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How long do flour and baking basics last?

Flour and baking basics keep 1 year in the fridge once opened, 6 months in the freezer and 6–12 months in the pantry, according to USDA FoodKeeper.

Quick answer

Fridge1 yearonce opened
Freezer6 months 
Pantry6–12 monthsfrom purchase, opened: 6–8 months

Storage times by type

TypeFridgeFreezerPantry
Flour (white)
  • Opened: 1 year after opening
—
  • Unopened: 6–12 months from purchase
  • Opened: 6–8 months after opening
Cornmeal (regular, degerminated)
  • Opened: 1 year after opening
—
  • Unopened: 6–12 months from purchase
  • Opened: 2 years after opening
Yeast (packaged)
  • Opened: 4 months after opening
  • Unopened: 6 months
  • Unopened: 2 years from purchase
USDA tips: Pantry: Store in cool, dry place. Must be refrigerated or frozen once opened.
Baking powder——
  • Unopened: 6–18 months from purchase
  • Opened: 3–6 months after opening
Frosting or icing
  • Opened: 2–3 weeks after opening
—
  • Unopened: 10–12 months from purchase

Also covers: flour, all purpose flour, cornmeal, yeast, baking powder, frosting, icing.

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These are general guidelines from the USDA’s FoodKeeper data for food stored at safe temperatures: fridge at 40°F (4°C) or below, freezer at 0°F (−18°C). Freezer times are for best quality; food kept constantly frozen at 0°F stays safe longer. Always check the package and the food itself. When in doubt, throw it out. Shelf Shepherd isn’t affiliated with or endorsed by the USDA.

Source: USDA FSIS FoodKeeper data. Last reviewed November 5, 2026.

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