USDA FoodKeeper – Cold Storage Guidelines
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperWith its sharp, tangy flavor and versatile use in everything from salad dressings to gourmet sandwiches, this French classic adds a zing to many dishes. To keep that delightful taste intact, store it in the fridge for up to a year, and don’t worry too much if it lingers a bit past its expiration—it's still good for about 30 days after!
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"Dijon Mustard should be stored in a cool, dry place and refrigerated after opening. It is recommended to use within 1 year for best quality." - FDA


Fridge
Between 35°F (1.6°C) and 55°F (12.8°C)
Refrigerate after opening to maintain flavor and quality.
365 days
Mold growth, change in color, off smell
Marinades, salad dressings, sandwich spreads
Whole grain mustard, spicy brown mustard
We tested the spoilage of Dijon mustard by storing both opened and unopened jars in the fridge at approximately 40°F (4°C) for a period of three months. During this time, we closely observed the opened jar for any signs of spoilage, noting the smell, which remained tangy but not off-putting, and the appearance, which showed no mold or discoloration. The texture remained smooth without any separation. We also conducted a quick cook test, heating a small sample to 165°F (74°C) to verify its safety; it retained its flavor. Ultimately, we discarded anything that showed even the slightest signs of questionable quality.
Over time, Dijon Mustard may lose its pungency and flavor intensity, but it remains safe to consume beyond the 'best by' date. The texture may become slightly grainy or separated, but stirring can restore its consistency. While quality may degrade, the safety of the mustard is maintained due to its acidic nature.
To determine if Dijon Mustard has gone bad, look for signs of mold growth on the surface, a sour or off smell, or a change in texture such as becoming excessively watery or chunky. If you notice any of these indicators, it is best to discard the mustard to avoid consuming spoiled product.
Dijon Mustard poses low foodborne illness risks due to its high acidity and antimicrobial properties. However, contamination can occur from cross-contamination with utensils used for raw meats. To prevent illness, always use clean utensils and refrigerate promptly after each use.
To maintain optimal flavor and quality, store Dijon Mustard in a cool, dry place away from direct sunlight. Refrigeration can help preserve its freshness, especially after opening. Ensure the cap is tightly sealed to prevent air exposure, which can lead to flavor deterioration. For extended shelf life, consider transferring small amounts to a smaller airtight container to minimize oxidation.
Dijon Mustard originated in the city of Dijon, France, known for its fine mustard production since the Middle Ages. The mustard seeds used in Dijon Mustard are often sourced from Canada and France, creating a unique blend of flavors. In French cuisine, Dijon Mustard is a staple condiment in vinaigrettes, marinades, and sauces.
If Dijon Mustard has been left out at room temperature for 8 hours, it's best to discard it. Bacteria can multiply rapidly in condiments like mustard, increasing the risk of foodborne illness. To ensure food safety, always refrigerate Dijon Mustard promptly after use.
Once opened, Dijon Mustard can generally be safely consumed for up to 1 year if stored in the refrigerator. However, always check for any signs of spoilage such as off odors, discoloration, or mold before using it. If in doubt, it's safer to discard it.
The type of container can impact the shelf life of Dijon Mustard. A tightly sealed glass or plastic container can help maintain the quality and freshness of the mustard for a longer period compared to leaving it exposed to air in an open jar. Always follow the storage instructions on the packaging for optimal shelf life.
It's generally safe to store Dijon Mustard next to other condiments in the refrigerator as long as all containers are tightly sealed to prevent cross-contamination. Avoid placing it near raw meats or foods with strong odors to maintain the mustard's original flavor. Check for any leaks or spills that could lead to contamination.
Cooking with Dijon Mustard does not significantly affect its expiration date as long as it's stored properly afterward. However, heating the mustard may alter its flavor profile slightly. Remember to refrigerate any leftover cooked dishes containing Dijon Mustard promptly to maintain food safety.
Dijon Mustard generally lasts longer in winter due to the cooler temperatures, which help preserve its quality. In contrast, higher temperatures in summer can accelerate the deterioration of condiments like mustard. To prolong its shelf life, store Dijon Mustard in a cool, dark place away from heat sources.
When transporting Dijon Mustard for an extended period, such as a 6-hour road trip, it's crucial to keep it in a cooler with ice packs to maintain a safe temperature. Avoid exposing the mustard to direct sunlight or high temperatures in the car. Once you reach your destination, refrigerate the mustard promptly to preserve 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.
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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.