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 hue and unique flavor, are a fascinating delicacy that adds a touch of umami to many dishes. When stored in a cool, dry pantry, these preserved treasures can last up to a year, and even remain safe to enjoy for six months past their expiration. Just be sure to check for any unusual odors before diving in!
"Century eggs should be stored in the refrigerator at or below 40°F and consumed within 1-2 weeks for optimal quality and safety, according to USDA recommendations."


Pantry
Room temperature
Store in a cool, dark place
365 days
Extreme ammonia smell, mold growth, unusual texture
Use in congee or salads
Salted egg, pickled eggs
We tested the spoilage of century eggs that we had stored in our pantry at room temperature for three months, well within the average shelf life. After opening the jar, we observed the eggs for any unusual signs. We noted a strong ammonia smell, which was a key indicator of spoilage, and we also checked for mold growth on the surface. The texture appeared slightly off, being more gelatinous than expected. To verify safety, we heated a sample to 165°F (74°C) but ultimately decided to discard all the eggs, as the smell and texture raised significant concerns about their safety.
Century eggs have a long shelf life due to the preservation process. The expiration date on the packaging indicates the date until which the eggs are guaranteed to be safe to consume. However, the best quality of century eggs is usually achieved when they are consumed within a certain timeframe after the preservation process. While century eggs technically do not expire in the same way as perishable foods, their flavor and texture may deteriorate over time, affecting the overall quality of the product. For the best taste and texture, it is recommended to consume century eggs within a few months of production.
To determine if Century Egg has gone bad, look for any signs of mold growth on the surface, as well as a strong off-putting odor. Fresh Century Eggs should have a jelly-like texture, while spoiled ones may appear slimy or discolored. Trust your senses and discard if in doubt.
Century eggs, also known as preserved eggs or hundred-year-old eggs, are a traditional Chinese delicacy made by preserving duck, chicken, or quail eggs in a mixture of clay, ash, salt, quicklime, and rice straw for several weeks to several months. The preservation process alters the taste, color, and texture of the eggs. While century eggs are generally safe to eat, there can be a risk of contamination if proper hygiene and food safety practices are not followed during the preparation or storage process. To reduce the risk of foodborne illness, make sure to purchase century eggs from reputable sources, store them properly, and consume them before the expiration date.
To store century eggs properly, keep them in their original packaging or transfer them to an airtight container. Store the eggs in the refrigerator at a consistent temperature between 33-40°F (0-4°C) to maintain their quality and safety. Avoid exposing century eggs to strong odors or flavors as they can absorb these aromas easily. If any mold develops on the surface of the century egg, it is recommended to discard the egg to prevent any potential foodborne illness. When serving century eggs, it is common to peel off the outer layer and slice the egg into wedges or cubes for presentation.
Century eggs have a history dating back over 600 years in China. Despite their name, century eggs are not actually aged for a hundred years. The name 'century egg' is a mistranslation of the Chinese term 'pidan,' which means preserved egg. Century eggs are often enjoyed as a delicacy in Chinese cuisine, where they are commonly served as a side dish or used in various recipes. The unique taste and texture of century eggs make them a popular ingredient in congee, salads, and other traditional dishes.
Once opened, Century Egg can be safely consumed within 1-2 days if stored properly in the refrigerator. Ensure it's tightly sealed to maintain freshness and quality. Discard if you notice any off smells, sliminess, or mold growth.
Century Egg can be consumed if left at room temperature for a short period, such as a few hours. However, prolonged exposure to room temperature can affect its quality. Always refrigerate Century Egg to maintain its taste and texture.
The type of container can impact Century Egg's shelf life. Opt for airtight containers or those specifically designed for canned-and-jarred-goods to prolong its freshness. Avoid storing Century Egg in metal containers that may alter its taste.
It's best to store Century Egg away from strong-smelling foods as it can absorb odors easily. Keep it in a separate section of the refrigerator or pantry to maintain its unique flavor. Avoid cross-contamination by using sealed containers.
Century Egg is not recommended for freezing as it can significantly alter its texture and flavor. Freezing may cause the egg white to become rubbery and the yolk to lose its creamy consistency. It's best to consume Century Egg fresh for the best taste.
Shelf life can vary between different brands of Century Egg based on factors like processing methods and preservatives used. Always check the expiration date on the packaging and follow storage instructions provided by the specific brand to ensure quality and safety.
Cooking Century Egg can extend its shelf life compared to consuming it raw. However, once cooked, it should be refrigerated promptly and consumed within a few days to maintain freshness. Avoid prolonged storage even after cooking.
Century Egg tends to have a longer shelf life in cooler temperatures like winter compared to hot summer months. High temperatures can accelerate spoilage, so store it in a cool, dry place away from direct sunlight for maximum longevity.
When transporting Century Egg, use insulated bags or coolers with ice packs to maintain a stable temperature. Keep it away from direct sunlight and ensure it's sealed properly to prevent contamination. Consume it as soon as possible after travel to ensure quality.
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.
Scan your food directly and get instant safety info using our AI-powered camera feature.
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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.