. Pu-erh, by contrast, wants unglazed clay, which slowly trades moisture with the air. In Japan, tencha leaf is kept in a chatsubo jar that is opened in November at the kuchikiri ceremony, and sencha in a cylindrical chazutsu.

## Green and yellow tea: cold and airtight

Only a refrigerator gets down to 10 °C at home. The China Tea Marketing Association puts the working range for green and yellow tea at 0–5 °C. Packaging matters as much as the cold. In a test by Japan's national tea institute, sencha kept at 25 °C and 75% humidity spoiled at very different rates depending on the packaging:

- cellophane and polyethylene with air: about a month;
- foil-laminate pouch with air: about two months;
- gas-barrier pouch with air: about three months;
- gas-barrier pouch with nitrogen: more than six months with no change;
- metal tin with nitrogen: taste and aroma still good after a year at room temperature.

In an ordinary pouch, 70–80% of the volume is air, and a true vacuum is almost impossible: the pouch crumples and sharp leaf punctures the film. Manufacturers pump out the air and flush the pouch with nitrogen. Oxygen absorbers work slightly worse, and the gap widens over time.

At home, put the tea in a tight caddy, tape the lid seam, slip the caddy into a bag so the leaf does not pick up smells, and give it a shelf of its own in the fridge. If the caddy is not airtight, the Uji chamber advises skipping the fridge and finishing the tea in a week or two[2](#fn:2).

Condensation

Open a cold pack in a warm room and it fogs up inside, with the moisture settling right on the leaf. Take the tea out ahead of time and leave it closed until it has warmed to room temperature. Japanese producers rest tea from cold storage in an "anteroom" for a day or two. Take a few days' supply from the fridge rather than the whole stock at every session.

The freezer beats the fridge, though opinions differ. In a test on Huangshan Maofeng, color and freshness survived 150 days at −20 and −80 °C, while at 4 °C the [volatile compounds](https://howtotea.me/science/chemistry/aroma) had shifted noticeably by day 100. Uji recommends the freezer for anything longer than a few months; Tokyo allows either, as long as the pack is warmed before opening. Teas with a clean, floral aroma keep less well in a plain fridge than other teas do.

Tea that has gone flat is not always lost. In Uji, people pan-roast it into homemade hojicha.

In Zhejiang, [Longjing](https://howtotea.me/teas/green/longjing) is kept in a jar with quicklime, which draws out moisture. During the rainy season, the lime is changed once the lumps crumble to powder. Yellow tea is stored the same way as [green](https://howtotea.me/teas/green).

## Oolongs: by roast level

Light oolong is stored much like green tea. The tightly balled leaf can be vacuum-sealed, and a fresh, floral [Tie Guan Yin](https://howtotea.me/teas/oolong/tie-guan-yin) belongs in the fridge. Do not age it: an aromatic "jade green" oolong does not mature, it just goes stale and sour. Only oolong that is oxidized enough and thoroughly dried ages well.

Roasting protects the leaf. Well-roasted oolong contains about 2% moisture, green tea 5% or more. A dark oolong such as [Da Hong Pao](https://howtotea.me/teas/oolong/da-hong-pao) is fine in a tight caddy at room temperature in a dark, dry spot, and can be aged in any climate. Roasted oolong counts as aged after 20–30 years.

Taiwanese masters disagree about re-roasting. Some dry the tea every few months or every five years; others, like Global Tea Hut, never touch it, arguing that the taste turns "roasty" rather than aged. Stéphane Erler compared the same roasted Lishan from 2007, kept in a porcelain jar and in an ordinary bag. The tea from the jar came out more complex and harmonious, the one from the bag slightly fresher and simpler.

Black tea is stored like roasted oolong, in a tight caddy at room temperature.

## White tea: dry, dark, odor-free

White tea is drunk both fresh and aged. In Fuding they say: "one year it is tea, three years medicine, seven years treasure." Damp harms it either way, since damp leaf loses its aroma and smells musty. Aging calls for a dry, dark, odor-free place and tight packaging, and pressed white tea goes in a large tin.

Aging changes the chemistry. In a study of white teas from different areas, EGCG fell by 74–86% over 16 years and [theanine](https://howtotea.me/science/chemistry/theanine) dropped too, while the taste softened: bitterness and astringency faded, body and sweetness grew. The industry group standard for "aged white tea" requires at least five years of natural aging in a cool, dry, ventilated, dark place.

Older is not always better. Among white cakes aged 2–19 years, the best scores went to those in their fourth year (96.8 points), which undercuts the idea that the older the cake, the better. [Shou Mei](https://howtotea.me/teas/white/shou-mei) and [Bai Mu Dan](https://howtotea.me/teas/white/bai-mu-dan) darken under this kind of storage, and grassy notes give way to dried fruit. Silver needle, [Bai Hao Yin Zhen](https://howtotea.me/teas/white/bai-hao-yin-zhen), ages in its own way.

## Pu-erh and dark tea: air and moderate humidity

[Pu-erh](https://howtotea.me/teas/dark/puer) stays in its original paper and goes into a box, a bamboo basket or an unglazed clay jar. The Chinese standard allows up to 70% humidity for dark tea[1](#fn:1). Keep the storage away from the kitchen, the bathroom and any outside wall, where condensation gathers in winter. Keep ripe pu-erh (shu) apart from sheng, because the smell of the pile carries over to its neighbors.

The right humidity for sheng depends on whom you ask. Huang Haoran (Taiwan) advises 80–95% for young sheng for at least a month or two a year, and opening the storage rarely. Chan Kam Pong puts the optimum at 70–80% and 20–30 °C and calls 80–90% too damp. The TeaDB author considers 55–66% safe for a closed box, says to watch 67–72% closely, and calls 73% and above dangerous[3](#fn:3). At 70%, mold may take six months to appear; at 75%, a month. The safest bet is a hygrometer in the cupboard, which tells you what you actually have.

The second threat is foreign odors, which TeaDB calls the most common fault in samples that sat for years in Western pantries. The third is condensation, which collects on the bottom and walls of the box when the temperature drops.

In China people distinguish gan cang and shi cang, dry and wet storage. Kunming's dry storage ages tea slowly; the humid warehouses of Guangdong and Hong Kong speed it up. In one comparison, Guangdong batches aged faster but ended up lower in quality. In another, the Guangzhou warehouse removed bitterness better, while the Kunming one brought out more sweetness and a medicinal note. Both were judged safe.

Kunming is not as dry as its reputation suggests: its average annual humidity is about 72.5%, nearly the same as the "humid" cities. Tea ages slowly there because of the cool, since cold air at the same relative humidity carries less water. By the TeaDB "70/70" rule of thumb, if the outdoor average is at least 21 °C and 70% humidity, tea in an ordinary room ages fairly fast.

## Common questions

Can you keep tea in the fridge?

Green tea, yellow tea and light oolong can and should go there, in a tightly closed pack and away from food. Open the pack only once it has warmed to room temperature, or condensation will form on the cold leaf. Pu-erh, white tea and roasted oolongs do not need the cold.

How long does green tea keep?

Japanese tea chambers advise finishing an opened pack in 1–2 weeks and a purchase within a month or two. Sencha keeps for more than six months in a sealed nitrogen-flushed pouch and for about a year in a nitrogen-flushed tin. At home, tea stays fresh longest in the cold, but not forever, so buy green tea in small amounts.

What if a coating appears on the tea?

A white, gray or green fluffy coating and a cellar smell mean mold, and the tea goes in the trash. Yellow specks inside a broken fu zhuan brick are golden flowers (jin hua), the hallmark of [Anhua dark tea](https://howtotea.me/teas/dark/anhua).

Notes

1. GB/T 30375-2013 "Tea storage," national standard of the People's Republic of China, in force since 22 June 2014: [ChinaStandards](https://chinastandards.org/standards/gb-t-30375-2013). The type limits are known from a retelling and from the matching text of Shenzhen's DB4403/T 88-2020. Leaf moisture and thresholds: Tea Research Institute CAAS (Hangzhou), *Food and Fermentation Industries*, 2019. [↩](#fnref1:1) [↩](#fnref2:1) [↩](#fnref3:1)
2. Kyoto Prefectural Tea Industry Chamber: [How to choose tea](https://ujicha.or.jp/en/knowledge/choose/). [↩](#fnref1:2)
3. James, TeaDB: [Correcting Your Storage & Preventing Mold](https://teadb.org/correcting-your-storage-preventing-mold/), 2018. [↩](#fnref1:3)

---

## Navigation

- Parent: [Brewing basics](https://howtotea.me/brewing/basics.md)
- Previous: [Warming the teaware and rinsing the leaf](https://howtotea.me/brewing/basics/preheating-and-rinsing.md)
- Next: [Leaf size and leaf grades](https://howtotea.me/brewing/basics/leaf-grades.md)