For the shelf stable polenta and grits: After you open the Polenta it will last 5-7 days in the fridge. Do not freeze the polenta. Refrigeration is ok, but we recommend just storing unopened chubs of polenta in your pantry.

How can you tell if polenta has gone bad?

If it smells rancid or sour, it's past its prime, and you should discard it. Another thing to remember is that black and grey specs in whole-grain cornmeal are normal. Those flecks can be attributed to the germ of the corn. Other than that, you should use the guidelines for degerminated corn.

How long is unopened polenta good for?

Keep unopened instant polenta in a cool, dry area for approximately two months. Store leftover instant polenta in a resealable airtight container in the fridge for around two days.