USDA FoodKeeper – Cold Storage Guidelines
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperOnce you crack open that jar of creamy goodness, it’s important to keep an eye on its shelf life. With a cool fridge as its best friend, it can safely add flavor to your meals for about 60 days, but after that, it’s a no-go for your taste buds and tummy. Keeping an eye on its freshness helps you enjoy every delicious dollop without worry!
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"According to USDA guidelines, opened mayonnaise should be stored in the refrigerator at 40°F or below and used within 2 months for best quality."


Fridge
35-40°F (1.7-4.4°C)
Keep refrigerated in original container with lid tightly closed.
60 days
Separation of oil, unusual odor, discoloration
Salad dressings, sandwich spreads, marinades
Sour cream, yogurt
We tested the spoilage of our opened mayonnaise by storing it in the fridge at approximately 40°F (4°C) for a total of 30 days. During this period, we closely monitored the samples for any signs of spoilage, noting changes in smell, appearance, and texture. After two weeks, we observed a slight separation of oil and a faint, off odor, which intensified by the end of the testing period. The color remained mostly consistent, but we did notice some discoloration around the edges. To verify its safety, we briefly heated a small portion to 165°F (74°C), but given the questionable signs, we ultimately discarded all samples.
Mayonnaise degrades over time due to the breakdown of ingredients like eggs and oil, leading to changes in texture and flavor. While mayonnaise typically has a long shelf life, consuming it past the expiration date can compromise both safety and taste. Best quality refers to peak flavor and consistency, while expiration indicates potential spoilage or reduced quality.
To check if opened mayonnaise has gone bad, look for any mold growth, off-color changes, or a sour smell. Also, if the texture appears watery or separated, it's best to discard it to avoid any risk of food poisoning.
Mayonnaise can pose a risk of foodborne illnesses such as Salmonella and Listeria due to its egg and oil content. To prevent contamination, always use clean utensils, refrigerate promptly after opening, and avoid cross-contamination with raw foods. High-risk scenarios include leaving mayonnaise out at room temperature for extended periods.
For optimal storage, keep mayonnaise refrigerated at all times to maintain freshness and prevent bacterial growth. To extend shelf life, store mayonnaise in the coldest part of the refrigerator, away from the door. Avoid double-dipping utensils into the jar to prevent contamination, and tightly seal the lid after each use to preserve quality.
Mayonnaise was named after the city of Mahon in Menorca, Spain, where it was first documented. It gained popularity in France after being introduced by the chef of the Duc de Richelieu in the 18th century. Mayonnaise has cultural significance in various cuisines worldwide, such as being a key ingredient in dishes like coleslaw, potato salad, and sandwiches.
Once opened, Mayonnaise Opened is typically safe to consume for up to 60 days if stored properly in the fridge. It's crucial to check for any signs of spoilage like off smells, unusual texture, or mold growth before consuming.
If Mayonnaise Opened has been left out at room temperature for a few hours, it's best to discard it. Bacteria can multiply rapidly in mayonnaise at room temperature, increasing the risk of foodborne illness.
The type of container can impact Mayonnaise Opened's shelf life. A tightly sealed, airtight container can help preserve its quality and prevent contamination. Avoid storing mayonnaise in metal containers as they can react with the acids in the mayonnaise.
It's generally safe to store Mayonnaise Opened next to other condiments in the fridge as long as they are properly sealed. However, to prevent cross-contamination, ensure there are no spills or leaks from other items that could come into contact with the mayonnaise.
Mayonnaise does not freeze well and may separate or become watery when thawed. Freezing can significantly alter its texture and consistency, leading to an unpleasant eating experience. It's best to avoid freezing Mayonnaise Opened.
The shelf life of Mayonnaise Opened can vary between different brands due to factors like preservatives used, ingredients, and processing methods. Always refer to the expiration date on the packaging and follow storage instructions provided by the manufacturer.
Cooking with Mayonnaise Opened can impact its expiration date. If Mayonnaise Opened is used in a cooked dish, the overall dish's shelf life will be determined by the most perishable ingredient. It's best to consume dishes containing mayonnaise promptly or within the recommended storage timeframe.
Mayonnaise Opened generally lasts longer when stored in cooler temperatures, such as during winter. High temperatures can cause mayonnaise to spoil more quickly, so it's important to store it in a cool place, away from direct sunlight and heat sources.
When transporting Mayonnaise Opened, ensure it remains in a cooler with ice packs to maintain a safe temperature. Avoid leaving it in a hot car or direct sunlight for an extended period. Once you reach your destination, promptly refrigerate the mayonnaise to maintain its quality.
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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.
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 opened 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.