Miso keeps about 1 year in the fridge at 40°F (4°C) or below, counting from the day you bought it.
That's the longest window published for Miso — sealed in the fridge is its best case.
| Situation | Keeps for |
|---|---|
| Unopened · fridge | 1 year |
| Freezer | Not recommended |
Air and warmth are what shorten an opened item's life — the right container buys back the days the packaging gives up once the seal's broken.
Keep Miso fresh longer ↗ Need a fresh one? ↗
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About 1 year at 40°F (4°C) or below, according to USDA FoodKeeper v128. That window runs from the day you bought it — FoodKeeper publishes no separate after-opening figure for this one.
Yes — keep Miso at 40°F (4°C) or below. Refrigerate at 40°F (4°C) or below.
Look for: Sour or off smell; A slimy or sticky surface; Mould or discoloration; Cloudy or fizzing packing liquid. Those are the general signs for vegetarian proteins — USDA FoodKeeper v128 publishes no spoilage note for Miso specifically. Never taste something to test it — when in doubt, throw it out.
USDA FoodKeeper v128 does not recommend freezing Miso — it survives but the texture or quality suffers badly.