Most people scan their fridge door, spot something past its date, and shrug. Sometimes that instinct is fine. Sometimes expired condiments can land you in the emergency room.
The difference usually comes down to one thing: what the condiment is made from.
Egg-based and dairy-based condiments carry genuine food safety risks when they expire or are stored improperly. Acid-heavy, fermented, and high-salt condiments are far more forgiving. Knowing which is which is one of the most practical things you can do for your family’s health.
What Expiration Dates Actually Mean
The USDA is clear that most date labels are quality indicators, not safety cutoffs. A “best by” date tells you when something is at peak flavor and texture. A “sell by” date is a stocking guide for retailers. According to the USDA Food Safety and Inspection Service, only a “use by” date functions as an actual safety cutoff for most packaged foods.
That said, certain condiments operate by completely different rules. The more an item relies on eggs, dairy, or cream, the less forgiving it becomes once its date passes or once it has been opened. The FDA defines the bacterial danger zone as 40°F to 140°F, the temperature range where Salmonella, E. coli, and Listeria multiply fastest.
The Rule of Thumb
If it is made with eggs or dairy, follow the date closely. If it is built on acid, salt, or fermentation, you usually have more room. When in doubt, smell it, look at it, and use common sense.
The Condiments You Should Not Keep Past Expiration
High Risk
🥚 Mayonnaise
Mayo is the one condiment most likely to cause real problems when pushed past its date or stored improperly. Commercial mayo uses pasteurized eggs and preservatives, which help to a point. Once expired or left unrefrigerated, it can harbor Salmonella, E. coli, and Listeria. The USDA advises discarding mayo left above 50°F for more than eight hours.
Homemade mayo is an entirely different category. No preservatives, often unpasteurized eggs. Use it within four to seven days, full stop.
Opened in fridge
2 to 3 months
Homemade
4 to 7 days only
High Risk
🥗 Mayo-Based Condiments
Tartar sauce, garlic aioli, remoulade, and Thousand Island all follow the same risk profile as the mayo jar itself. If a dip or condiment tastes or smells different from when you first opened it, or if it has changed color or become watery, discard it regardless of the date on the label.
Opened in fridge
4 to 6 weeks
High Risk
🥛 Ranch Dressing
Ranch combines buttermilk, sour cream, and often mayo, bringing multiple perishable dairy components together in one bottle. It holds for about three months opened and refrigerated. Past its expiration date, texture and smell changes are your discard signals.
Opened in fridge
About 3 months
High Risk
🥗 Caesar Dressing
Caesar dressing often contains raw or lightly pasteurized egg yolks, which are a known potential source of Salmonella. Bottled commercial versions use pasteurized eggs and are safer, but the egg-oil base still becomes problematic past expiration. Do not rely on smell alone with this one.
Opened in fridge
1 to 2 months
High Risk
🧀 Blue Cheese & Creamy Dairy Dressings
Blue cheese dressing combines cheese crumbles, mayo, and sour cream, which are multiple dairy components that can each spoil independently. The powerful cheese smell can mask early signs of spoilage, which makes following the date more important than trusting your nose here.
Opened in fridge
1 to 2 months, then toss
Watch Closely
🫙 Sour Cream
Sour cream spoils faster than most people expect. The USDA recommends consuming it within one to three weeks after opening. A pool of liquid on the surface is normal separation, which is a sign to use it up soon rather than a sign it has gone bad. Once it smells beyond its normal tang, shows mold, or has been open past three weeks, discard it.
Opened in fridge
1 to 3 weeks (USDA)
Watch Closely
🌿 Prepared Horseradish
Horseradish is one of the most honest condiments in your fridge. It tells you immediately when it is past its prime because the sharp, pungent flavor starts fading as soon as you open the jar. By the time it hits its expiration date, most of the heat is already gone. The USDA FoodKeeper recommends using it within three to four months of opening.
Opened in fridge
3 to 4 months
Watch Closely
🍖 BBQ Sauce
Most commercial BBQ sauces contain enough sugar, vinegar, and preservatives to last about four months after opening. Artisan or natural sauces without preservatives have a shorter window. Discard if you see mold, notice a significant change in texture or smell, or if it has been open longer than four months.
Commercial (opened)
About 4 months
Natural/artisan
Check label
The 2-Hour Rule
Any perishable condiment left out at room temperature for more than two hours (or one hour above 90°F) should be discarded regardless of whether it was within its expiration date before being set out. This is a firm FDA guideline.
The Condiments With More Flexibility Than You Think
Several condiments have natural preservative properties that make them remarkably shelf-stable. These are much more forgiving than most people assume.
How to Tell If Any Condiment Has Gone Bad
Your senses provide the most reliable real-time feedback, regardless of what the label says. Discard any condiment that shows any of the following.
- 🍄
Any mold at all. Scooping around it is not safe. Mold sends invisible filaments below the visible surface. The whole jar goes. - 👃
An off smell. Sour, rancid, or simply different from the product’s normal aroma. Trust this signal even before the date passes. - 🎨
Significant color change. Darkening, graying, or yellowing in products that are normally bright and uniform. - 💧
Texture shifts. Separation in creamy products, unusual clumping, or excessive wateriness that was not there when the jar was new. - 🎈
Swollen or bulging packaging. This signals bacterial gas production inside the container.
✏️ One practical habit: Write the date you open any condiment on the lid with a permanent marker. It takes two seconds and removes all the guesswork.
Frequently Asked Questions
Is it safe to eat condiments past their best-by date?
It depends entirely on the condiment. Acid-heavy condiments like mustard, hot sauce, and vinegar-based dressings have significant flexibility. Egg-based and dairy-based condiments like mayo, ranch, and Caesar carry more risk and should be taken seriously. The USDA clarifies that “best by” dates are quality indicators, not safety cutoffs, but that does not apply equally across all products.
How long does opened mayonnaise last in the fridge?
Commercial mayonnaise stored at or below 40°F is generally safe for two to three months after opening. Homemade mayo should be used within four to seven days. The USDA FoodKeeper App, developed with Cornell University, is the most reliable reference for exact shelf life windows across hundreds of foods.
What happens if you eat expired mayo?
Properly refrigerated mayo that is slightly past its date may simply taste off. Mayo that has been left at room temperature, stored improperly, or is significantly past its date can harbor dangerous bacteria including Salmonella and E. coli. Symptoms typically begin within a few hours and can include nausea, vomiting, stomach cramps, and diarrhea.
Do condiments need to be refrigerated after opening?
Most do, but not all. Mayo, ranch, Caesar, tartar sauce, and other egg or dairy-based condiments must be refrigerated after opening. Mustard, hot sauce, soy sauce, and honey are more flexible, though refrigeration extends quality. See the Better Living Food Storage Guide for specifics on every common condiment.
What is the bacterial danger zone for food safety?
The FDA defines the danger zone as 40°F to 140°F, the temperature range where bacteria multiply most rapidly. Perishable foods including open condiments should never remain in this range for more than two hours.
The Bottom Line
The condiments that deserve the most respect are the ones built on eggs or dairy: mayo, ranch, Caesar, tartar sauce, and sour cream. Follow those dates. The condiments built on acid, salt, and fermentation, like mustard, hot sauce, soy sauce, and Worcestershire, give you considerably more room.
When anything looks, smells, or tastes different from how it started, trust that signal over the date on the label. And when it comes to mayo specifically, the cost of a new jar is always worth it.
Quick Reference
Toss when expired: Mayo, ranch, Caesar, blue cheese dressing, tartar sauce, aioli, sour cream.
More flexible: Mustard (1 yr), ketchup (6 mo), hot sauce (2 to 5 yrs), soy sauce (3 yrs), honey (indefinite), Worcestershire (1 to 3 yrs).
