Matcha is a finely ground powder made from whole tea leaves. That surface area means it's much more sensitive to its environment than loose leaf or bagged tea — light, air, heat and moisture all degrade it quickly.
Good matcha stored badly will go dull, lose its vibrancy, and taste flat within weeks. Good matcha stored well can last months without much change. Here's how to do it properly.
Keep it away from light
Light breaks down the chlorophyll in matcha, which is what gives it that bright green colour and a lot of its flavour. An opaque tin is better than a glass jar for this reason. If you can see your matcha from the outside, so can the light.
Air is the enemy
Oxidation dulls the flavour fast. Always seal your container properly after each use. If your matcha came in a resealable pouch, squeeze the air out before closing. A small tin with a tight lid works well for everyday use.
Room temperature, away from heat
A cool, dry place is fine — you don't need to refrigerate matcha, and in fact you should avoid it unless the container is completely airtight. Condensation is worse than warmth. Keep it out of the spice cabinet above the stove.
Use it within 4–8 weeks of opening
Once opened, matcha is best used within 4 to 8 weeks. Unopened, ceremonial grade matcha in a sealed tin can last 6 to 12 months. Check the harvest date if it's listed — spring harvest (first flush) is freshest.
Signs it's past its best
Yellow or olive-toned colour, a flat or hay-like smell, and a bitter rather than umami-forward taste all suggest the matcha has oxidised. It's still safe to use, just better suited to cooking or baking at that point.
