You found a box of tea bags at the back of the cupboard that expired two years ago. There is also a pitcher of iced tea you brewed three days ago sitting in the fridge, and you vaguely remember making a jar of sun tea last weekend that might still be on the counter. Which of these is still safe to drink?
Does tea go bad?
The short answer: It depends on the form. Dry tea bags and loose leaf tea do not go bad in a food safety sense unless they absorb moisture and develop mold. They simply lose flavor over time. Brewed tea is perishable. It should not sit at room temperature for more than 8 hours and lasts 3 to 5 days refrigerated. Sun tea brewed in sunlight at room temperature is a genuine food safety risk that the FDA and CDC both advise against.
For more on whether tea belongs in the refrigerator, see Does Tea Need to Be Refrigerated? For our cold-brewed peach mint iced tea recipe, cold brewing in the refrigerator is both the safer and more flavorful method.
For a complete reference on storing over 100 foods, see our Food Storage Guide
Key Takeaways
- Dry tea bags sealed: 18 to 36 months per USDA
- Dry tea bags after opening: 6 to 12 months best flavor
- Loose leaf tea sealed: 1 to 2 years; 6 to 12 months after opening
- Brewed tea at room temperature: 8 hours maximum
- Brewed tea refrigerated: 3 to 5 days in a sealed container
- Cold brew tea in the refrigerator: safe and recommended over sun tea
- Sun tea at room temperature: food safety risk; FDA and CDC advise against it
- Mold or off odor in dry tea: discard; flat or weak flavor alone is not a safety concern
- Pu-erh and aged dark teas: exception: these improve with proper aging
Dry Tea vs. Brewed Tea: Two Completely Different Rules
Dry tea and brewed tea require completely different storage thinking. Understanding the distinction prevents both unnecessary waste and genuine food safety mistakes.
Dry tea, whether tea bags or loose leaf, is a shelf-stable product with very low moisture content. Without moisture, bacteria cannot grow. Dry tea does not expire in a food safety sense. The date on the package is a quality indicator, not a safety cutoff. Old dry tea tastes flat and weak, but it will not make you sick unless moisture has entered the package and caused mold.
Brewed tea is a different category entirely. Once you add water, tea becomes a perishable beverage that supports bacterial growth. Temperature, time, and container cleanliness all matter. Treating brewed tea like a shelf-stable product is where food safety problems begin.
How Long Does Tea Last?
| Type | Sealed/Unopened | After Opening | Refrigerator |
|---|---|---|---|
| Tea bags | 18 to 36 months | 6 to 12 months best flavor | Not needed |
| Loose leaf tea | 1 to 2 years | 6 to 12 months best flavor | Not recommended |
| Brewed tea (hot method) | N/A | 8 hours max at room temperature | 3 to 5 days sealed |
| Cold brew tea | N/A | Brew in fridge only | 3 to 5 days sealed |
| Sun tea | N/A | Not recommended by FDA or CDC | Refrigerate immediately; use same day |
Dry tea figures per USDA. Brewed tea room temperature limit per Washington State University Extension and Iowa State University Extension, both citing CDC guidance. Refrigerated brewed tea figure per Iowa State University Extension.
Why Dry Tea Loses Flavor but Stays Safe
Dry tea loses flavor over time but stays safe to drink as long as it remains dry. The quality decline is a chemical process, not a safety one.
Dry tea loses quality over time through the same process that affects coffee: oxidation of the volatile aromatic compounds and essential oils that give tea its flavor, aroma, and health benefits. Polyphenols, catechins, and terpenes all degrade gradually when exposed to oxygen, light, moisture, and heat.
Tea bags degrade faster than loose leaf because the tea inside has been broken into small pieces, increasing surface area exposed to air. This is the same reason ground coffee goes stale faster than whole beans. Loose leaf tea, especially when stored whole and sealed, degrades more slowly.
One important exception: pu-erh tea and certain aged dark teas from China do not follow these rules. These teas improve with controlled aging and fermentation, similar to fine wine. A properly stored pu-erh can develop richer, deeper flavor over years or even decades. For all other teas, however, older means flatter.
Tea is also hygroscopic: it actively absorbs moisture and odors from its surrounding environment. A box of tea stored near spices, coffee, or strong-smelling foods will pick up those aromas. Airtight storage in a cool, dark, odor-free location preserves flavor significantly better than an open box on a pantry shelf. For loose leaf tea specifically, opaque tin canisters with tight-fitting lids are the best vessel. Glass jars work if stored in a dark cupboard, but clear glass on a counter exposes tea to light all day. Paper bags are the worst option for long-term storage. For green tea specifically, see our notes on the health benefits of green tea and why freshness matters for its antioxidant content.
Brewed Tea: The 8-Hour Rule
Brewed tea at room temperature should not be held for more than 8 hours. This figure comes from Washington State University Extension and Iowa State University Extension, both citing CDC guidance on iced tea safety. After 8 hours, bacterial counts in brewed tea can reach levels that pose a genuine health risk, particularly for vulnerable populations including the elderly, immunocompromised individuals, and children.
The tannins in tea provide some natural antimicrobial protection that makes tea more resistant to bacterial growth than plain water. However, this protection is not unlimited. At room temperature, particularly in warm kitchens, bacteria multiply rapidly in brewed tea after a few hours.
Refrigerated brewed tea lasts 3 to 5 days in a sealed container. Iowa State University Extension recommends consuming refrigerated iced tea within three days for best safety and quality. After five days, discard regardless of appearance or smell. Sweetened tea, which provides additional nutrition for bacteria, should be treated with extra caution and consumed within three days. Tea with milk, cream, or honey added should be treated like any dairy-containing beverage and consumed within 1 to 2 days. Note that the 8-hour room temperature guideline above reflects commercial food service standards cited by university extensions; properly brewed home tea in a clean sanitized container is generally safe refrigerated for 3 to 5 days.
Sun Tea: A Genuine Food Safety RiskSun tea, made by placing tea bags in water and leaving the jar in sunlight for several hours, is a beloved summer tradition. It is also a food safety risk that the FDA and CDC both advise against. The problem is temperature. Sunlight warms the water enough to brew tea, but does not bring it close to the 175 degrees Fahrenheit needed to kill bacteria. The water stays in the temperature danger zone (40 to 140°F) for hours, which is the ideal environment for bacterial growth. University of Iowa Extension and Washington State University Extension both confirm that multiple bacteria can grow in sun tea, including Alcaligenes viscolactis, Klebsiella, Enterobacter, and in some cases E. coli. Herbal teas are at even higher risk because they lack the caffeine found in true teas, which provides modest antimicrobial properties. The FDA spokesperson has stated: “The tea may not reach temperatures high enough to kill harmful bacteria.” If sun tea is a tradition you are not willing to give up, at minimum refrigerate it the moment brewing finishes and consume it the same day. A safer alternative with the same flavor profile is cold brew tea steeped in the refrigerator for 6 to 12 hours.
How to Tell If Tea Has Gone Bad
The signs are different for dry tea and brewed tea.
Signs Tea Has Gone Bad
See also
- Visible mold on dry tea: Dry tea that has absorbed moisture can develop mold. Any fuzzy growth on tea bags or loose leaf means discard the entire container.
- Musty or off smell in dry tea: Fresh dry tea smells of its variety. A musty, moldy, or otherwise unpleasant smell means moisture has entered. Discard.
- Brewed tea past 8 hours at room temperature: Discard without tasting. You cannot reliably detect bacterial growth by smell or appearance in brewed tea.
- Cloudy brewed tea with off odor: Some cloudiness in iced tea is normal: tannins precipitate when hot tea cools quickly. Cloudiness combined with a sour or off smell, however, indicates spoilage. Discard.
- Ropy or syrupy consistency in brewed tea: This is a clear sign of bacterial growth, specifically Alcaligenes viscolactis. Discard immediately and sanitize the container.
- Flat, weak, or cardboard flavor in dry tea: This is a quality issue, not a safety issue. Old but dry tea is safe to drink. It simply will not taste good.
Storage Best Practices
- Store dry tea in an airtight container in a cool, dark, odor-free cupboard
- Keep away from the stove, coffee, spices, and direct sunlight
- Do not refrigerate dry tea: condensation from temperature changes accelerates staling
- Brew with water at 175°F or above to eliminate bacteria from the leaves
- Refrigerate brewed tea within 2 hours of brewing
- Use clean, sanitized pitchers and containers for brewed tea
- Do not brew sun tea; use the cold brew refrigerator method instead
- Label brewed tea containers with the brew date
Further Reading
Does Tea Go Bad FAQ
Can you drink expired tea bags?
Yes, in most cases. The expiration date on tea bags is a quality indicator, not a safety cutoff. Tea bags that have been stored in a cool, dry, sealed environment are generally safe to drink past their date, though the flavor will have faded. The exception is any tea that has absorbed moisture: check for mold, a musty smell, or clumped tea inside the bag before brewing. If the bag looks and smells clean, it is safe. If it smells off or shows any mold, discard it.
How long does brewed tea last in the fridge?
Brewed tea lasts 3 to 5 days in the refrigerator in a sealed container per Iowa State University Extension guidance based on CDC recommendations. For sweetened tea, which provides more nutrition for bacteria, staying within 3 days is the safer practice. Label your pitcher with the brew date. Discard after 5 days regardless of appearance. If the tea smells sour, looks syrupy or ropy, or has been left out at room temperature for more than 8 hours before refrigerating, discard it immediately.
Is sun tea safe to drink?
Sun tea carries a genuine food safety risk. The FDA does not recommend brewing tea in sunlight because the water temperature stays in the bacterial danger zone (40 to 140°F) for hours without reaching the 175°F needed to kill bacteria. University of Iowa Extension and Washington State University Extension both confirm that bacteria including Alcaligenes viscolactis and E. coli can grow in sun tea. The safer alternative is cold brew tea steeped in the refrigerator for 6 to 12 hours, which produces a smooth, less bitter flavor and carries no food safety risk.
Why is my iced tea cloudy?
Cloudiness in iced tea is usually caused by tannins precipitating out of solution when hot tea cools too quickly. This is a cosmetic issue, not a safety one. To prevent it, let hot brewed tea cool to room temperature gradually before refrigerating, or add cold water to dilute the concentrate before chilling. Cloudiness alone is not a sign of spoilage. However, cloudiness combined with a sour or off smell, or a ropy and syrupy texture, indicates bacterial growth. Discard the batch and sanitize the container before the next use.
Does herbal tea go bad differently from regular tea?
The same basic rules apply, with two differences. First, herbal teas are not true teas from the Camellia sinensis plant. They are infusions of herbs, flowers, fruits, and spices, which means their volatile aromatics tend to fade faster than those in black or green tea. Most herbal teas taste best within 6 to 12 months of opening. Second, herbal teas lack the caffeine found in true teas, which provides modest antimicrobial properties. This makes brewed herbal tea slightly more susceptible to bacterial growth than caffeinated tea, and it is an additional reason to avoid sun-brewing herbal varieties specifically.
How long does bottled iced tea last?
Commercially bottled iced tea is a shelf-stable product and typically lasts 18 to 24 months at room temperature when stored properly away from heat and direct light. The date printed on the bottle is a best-by date for quality, not a safety cutoff. Once opened, bottled iced tea should be refrigerated and consumed within 7 to 10 days. The high sugar content in sweetened bottled tea can accelerate fermentation once opened, so keeping it sealed and cold between uses is important. Discard any opened bottled tea that smells off, tastes sour, or has been open for more than 10 days.
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