What Is the Best Food for Free Range Chickens? At BackyardChickenNews, we help people who want to raise backyard chickens by collating information and news blended with our own personal experiences. There are several options for feeding your free-range chickens, and each has advantages and disadvantages. Some chickens are allergic to some types of food, so it’s important to know which is right for your flock. These foods include mixed corn, Layer feed, Fruits, and Vegetables.