How long does Miso last in the fridge?
Turning the range into a date
Miso keeps 1 year sealed in the fridge. Counting 1 year forward from a date is not arithmetic anyone does reliably in their head. Give the field the day it went into storage.
- Unopened · in the fridgeUse by1 year after the day you bought it
Why the freezer is not an option here
The USDA marks the freezer as not recommended for this item, so the whole answer is a single field: 1 year in the refrigerator from the day of purchase. It is not a warning: food held at 0 °F stays safe, so a not-recommended is a verdict on what would come out of the freezer.
Every storage figure the USDA publishes for this item
The refrigerator is the only place the USDA gives this item a storage time, as it does for 64 of the 466 foods the USDA lists.
- In the freezernot recommended
- Unopened · in the fridge1 year
Can you freeze miso?
The USDA does not recommend freezing miso. It is not a safety warning, since food held at 0 °F stays safe, but it comes back changed. Keep the fridge at 40 °F or below and the freezer at 0 °F.
How to tell if miso has gone bad
Go by the date first: miso keeps 1 year sealed in the fridge. An off smell, mold or a slimy film mean it goes out, but leftovers can carry harmful bacteria with none of those signs, so the calendar decides first. Never taste to test.
Sources: USDA FSIS: the danger zone USDA FSIS: freezing and food safety USDA FSIS: leftovers and food safety FDA: are you storing food safely FoodSafety.gov: the FoodKeeper app.
Is it still safe to eat, or just past its best?
The answer at the top of this page reads 1 year in the fridge. Miso does spoil, but a bacterial limit runs in days and this window runs past six weeks: the figure rates how good it will be. Past it, whether it has gone bad is yours to judge by look and smell: this window rates quality, not the day it turns hazardous.
It is past the date. Now what?
Say the calculator above puts Miso past its 1 year in the fridge window. Past that the calendar stops deciding and the food itself does. Mold, a slimy or sticky surface, soft or darkened spots, or a sour smell mean it goes out whatever the date says.
The whole rule, including the cases the source does not cover, is set out under what to do when the date has passed.
Items that behave the same way
The 3 items below are the closest match to this item by storage behavior, running 1 week to 2 years and bracketing its 1 year.
Where these numbers come from
Every storage time on this page is the USDA’s own published figure from the FoodKeeper data, one of the 9 it keeps per food, reproduced unchanged and never an estimate of ours. Where the USDA lists several kinds under one name, each kind keeps its own windows, and the page names the kind its answer is for. The dates and multipliers are ours, computed from those ranges.
Source: USDA FoodKeeper, retrieved 1 September 2026. Found a figure that does not match the source? Tell us on the contact page. How the site is built is on the method page.
KeepsUntil is an independent reference built on public USDA data. It is not affiliated with, endorsed by, or connected to the U.S. Department of Agriculture or the Food and Drug Administration. Whether a given window is a safety limit or a quality window is stated on the page that prints it.