how long can you keep lasagna leftovers
Report Abuse. You can freeze some if you like. I'd transfer it to an airtight container or wrap in foil and then put it in a freezer bag. Your lasagna should keep for four or five days in the back of the fridge.f food has been left out for more than two hours, as a general rule, it should be discarded (it depends on the monitoring of the temperature...but up to 6) . When eating leftovers, the USDA advises reheating them to 325 degrees F. Reheating food to 325 degrees F or a higher temperature will eliminate bacteria.