Yeast and BakingLessons


Yeast Freshness Test


Follow these steps if you are unsure of the freshness of your yeast (or just want to give it a ‘good start’).

To ‘proof’ or test dry yeast, use the steps here:  (if proofing fresh cake yeast scroll down.)

  • Using a one-cup liquid measuring cup, dissolve 1 teaspoon of granulated sugar in 1/2 cup warm tap water at 110°F-115°F.
    • Using a thermometer is the most accurate way to determine the correct liquid temperature. Any thermometer will work as long as it measures temperatures between 75°F and 130°F.
    • If you don’t have a thermometer, the tap water should be warm but NOT hot to the touch.
  • Stir in one 1/4 oz. packet (7g) or 2 1/4 tsp of dry yeast until there are no more dry yeast granules on top. Yeast should be at room temperature before using.
  • In three to four minutes, the yeast will have absorbed enough liquid to activate and start to rise.
  • After ten minutes, the foamy yeast mixture should have risen to the 1-cup mark and have a rounded top. It should look like the picture below.

Yeast Freshness Test

  • If this is true, your yeast is very active and should be used in your recipe immediately.
  • Remember to deduct 1/2 cup liquid from the recipe to adjust for the water used in this test.
  • If the yeast did not rise to the 1-cup mark, your yeast has little or no activity. Discard this yeast.


To ‘proof’ fresh cake yeast:

  • Dissolve 1 tsp sugar in 1/2 cup of lukewarm liquid, 90°F – 95°F.
  • Crumble cake yeast into sugar solution and stir until dissolved.
  • Let mixture stand until yeast begins to foam vigorously (5 – 10 minutes).