How long after purchase will a cake or cake mix remain good?

Cake mixes should be used within 6-9 months of purchase. Store-bought cake or a cake made from a mix should be consumed or frozen within 2-4 days of purchase.   For best quality, frozen cake should be defrosted and consumed within 2-3 months.
 
Source(s):
GourmetSleuth.com "Food Storage Guidelines”
 

 
 

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