How Long Does Baking Powder Last?
Chemical leavening agent used in baking, containing baking soda, cream of tartar, and a buffer.
The Short Answer
At room temperature in the pantry, expect 180–365 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
Baking powder that has lost its leavening power will not make you sick, but your muffins will come out flat as hockey pucks. Test it before starting a recipe by dropping a teaspoon into hot water. Strong bubbling means it is good. Weak fizz means it is time for a new can.
How to Store Baking Powder
Store in a cool, dry place with the lid tightly closed. Moisture is the enemy; never use a wet spoon in the container. Keep away from the stove and dishwasher where steam and heat can activate the powder prematurely.
How to Tell if Baking Powder Has Gone Bad
Look for these signs that baking powder has spoiled: baking powder does not become unsafe but loses potency. test by adding 1 teaspoon to 1/3 cup hot water. if it bubbles vigorously, it is still active. if it barely fizzes, replace it.
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
Add 1 teaspoon of baking powder to 1/3 cup of hot water. Active baking powder will bubble vigorously and immediately. If it barely fizzes, it has lost its leavening power and should be replaced.