I have been conducting a year long test for bread yeast after opening a bulk 1lb. package stored in a freezer is opened and then stored in the refrigerator in a snap top container for weekly use. The yeast block tested was stored in my freezer for two years before I opened it for this test.
I found that at 11 months old the refrigerated yeast worked as good as fresh yeast. In the 12th month, it began to be noticeably less active. It did make the dough rise OK but not normal like younger yeast. It produced good bread but the yeast was clearly at the end of its life.
Conclusion:
If you keep yeast frozen for two years and then open it, you have about one year if refrigerated before the yeast becomes questionable for use. My test used 2 years stored frozen yeast. I don’t know how long frozen yeast will be good for because I only tested two-year frozen yeast. However, I suspect frozen yeast will be good for many more years.
Mike, I saw your post and it made me curious. I did some looking around at some commercial web sites that are associated with yeast, and the answers I got were all over the scale. Anything from a max of 6 months once opened, to several years. My own personal experience pretty well dovetails with your.
ReplyDeleteThanks for the comment Harry. Like you said, answers are all over the scale. The internet is great for some things but agreeable facts are not one of them. That's why I take the time to actually test for reliable results.
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I have not done tests to compare how well it works, but I have yeast in my freezer that is 10 years old and still rises and works for making bread. It may not be 100% of what it was when I bought it, but it will work to make bread, and for me, that is the important part.
ReplyDeleteOh wow! My experience is my yeast is not good after one year. I like my bread to rise more than it does with old yeast.
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