Is it OK to use expired yeast?

With the thought that dry yeast is basically freeze-dried and should have a decent shelf life, I proofed one envelope in warm water with some sugar to see if it really "expires". It foamed right up, so it seems like the answer is, at least for one year after the marked date, no.

Regarding this, how long can you keep yeast?

Yeast Expiration Date

Dry Active Yeast lasts for2-4 Months4 Months
Cake Yeast lasts for1-2 Weeks2-3 Months
Once Opened - regardless of dateRefrigeratorFreezer
Dry Active Yeast lasts for4-6 Months6 Months

How do I know when yeast is activated?

Active dry yeast needs to be activated before use. To do this, mix together lukewarm water, sugar and yeast, stirring vigorously to ensure the yeast is fully dissolved. Cover, and set aside in a warm place for 5 to 10 minutes. Once froth forms on top, your yeast is activated and ready to use.

How do you know when yeast has proofed?

To make sure active dry yeast (not quick-rise yeast) is alive and active, you may first want to proof it. Here's how: Dissolve one package of yeast and 1 teaspoon sugar in 1/4 cup warm water (110° to 115°). Let stand for 5 to 10 minutes.

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