Expiration & Storage Tips
When does active dry yeast expire?
Unopened, active dry yeast should last until the date printed on its package, typically around 2 years from production. Once opened, it'll maintain its leavening power for about 4-6 months if stored properly, even after the package 'best-by' date. Although you can freeze active dry yeast to extend its shelf life up to a year, frequent defrosting can kill the yeast cells, so only freeze as per your requirement.
How do you tell if active dry yeast is bad?
To check if active dry yeast is still good, you can do a 'proofing' test; dissolve a teaspoon of sugar in a half cup of warm (110-115°F, 43-46℃) water, add a packet (2 1/4 teaspoons) of yeast, and wait 10 minutes. If the mixture bubbles and develops a yeasty aroma, the yeast is still active. If not, it's time to replace it. Also, if you notice the colour becoming darker or it develops a stronger smell, these are signs it has gone bad.
Tips for storing active dry yeast to extend shelf life
• Keep the yeast in a cool, dry place such as a pantry
• After opening, storing it in an airtight container in the refrigerator can extend its life
• If you live in a hot climate, keep the yeast in the refrigerator, even if unopened
• If you choose to freeze it, avoid frequent defrosting. When you need some, measure out the required amount and let it reach room temperature before using it to make sure it's still active, then return the rest to the freezer quickly