Yes. If you leave roasted vegetables to stand overnight, you have to put it in the fridge. And we suggest you put it in a bowl with a lid or at least cover the bowl with foil. Although it is said that vegetables will last in the refrigerator for up to 3 days, we believe it is safe to keep them in the fridge for only one day and consume them. The longer you store roasted vegetables, the more saturated and gooier they will be. For more extended storage, we suggest you freeze them. Simply arrange veggies in freezer bags but don't squeeze them altogether.