The term "closed season" typically refers to a period of time during which hunting, fishing, or harvesting of a particular species is prohibited by law to protect their population. Antonyms for "closed season" include "open season," which is a period when hunting, fishing, or harvesting is allowed, and "year-round," which means there are no restrictions on harvesting throughout the year. Other antonyms may include "unrestricted," "unregulated," or "free-for-all," which imply that there are no limitations or regulations on the harvesting of a particular species. It is important to respect these seasonal regulations to ensure the sustainable management of wildlife populations.