Cooked oatmeal keeps for 3 to 4 days in the fridge, in a covered container. That’s the USDA’s general guideline for leftovers. Overnight oats follow the same rule. Dry, uncooked oats don’t need the fridge at all: keep them in an airtight container in the pantry.
How to store cooked oatmeal
- Cool it and refrigerate it within 2 hours of cooking.
- Use an airtight container, or individual jars for grab-and-go breakfasts.
- Add fresh fruit, nuts and yogurt when you eat it, not before storing. They go soggy or spoil faster.
How to reheat it
Oatmeal thickens a lot in the fridge.
- Microwave: add a splash of milk or water, stir, and heat for 1 to 2 minutes, stirring halfway, until hot.
- Stove: warm it over low heat with a splash of liquid, stirring until smooth.
Can you freeze oatmeal?
Yes. Freeze cooked oatmeal in portions (muffin tins work well) for up to about 3 months. Reheat it from frozen in the microwave with a splash of milk.
Signs it’s gone bad
A sour smell, mold, a slimy texture or any off colour. When in doubt, throw it out.
Source: USDA Food Safety and Inspection Service, Leftovers and Food Safety.