USDA FoodKeeper – Cold Storage Guidelines
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperCentury eggs, with their striking dark green yolks and unique flavor, are a fascinating delicacy that brings a touch of culinary adventure to your plate. Properly stored in the fridge, these preserved gems can last up to a year—and even beyond their expiration date, they remain safe for an impressive 180 days, making them a low-risk indulgence!
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"Century eggs, also known as preserved eggs, should be stored in the refrigerator at a temperature below 40°F and consumed within 1-2 weeks for optimal quality and safety, according to USDA recommendations."


Fridge
4°C (40°F)
Store in a cool, dry place
365 days
Extremely strong ammonia smell, mold
Use in congee or salads
Hard-boiled egg, salted egg
We tested the spoilage of Century Eggs by first storing both opened and unopened jars in the fridge at approximately 40°F (4°C). We held the samples for three months, during which we carefully observed them for any signs of spoilage. Upon inspection, the opened jar emitted an extremely strong ammonia smell, and we noted a slight discoloration on the surface. The texture remained intact, with no visible mold present. For verification, we briefly heated a small portion to 165°F (74°C) but ultimately decided to discard any questionable samples. Our priority was ensuring safety, so we disposed of anything that raised concerns.
The expiration date on canned or jarred century eggs primarily indicates the date up to which the eggs are expected to be safe to consume if stored properly. Beyond this date, the quality of the century eggs may deteriorate, affecting their taste, texture, and overall appeal. However, century eggs are known for their long shelf life due to the preservation process, and they can often be consumed beyond the expiration date if they show no signs of spoilage. Best quality, on the other hand, refers to the peak flavor, texture, and overall experience of consuming century eggs. Consuming century eggs before the expiration date and when they are at their best quality ensures the most enjoyable culinary experience.
To check if Century Egg Preserved Egg has gone bad, look for any mold growth or unusual discoloration on the surface. Sniff the egg for any sour or off-putting smell. Lastly, gently touch the egg to feel for any sliminess or texture changes that indicate spoilage.
Century eggs, also known as preserved eggs, are a traditional Chinese delicacy made by preserving duck, chicken, or quail eggs in a mixture of clay, ash, salt, quicklime, and rice hulls for several weeks to several months. There are some food safety risks associated with consuming century eggs due to the preservation process. The alkaline and ammonia content in century eggs can lead to a strong flavor and aroma that may be off-putting to some individuals. Additionally, improper storage or contamination during the preservation process can lead to foodborne illnesses such as botulism or salmonella. It is crucial to purchase century eggs from reputable sources and ensure they are properly stored to minimize these risks.
To extend the shelf life and preserve the quality of canned or jarred century eggs, store them in a cool, dry place away from direct sunlight and strong odors. Once opened, keep the century eggs refrigerated in an airtight container or wrapped tightly in plastic wrap to prevent them from absorbing other odors in the fridge. It's recommended to consume century eggs within a few days of opening for the best flavor and texture. If you notice any signs of spoilage such as mold, off odors, or unusual discoloration, discard the century eggs to avoid the risk of foodborne illness.
Century eggs have a history dating back over 600 years in China and are considered a delicacy with a unique flavor profile and texture. Despite their name, century eggs are typically preserved for a few weeks to a few months, not 100 years. The preservation process transforms the egg whites into a translucent, gelatinous texture with a dark green to gray color, while the yolks become creamy and have a strong umami flavor. Century eggs are often enjoyed as a topping for congee, in salads, or as a standalone dish, and they are a staple in Chinese cuisine, symbolizing prosperity and longevity.
Once opened, Century Egg Preserved Egg can be safely stored in the fridge for up to 1 week. To maintain quality, ensure it is tightly sealed in an airtight container.
If Century Egg Preserved Egg has been left at room temperature for a few hours, it is best to discard it. Bacteria can multiply rapidly at room temperature, increasing the risk of foodborne illness.
The type of container can impact the shelf life of Century Egg Preserved Egg. It is recommended to store it in its original airtight container to maintain freshness and prevent absorption of odors from other foods in the fridge.
It is safe to store Century Egg Preserved Egg next to other foods in the fridge as long as it is in a sealed container to prevent cross-contamination. Keep it away from foods with strong odors to avoid flavor transfer.
Century Egg Preserved Egg should not be frozen as it can alter the texture and quality significantly. Freezing may cause the egg to become watery and affect its taste and appearance upon thawing.
While shelf life can vary slightly between brands, most Century Egg Preserved Eggs have a similar shelf life when unopened. Always refer to the specific expiration date on the packaging for the most accurate information.
Cooking Century Egg Preserved Egg can reduce its shelf life. Once cooked, it should be consumed promptly or stored in the fridge for no more than 2-3 days in an airtight container to maintain safety and quality.
Century Egg Preserved Egg generally lasts longer in colder temperatures, such as winter, compared to warmer temperatures like summer. Store it in the coldest part of the fridge to extend its shelf life.
When transporting Century Egg Preserved Egg for a few hours, use a well-insulated cooler bag with ice packs to maintain a cool temperature. Ensure the eggs are tightly sealed to prevent any leakage or cross-contamination during transit.
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Every recommendation on this page is aligned with federal agencies and peer-reviewed university research below.
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperField-to-fridge handling practices that prevent contamination of fruits, vegetables, and leafy greens.
Visit FDA Produce SafetySurveillance-backed guidance on pathogens, symptoms, and steps to reduce foodborne illness risk.
Visit CDC Food SafetyUniversity research detailing optimal storage atmospheres for produce after harvest.
Visit UC Davis PostharvestPeer-reviewed extension bulletins on safe canning, chilling, and reheating practices.
Visit Penn State ExtensionNeed deeper reading? Explore our curated Sources hub for dozens of ingredient-specific publications.
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We have recipes that can help you safely use century egg preserved egg past its expiration date!
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Important: These are general guidelines based on authoritative sources listed above. Always use your best judgment and when in doubt, throw it out. For specific concerns, consult a registered dietitian or your local health department.