How Long Does Yogurt Last After the Expiration Date?

Quick Answer

Yogurt usually stays good for 1 to 3 weeks after the date on the container if it has been continuously refrigerated and remains unopened. Once opened, plan to finish it within about a week. The printed date is generally a "sell-by" or "best-by" date indicating peak quality, not the moment it becomes unsafe. Because yogurt is a fermented, acidic food, it resists spoilage longer than fresh milk.

Shelf Life Past the Printed Date

Storage Situation	How Long Past Date	Notes
Unopened, refrigerated	1–3 weeks	Peak quality declines gradually
Opened, refrigerated	About 1 week	Reseal tightly
Greek yogurt (unopened)	1–2 weeks	Similar to regular
Frozen yogurt (homemade freeze)	1–2 months	Texture changes on thaw
Left out over 2 hours	Discard	Bacteria multiply at room temp

Why Yogurt Lasts Beyond Its Date

Yogurt is made by fermenting milk with live bacterial cultures, which produce lactic acid. That acidity creates an environment where harmful spoilage bacteria struggle to grow, so yogurt naturally keeps longer than the milk it's made from. The live cultures also help preserve it. This is why an unopened cup can remain perfectly good a couple of weeks past the label date.

Understanding Date Labels

With the exception of some infant formula, food date labels in the U.S. are not federally required safety dates — they're manufacturer estimates of quality. Common labels include:

• "Sell-By": Tells the store how long to display it; you can eat it after.
• "Best If Used By": Indicates peak flavor and texture, not safety.
• "Use-By": The last date for best quality (still a quality date for yogurt).

Factors That Affect How Long Yogurt Lasts

Whether It's Been Opened

Sealed yogurt is protected from airborne contaminants. Once opened, bacteria and mold can be introduced, shortening the window to about a week.

Refrigerator Temperature

Yogurt should be stored at or below 40°F (4°C). A warm fridge or repeated temperature swings (from the fridge door) speeds spoilage.

Add-Ins

Yogurt with fresh fruit mixed in spoils faster than plain yogurt. Fruit on the bottom, sealed, holds up better.

Cross-Contamination

Eating directly from the container or using a used spoon introduces bacteria that shorten shelf life. Scoop with a clean utensil into a bowl instead.

Signs Yogurt Has Gone Bad

A little clear or yellowish liquid on top (whey) is normal — just stir it in. Throw yogurt out if you see:

• Mold (fuzzy spots of any color)
• A puffed, bloated, or bulging lid
• A sour, rancid, or "off" smell beyond normal tang
• A curdled, lumpy, or slimy texture (in previously smooth yogurt)
• Any strange taste

When to See a Doctor

Eating spoiled yogurt can cause nausea, vomiting, diarrhea, or stomach cramps. Most cases resolve on their own with rest and fluids. Seek medical care if you have a high fever (over 101.5°F), signs of dehydration, bloody stool, or symptoms lasting more than a few days. People who are pregnant, elderly, very young, or immunocompromised should be more cautious with dairy past its date.

Bottom Line

An unopened cup of yogurt is usually fine for 1–3 weeks past its printed date if it's been kept cold, and about a week once opened. Trust your senses — if it smells, looks, or tastes off, or shows mold, throw it out.