Overnight oats are generally good for up to 5 days when stored in an airtight container in the refrigerator. However, their freshness and texture depend on the ingredients used. Plain overnight oats without fruit or dairy tend to last up to 5 days. Adding fruit, especially berries, reduces this time to around 2-3 days as the fruit can get mushy and spoil faster. If yogurt is included, oats should also be eaten within 5 days, but fruit toppings should still be consumed sooner. The oats may soften and the liquid may separate over time but are safe to eat as long as there are no sour smells, mold, or off tastes.
