Expiration & Storage Tips
When does baking powder expire?
Unopened, baking powder will maintain its strength for about two years past its printed 'best by' date. Once opened, it will last for roughly six months. It doesn't freeze well, as freezing and defrosting could hamper the leavening requirements.
How do you tell if baking powder is bad?
You can check if baking powder is still good using a simple trick. Stir half a teaspoon of baking powder into a cup of hot water. If it bubbles heavily, the baking powder is still good; if not, it’s time to replace it.
Tips for storing baking powder to extend shelf life
• Keep baking powder in a dry, cool place. Humidity or heat can ruin its potency. A pantry or kitchen cabinet away from the stove is a good location.
• Always keep the container sealed tightly. This will prevent moisture or contaminants from getting inside.
• Don't use a wet spoon to measure baking powder, as moisture may instigate the leavening action, reducing the potency of the remaining powder.
• If you are not using baking powder regularly, consider buying it in small quantities to ensure its effectiveness when needed.