How Long Can You Keep Yogurt?
Most yogurt packages have a "sell by" date on the container. The "sell by" date is the last date that yogurt can be sold from grocery store shelves. The yogurt will be safe to eat longer than the date on the package. As long as the yogurt has been refrigerated at 40 F or below, it should be safe to eat for up to 10 days beyond the date.
Yogurt often will separate into a liquid and a solid, but you can stir it to mix it. If you notice any signs of mold or an unusual "clumpy" texture, then discard it. You can also freeze yogurt for about two months at 0 degrees, but the texture might change.
Julie Garden-Robinson, Food and Nutrition Specialist, NDSU Extension Service
Featured in Food Wise September 2016 Newsletter (PDF)