Tama, for longest shelf life we recommend storing your yeast in the freezer. This will generally extend the shelf life well beyond the "use by" date. Refrigerated yeast has a shorter shelf life. Red Star recommends using it within 4 months once it's opened and stored in the refrigerator, and 6 months when stored in the freezer, but we've found it lasts longer than that in the freezer. Be sure to keep it in an airtight container or ziploc bag. Barb@KAF

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