Tea very rarely goes bad in a way that would hurt you. It goes flat, which is worse in practice, because you keep drinking it and slowly forget what it was supposed to taste like.
The four enemies
Air, light, heat and smell. In that order of how much damage they do.
- Air oxidises the leaf and dulls aromatics. Airtight, and a smaller container as the tin empties.
- Light degrades it fast. Opaque, not the beautiful glass jar on the windowsill.
- Heat accelerates everything. Not above the stove, not on top of the fridge.
- Smell transfers straight into the leaf. Tea is a deodoriser — do not store it next to spices or coffee.
The clear glass canister on the counter is the single most common and most destructive storage choice in tea. It is also the prettiest. Decant into it for a few days at a time, and keep the bulk in the dark.
How long each type actually lasts
Green tea is the one with a real clock on it — six to twelve months, and a Japanese green loses its freshness noticeably within a few months of opening. Buy it by harvest year and buy small amounts.
White and oolong hold up better, a year or two. Black tea is comfortably good at two years. Pu-erh is the outlier: properly stored, it is actively supposed to change over decades, and that is the point of it.
The refrigeration question
Japanese green tea genuinely benefits from cold storage in a sealed, opaque pouch. Everything else generally does not, and the risk is condensation: a cold tin brought into a warm room pulls moisture onto the leaf when opened.
If you do refrigerate, let the container reach room temperature before opening it. Never refrigerate pu-erh — it needs to breathe.
Common questions
Does loose leaf tea expire?
It does not become unsafe, but it fades. Green tea loses its character within six to twelve months; black and oolong hold for one to two years; pu-erh improves for decades when stored properly.
Should you refrigerate green tea?
Japanese green tea, yes — sealed, opaque and airtight. Let it come to room temperature before opening so condensation does not settle on the leaf. Other teas generally do not benefit.
What is the best container for loose leaf tea?
Airtight, opaque and appropriately sized — a steel or tin canister with a tight seal. Clear glass on a sunny counter is the worst common choice despite being the most attractive.