March: Before the mosquitoes and humidity of summer, Congaree's old-growth floodplain forest is at its most pleasant. Spring green-up starts under some of the tallest trees in the East.
May: Synchronous fireflies flash in unison in Congaree's floodplain forest from about mid-May to mid-June. It's one of only a few places in North America where they happen.
November: Cool weather and very few mosquitoes: late fall is the best time to walk Congaree's old-growth forest and paddle Cedar Creek.
Permits and reservations
No entry reservation. Campgrounds need a reservation.
Backcountry camping permit: Free permit, requested by emailing the park at least 72 hours before your trip.
Longleaf & Bluff campgrounds: Everyone camping in a frontcountry campground needs a reservation through Recreation.gov (or 1-877-444-6777).