KeepsUntilSearch My fridgeBaked Goods · USDA FoodKeeper

How long does Baking soda last in the pantry once opened?

Once opened · in the pantry

Use by6 months

Counted from the day you opened it

Quality window · past it, judge it yourself

How this date is worked out

From KeepsUntilIt is past the dateWhat to do when the window has run out, and when tasting is not a test Where these numbers come fromThe USDA source, the parse rules and what this site cannot tell you Every food on the siteOne page, every product, longest first

Turning the range into a date

Baking soda keeps 6 months in the pantry once opened. Two clocks run on this item: one from the day it went into storage and one from the day the seal broke. Both are listed below, 2 rows in all.

Unopened · in the pantryUse by2 years to 3 years after the day you bought it
Once opened · in the pantryUse by6 months after the day you opened it

Unopened · in the pantry

2 years to 3 years

Counted from the day you bought it

6.1×

What opening the package costs1095 days sealed in the pantry ÷ 180 days open in the pantry

What opening the package actually costs

Opening the package is the decision that settles this page. Sealed, the item holds 3 years sealed in the pantry; once open it holds 6 months open in the pantry, the same food measured in months instead of years, a drop of 6.1 times. It stands 1 of 52 on its shelf, one step above Spice/spices at 3 years.

Every storage figure the USDA publishes for this item

The USDA rates this item in the pantry and nowhere else, one of 84 foods of the 466 it files that way. Within Baked Goods it is filed under Baking and Cooking.

Unopened · in the pantry2 years to 3 years
Once opened · in the pantry6 months

Can you freeze baking soda?

The USDA prints no freezer time for baking soda. Frozen at 0 °F any food stays safe; whether it is still good after thawing is a matter of quality. Keep the fridge at 40 °F or below and the freezer at 0 °F.

From KeepsUntilWhere these numbers come fromThe USDA source, the parse rules and what this site cannot tell you

How to tell if baking soda has gone bad

Go by the date first: baking soda keeps 6 months in the pantry once opened. Insects, a musty or rancid smell, clumping from damp, or a swollen can mean it goes out. Any dish you cook with it follows the 2-hour rule, 1 hour above 90 °F.

Sources: USDA FSIS: the danger zone USDA FSIS: freezing 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 6 months in the pantry once opened. The USDA rating this place at all is the USDA saying Baking soda keeps there, so 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 Baking soda past its 6 months in the pantry once opened window. Past that the calendar stops deciding and the food itself does. Mold takes the whole package out rather than the slice it grew on, and so does a musty or old-oil smell in a flour or a mix.

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

Every one of the 6 nearest items keeps the same or less, 2 years to 3 years against the 3 years of this item, which makes it the durable end of the cluster.

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.

USDA index terms: baking, soda

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.