Sep 27, 2022· According to Hale, these reefer trailer temperature ranges are considered the best for the following types of produce: 32-36˚F for greens, berries, apples, cruciferous vegetables, grapes, and stone fruits. 38-40˚F for avocados and cranberries. 40-45˚F for potatoes, green beans, and sweet potatoes. 45-50˚F for watermelon, cucumbers, some ...