How Long Does Baking Soda Last?
Sodium bicarbonate, used as a leavening agent in baking and for household cleaning.
The Short Answer
At room temperature in the pantry, expect 180–730 days under normal conditions. These times are based on USDA food safety guidelines and assume proper storage conditions.
Storage Times at a Glance
Source: USDA FoodKeeper | Last verified: March 26, 2026 | Our methodology
The baking soda absorbing odors in your fridge is doing its job, but that means it is also absorbing flavors you do not want in your cookies. Keep a separate, sealed container of baking soda for baking and replace it every 6 months.
How to Store Baking Soda
Store in a cool, dry place with the box or container closed. Baking soda absorbs odors and moisture from the air, which reduces its effectiveness as a leavening agent. The box in your fridge for odor absorption should not be the same one you bake with.
How to Tell if Baking Soda Has Gone Bad
Look for these signs that baking soda has spoiled: baking soda does not become unsafe but loses potency for baking. test by adding a spoonful to vinegar; it should fizz vigorously. baking soda used for cleaning or deodorizing works even when it is old.
The Professor's rule: When in doubt, throw it out. No meal is worth food poisoning.
The Bottom Line
Always store in airtight containers, refrigerate within 2 hours of purchase or preparation, and trust your senses. If something looks, smells, or feels off, discard it regardless of how many days it has been.
Frequently Asked Questions
Baking soda does not become unsafe, but it loses its leavening power over time, especially if exposed to moisture and air. For baking, replace every 6 months. For cleaning, it works indefinitely.