Of, pertaining to, or produced by animals that are allowed to roam freely, rather than being confined indoors.
Sorry, we've been short of free-range chicken since demand rose.
(figuratively) Allowed to move about outdoors without supervision.
2015, Jennifer Miskec & Annette Wannamaker, The Early Reader in Children’s Literature and Culture, ISBN1317394771:
While I have not found corroboration for King's claim, Ivy and Bean series author Annie Barrows has acknowledged that there is a delicate balancing act involved in representing free-range children today