 If it's over 90 degrees Fahrenheit that day, we recommend that you get your food home ASAP within an hour. Brittany Saunier, executive director of the Partnership for Food Safety Education, also says if you're grilling proteins such as chicken, beef, or pork, consider using a food thermometer. It can be another kind of safety measure. When it comes to salads at your picnic table, you'll want to keep those items on ice.