How long will apple crisp keep? It will be ok for about 3-4 days at room temperature.Click to see full answer. In this regard, does leftover apple crisp need to be refrigerated?If you don’t like eating it cold, you can always pop it back in the oven (set very, very low, or just using leftover heat from whatever you made for dinner) before you eat it. Refrigerate it. The cooked apples and the oat-ty topping are both extremely hazardous foods at room temperature.Likewise, does berry crisp need to be refrigerated? Make Ahead: The topping needs to be refrigerated for at least 1 hour and up to 2 days. The pre-baked topping can be stored at room temperature for up to 2 days. Similarly one may ask, can Apple Crisp be stored at room temperature? Cover with plastic wrap with a few holdes poked in the top to keep it from getting soggy. Frankly, though, there’s nothing in an apple crisp that’s not in an apple pie and a pie certainly keeps overnight. Nonetheless, if you have the room in the fridge, probably better to be safe.Can you refrigerate apple crisp before baking?This apple crisp with oatmeal topping can be baked 1-2 days ahead and stored in the fridge. When you are ready to reheat, simply pop it in the oven at 350°F for 25-30 minutes, until warmed through.