How long does baking powder last?

Checked 25 Oct 20265 official publishers, 5 sources

Unopened: 6-18 months in the pantry.

Storage times for baking powder by state and place
StatePantry
Unopened 6-18 months FoodKeeper Extension Extension
Opened 3-6 months FoodKeeper Extension Extension
Times assume continuous refrigeration at 40 °F or below. When in doubt, throw it out. Freezer times are for quality: “Because freezing 0° F (-18° C) keeps food safe indefinitely, the following recommended storage times are for quality only.” FDA

Signs it has gone bad

  • “especially when stored in packages which do not exclude air and light. Baking powder can lose its sizzle and baked products won't rise.” Extension
  • “mix 1 teaspoon of baking powder with ⅓ cup hot water. If it foams vigorously, it still has rising power.” Extension

Sources compared

SourceStatePantry
USDA FSIS (FoodKeeper) 2018Unopened6-18 months
Nebraska ExtensionUnopened6-18 months
NDSU ExtensionUnopened6-18 months
USDA FSIS (FoodKeeper) 2018Opened3-6 months
Nebraska ExtensionOpened3-6 months
NDSU ExtensionOpened3-6 months

A dash means that source gives no time for that place.

Handling and freezing notes

  • “Baking powder... Keep dry and covered.” Extension
  • “Leavening Ingredients: Baking Powder and Baking Soda Look for the expiration date on the container.” Extension
  • “Make sure measuring utensils are dry before dipping them into the container.” Extension

What the sources say

FoodKeeper and the Nebraska Extension chart agree on baking powder: 6 to 18 months in the pantry unopened and 3 to 6 months after opening.12

FoodKeeper counts the unopened time from the date of purchase, and neither source gives a fridge or freezer time.12

Utah State University Extension describes what happens as it ages: baking powder can lose its sizzle, so baked products will not rise.4

It lists this under chemical changes in storage, next to flavor and color changes that occur especially in packages that do not keep out air and light.4

The NDSU Extension food storage guide repeats the same 6 to 18 months unopened and 3 to 6 months opened, and advises keeping baking powder dry and covered.312

Penn State Extension suggests looking for the expiration date on the container and making sure measuring utensils are dry before dipping them in.5

Its freshness test is to mix 1 teaspoon of baking powder with ⅓ cup of hot water: if it foams vigorously, it still has rising power.5

Rules that apply here

Best-by and use-by dates
FlourSugar

Sources

  1. USDA FoodKeeper data v128, product 212: Baking powder. USDA FSIS (FoodKeeper). Dated 2018-09-06. Checked 2026-10-24. Baking powder. DOP_Pantry: 6-18 Months; Pantry_After_Opening: 3-6 Months
  2. Home Food Storage | UNL Food | Nebraska. Nebraska Extension. No date on the page. Checked 2026-10-24. Baking powder 6 to 18 months (unopened); 3 to 6 months (opened)
  3. 1 • FN579 • Food Storage GuideNDSU Extension. NDSU Extension. No date on the page. Checked 2026-10-25. Baking powder – unopened – opened 6 to 18 months 3 to 6 monthsBaking powder... Keep dry and covered.
  4. Food Storage in Home | USU. Utah State University Extension. No date on the page. Checked 2026-10-24. especially when stored in packages which do not exclude air and light. Baking powder can lose its sizzle and baked products won't rise.
  5. Storing Staple Ingredients in the Kitchen. Penn State Extension. No date on the page. Checked 2026-10-25. Leavening Ingredients: Baking Powder and Baking Soda Look for the expiration date on the container.Make sure measuring utensils are dry before dipping them into the container.mix 1 teaspoon of baking powder with ⅓ cup hot water. If it foams vigorously, it still has rising power.
  6. REFRIGERATOR & FREEZER STORAGE CHART. FDA. Dated 2018-03-01. Checked 2026-10-24. Because freezing 0° F (-18° C) keeps food safe indefinitely, the following recommended storage times are for quality only.