How can you tell if Greek Yogurt has gone bad?

Signs that Greek Yogurt has gone bad: Pink, orange, or green mold, fizzy bubbles, sharp ammonia smell. Still good if: Watery whey on top — stir it back in. This is normal protein-water separation, not spoilage.

What does the date label on Greek Yogurt mean?

Greek Yogurt usually carries a "Use By" date. The last date the manufacturer recommends for peak quality — for most foods this is still quality-based, not a safety cutoff (infant formula is the one exception). See our date-labels guide for the full breakdown.

Dairy

How long does Greek Yogurt last?

Q: How long does Greek Yogurt last?

In the fridge: 1–2 weeks. In the freezer: 1–2 months. Sealed / unopened: Check date. Stir well before using. If liquid separates, stir back in — that's whey, not spoilage.

High confidence Safety concern

How long does Greek Yogurt last? fridge 1–2 weeks, freezer 1–2 months. Plus spoilage signs, sources, and an unopened-vs-opened note.

Fridge

1–2 weeks

Pantry

Refrigerate only

Freezer

1–2 months

Sealed / unopened: Check date

Signs Greek Yogurt has gone bad

Pink, orange, or green mold, fizzy bubbles, sharp ammonia smell.

Still good if

Watery whey on top — stir it back in. This is normal protein-water separation, not spoilage.

Discard immediately if

Any visible mold of any color
Container is bloated or hisses when opened
Greasy or oily film on top

Why guidance varies

Dairy spoilage depends on initial pasteurization, fridge temperature, and how often the container is opened; manufacturer-printed dates assume continuous storage at 40°F (4°C) or below.

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Sources for this answer

A USDA FoodKeeper — Storage windows and refrigeration guidance for this category.
A USDA FSIS — Food Product Dating — Date-label interpretation and food-safety baseline.

Reviewed: 2026-05 · Rule: if manufacturer storage instructions are stricter than category guidance, the manufacturer instructions win.