How Long Does Mustard (Opened) Last?
Opened yellow, Dijon, or whole grain mustard.
The Short Answer
Mustard (Opened) lasts 365–365 days in the refrigerator when stored properly at 40°F or below. At room temperature in the pantry, expect 30–60 days under normal conditions. These times are based on USDA food safety guidelines and assume proper storage conditions.
Storage Times at a Glance
Source: USDA FoodKeeper | Last verified: March 19, 2026 | Our methodology
Mustard lasts about a year in the fridge after opening. It does not spoil in a dangerous way; it just loses flavor over time. If it smells like mustard and tastes like mustard, it is fine.
How to Store Mustard (Opened)
Refrigerate after opening. Mustard is one of the longest-lasting condiments due to its vinegar and turmeric content.
How to Tell if Mustard (Opened) Has Gone Bad
Look for these signs that mustard (opened) has spoiled: dried out texture, darkened color, bitter taste, separation.
The Professor's rule: When in doubt, throw it out. No meal is worth food poisoning.
The Bottom Line
Properly stored mustard (opened) stays safe for 365–365 days in the fridge. Always store in airtight containers, refrigerate within 2 hours of purchase or preparation, and trust your senses. If something looks, smells, or feels off, discard it regardless of how many days it has been.
Frequently Asked Questions
Mustard rarely becomes unsafe, but it does lose potency. Old mustard tastes flat and bland. If it has been open for more than a year, replace it.