It depends on the specific electric grill and its design. Some electric grills are designed to be used outdoors and can be left outside, while others are designed for indoor use only and should not be left outside. Before leaving your electric grill outside, check the manufacturer's instructions to see if it is suitable for outdoor use. Additionally, it’s always a good idea to cover your grill when it’s not in use to protect it from the element and extend its lifespan.