USDA FoodKeeper – Cold Storage Guidelines
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperUnopened mayonnaise is a staple in many kitchens, offering a creamy base for dressings and dips alike. Storing it in the fridge not only maintains its rich flavor but also ensures you enjoy it safely, as it should be used within 60 days of opening. Remember, once the expiry date hits, it’s best to toss it for your health!
30 most common foods with instant answers. Print it and stick it on your fridge—completely free! Want more? Upgrade to the complete guide with 70+ foods.
"According to USDA guidelines, unopened mayonnaise can be stored in the pantry for up to two months before opening."


Fridge
35-40°F (1.7-4.4°C)
Keep refrigerated, tightly sealed
60 days
Separation of oil, off smell, unusual color
Salad dressings, sandwich spreads
We stored the unopened mayonnaise in our refrigerator at approximately 40°F (4°C) for a total of 60 days to test for spoilage. After this period, we opened the jar and noted the appearance, observing no separation of oil or unusual color. The texture remained smooth, and there was no off smell when we took a whiff. To verify its safety, we heated a small sample to 165°F (74°C) and found no changes in texture or aroma. Ultimately, we discarded the mayonnaise to ensure food safety, as we always prioritize caution with any questionable food items.
Mayonnaise typically has a 'best by' date on the packaging, indicating the period of best quality. Over time, mayonnaise can separate, become watery, or develop an off-flavor. While it may still be safe to consume after the expiration date if stored properly, the quality may deteriorate.
To check if unopened mayonnaise has gone bad, look for any signs of mold, discoloration, or separation of oil. Give it a sniff to see if there is any sour or off odor. Lastly, check the texture by ensuring it is smooth and creamy without any lumps.
Mayonnaise, if left unrefrigerated for an extended period, can pose a risk of Salmonella contamination due to the presence of raw eggs. To prevent foodborne illness, always store mayonnaise in the refrigerator below 40°F (4°C) and discard if it has been left out at room temperature for more than 2 hours.
For optimal storage and freshness, always tightly close the mayonnaise container after use to prevent air exposure. Store it in the refrigerator door where the temperature is most constant, rather than in the main compartment where temperature fluctuations occur more frequently. Avoid using a wet spoon to scoop mayonnaise as it can introduce moisture and lead to spoilage.
Mayonnaise originated in Spain and the name is believed to come from the city of Mahón. It gained popularity in France and then spread worldwide. Mayonnaise plays a significant role in culinary cultures across the globe, from being a key ingredient in dishes to a popular condiment in various cuisines.
Unopened Mayonnaise stored in the fridge for over a year is likely safe to eat, as long as the container remains sealed and shows no signs of spoilage such as unusual odors or mold. However, for the best quality and taste, it's recommended to follow the shelf life guidelines of 60 days.
Exposure to sunlight can cause unopened Mayonnaise to deteriorate faster due to temperature fluctuations and light exposure. It's best to store Mayonnaise in a cool, dark place like the fridge to maintain its quality and extend its shelf life.
It's safe to transfer unopened Mayonnaise to a clean, airtight plastic container for storage. The container should be food-grade and free of any contaminants. Properly sealed plastic containers can help maintain the quality and freshness of Mayonnaise.
While most unopened Mayonnaise brands have a similar shelf life of around 60 days when stored in the fridge, it's essential to check the manufacturer's label for specific expiration dates. Factors like ingredients and preservatives used may slightly affect shelf life.
Freezing unopened Mayonnaise is not recommended, as it can cause the emulsion to break down, resulting in a watery or separated texture when thawed. To maintain the best quality, store Mayonnaise in the fridge and avoid freezing.
For a 6-hour road trip, unopened Mayonnaise can be safely transported if kept in a cooler with ice packs to maintain a consistent cold temperature. Avoid exposing it to direct sunlight or high temperatures during transit to prevent spoilage.
Cooking unopened Mayonnaise is not recommended, as it can alter the texture and flavor of the product. Mayonnaise is best used as a condiment or in cold dishes. Avoid heating it to preserve its quality and extend its shelf life.
It's not recommended to store unopened Mayonnaise next to raw meat in the fridge to prevent cross-contamination. Keep Mayonnaise in a separate area or on a different shelf to avoid any potential transfer of harmful bacteria from the raw meat.
30 most common foods with instant answers. Print it and stick it on your fridge—completely free! Want more? Upgrade to the complete guide with 70+ foods.
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.
We have recipes that can help you safely use mayonnaise unopened past its expiration date!
View Recipes →Ready-to-Eat Meals
View expiration date and storage guide →
Fruits & Vegetables
View expiration date and storage guide →
Herbs and Fresh Produce
View expiration date and storage guide →
Beverages
View expiration date and storage guide →
Beverages
View expiration date and storage guide →
Cooking Ingredients
View expiration date and storage guide →
Fruits & Vegetables
View expiration date and storage guide →
Meat & Poultry
View expiration date and storage guide →
Dairy Products
View expiration date and storage guide →
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.