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Because yeast is actually made up of living microorganisms. Keeping the yeast refrigerated keeps the yeast inactive, which means that it will still be fresh and able to make your bread rise when you take it out. If you keep the yeast at room temperature, it will die off more quickly and not last nearly as long.

(Even in the freezer, yeast doesn't last forever, though.)

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11y ago
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Q: Why does the traditional yeast you buy in the store for making bread say to refrigerate after opening?
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