Yogurt can be safe to eat after its expiration date in some cases, but there are important caveats to consider. Key points

• Unopened yogurt: Generally can be safe for a period after the printed date if it has been refrigerated properly, though quality (taste and texture) may decline. The safest approach is to verify that there are no off smells, visible mold, or unusual texture. If it looks and smells normal, it’s often still edible, but this is not guaranteed and depends on storage conditions and the exact product. [citation-based guidance from consumer safety sources]
• Opened yogurt: More risky. Once the container has been opened, the chance of contamination increases, and many experts advise discarding it within about a week after opening, regardless of the stamped date, especially if it shows any signs of spoilage such as sour or off smells, mold, or a change in texture. Fruits on the bottom or added mix-ins can spoil more quickly and should be treated with extra caution. [general safety guidance from food-safety authorities and expert commentary]
• Best-by/best-if-used-by dates: These dates are about quality, not safety. Yogurt can taste tangier and have a different texture after the date, but still be safe to eat if it’s been stored properly and shows no spoilage. The key is to assess smell, appearance, and taste cautiously. [quality guidance from food-safety resources]

What to check before deciding

• Smell: If it has a sour, rotten, or unusually strong off-putting odor, discard it.
• Appearance: Any visible mold or shading changes means discard.
• Texture: Excessive separation, curdling, or slime can indicate spoilage.
• Taste: If it tastes off or unusually sour beyond its typical tang, spit it out and discard.

Practical tips

• Keep yogurt consistently refrigerated at or below 40°F (4°C).
• Don’t taste or consume yogurt if there are any signs of spoilage or if it has been left out at room temperature for more than 2 hours (or 1 hour in hot conditions).
• When in doubt, err on the side of safety and discard.

If you want, share details about the specific product (unopened vs opened, any visible signs of spoilage, how long it’s been past the date, storage conditions), and can give a more tailored assessment.