"Given the fact that South Carolina has notoriously mild winters, Congaree National Park is open year-round — and travelers can plan their trip based on what they most want to see. Those visiting in the fall may miss the annual synchronous firefly mating season that occurs in the spring, but they will get to witness the foliage that peaks at the end of October and early November. Not to mention, the lower temperatures make paddling Cedar Creek or hiking Kingsnake Trail more palatable." - Travel + Leisure Editors