Yogurt is a dairy product that can spoil within 24 hours if left out at room temperature. Keep uneaten yogurt refrigerated to avoid spoilage.
Store unopened yogurt in the refrigerator for seven to 10 days past its printed sell-by date. Do not store opened yogurt for more than five to seven days.
It is possible to freeze yogurt indefinitely, but it will lose its flavor and quality after one to two months. Always thaw out frozen yogurt in the refrigerator and never at room temperature.
If yogurt becomes runny, clumpy or produces a foul odor, consider it spoiled. Discard the product to avoid the risk of foodborne illness.