You opened a tub of yogurt a week and a half ago and it still smells fine. Or you found a container in the back of the fridge that is three weeks past the date. Does yogurt go bad?
The short answer: Yes, yogurt goes bad, but the date on the container is not the whole story. According to the USDA FoodKeeper app, yogurt should be consumed within 1 to 2 weeks of purchase. Unopened yogurt can often be safe 1 to 3 weeks past the printed date if it has been continuously refrigerated. Once opened, use it within 5 to 7 days. The type of yogurt matters significantly: Greek lasts a little longer than regular, flavored yogurt spoils faster than plain, and plant-based yogurt has its own different spoilage cues.
For a full overview of how dairy and perishable foods compare on shelf life, visit our Complete Food Storage Guide.
Key Takeaways
Unopened yogurt: safe 1 to 3 weeks past the printed date if properly refrigerated. Always check for spoilage signs.
Opened yogurt: use within 5 to 7 days per USDA guidance.
Greek yogurt lasts slightly longer than regular due to lower moisture and higher acidity (pH 4.0 to 4.6).
Flavored yogurt spoils faster than plain. Added sugars and fruit shorten the window.
The liquid on top is whey. Completely normal, not spoilage. Stir it back in or pour it off.
A bloated container before opening is a spoilage sign. Discard immediately.
The 2-hour rule applies: yogurt left at room temperature for more than 2 hours should be discarded.
Frozen yogurt: 1 to 2 months per USDA. Texture becomes watery on thawing; best for smoothies and baking.
How Long Does Yogurt Last?
Yogurt shelf life depends on the type, whether it has been opened, and how carefully it has been stored. The USDA FoodKeeper app sets the standard: 1 to 2 weeks from purchase, refrigerated. In practice, unopened yogurt stored properly often remains good beyond that window.
Type
Unopened (Past Printed Date)
Opened (Refrigerated)
Frozen
Regular plain yogurt
1 to 2 weeks
5 to 7 days
1 to 2 months
Greek yogurt (plain)
2 to 3 weeks
5 to 7 days
1 to 2 months
Flavored yogurt (fruit, sweetened)
1 to 2 weeks
5 to 7 days
1 to 2 months
Plant-based yogurt (almond, coconut, oat)
1 to 2 weeks
5 to 7 days; check label
1 to 2 months
Homemade yogurt
Not applicable
1 week to 10 days; no preservatives
1 to 2 months
Opened yogurt shelf life per USDA FoodKeeper. Unopened estimates based on USDA guidance and US Dairy industry guidance. Always check for spoilage signs regardless of date.
Why Greek Yogurt Lasts Longer Than Regular
The Science Behind Greek’s Longer Shelf Life
Greek yogurt is made by straining regular yogurt through a fine mesh or cheesecloth to remove much of the liquid whey. This straining process removes moisture and concentrates everything else including lactic acid, proteins, and fat. The result is a thicker product with a pH between 4.0 and 4.6, according to US Dairy.
That lower pH (more acidic) creates a less hospitable environment for spoilage bacte
