Congaree National Park: The Tallest Forest in the East

Congaree Swamp. The Redwoods of the East. South Carolina's only national park. By now you can probably guess the mistake people make here, which is skipping it. Here's the turn: it isn't a swamp. A swamp stays wet. Congaree floods, drains, and floods again, roughly ten times a year, and every flood lays down a fresh load of river silt. Feed a hardwood forest that way for a few centuries and you get this: the largest remaining stretch of old-growth bottomland hardwood forest in the country, holding some of the tallest trees in eastern North America. Park #27 of 63 on our US National Parks Scratch-Off Map is the one nobody expects to love.

Know before you go: Congaree sits about a half-hour southeast of downtown Columbia, South Carolina, and entry is free with no fee and no pass required, confirmed on nps.gov as of 2026. Everything starts at the Harry Hampton Visitor Center, where the 2.6-mile Boardwalk Loop steps off a bluff into old-growth forest on an elevated, stroller- and wheelchair-accessible walkway. Roughly 80 percent of the park sits in the Congaree River floodplain, so high water closes trails several times a year: check the Cedar Creek gauge (flood stage near 8 feet) and the park's alerts page before you drive out. Dogs are welcome on every trail here, boardwalk included, leashed at six feet or less.

Quick facts

What does it cost, and do you need to reserve anything?

Nothing, and no. There is no entrance station and no timed-entry system to outsmart. You park, you walk in. Camping is the only routine reservation: Longleaf runs $15 for a tent site and $25 for a group site, Bluff is $10, both through recreation.gov. Backcountry camping is free but needs a permit, requested at least 72 hours ahead. One exception swallows the rest of this, and it happens in May.

How does the synchronous firefly lottery work?

Congaree is one of a few places in North America where fireflies flash in unison, and the show runs about two weeks somewhere between mid-May and mid-June. Access is by recreation.gov lottery. In 2026 the event ran May 13 to 20, the lottery was open April 7 to 14, and 145 vehicle passes went out per night at $1 to enter plus $24 if you won. Dates move every year with the insects, so watch the park's firefly page in late winter. Two things trip people up: during the event, day-use visitors must be off trails and out of the parking lots by 4:30 p.m., and no pets are allowed on event nights (service animals excepted). Phones stay in your pocket in the viewing area. Red-filtered flashlights only, pointed down.

What is it actually like in there?

Quieter than you expect, and much bigger overhead. The boardwalk is the easy introduction and still the best two hours in the park: bald cypress and tupelo standing in dark water, cypress knees pushing up in ranks, loblolly pines running straight past the point where your neck wants to follow. Walk it slowly. The scale doesn't announce itself, it accumulates.

Past the boardwalk the park opens up. Weston Lake Trail (4.5 miles round trip) tracks Cedar Creek where otters and wading birds work the banks. Kingsnake (12 miles) is the birder's pick. Bates Ferry, off Route 601 on the east side, is a flat 2.2 miles down a 1920s ferry road to the river.

Water is the other half of the park. The marked Cedar Creek Canoe Trail runs about 15 miles from Bannister's Bridge to the Congaree River through designated wilderness, and paddling puts you at eye level with the trunks, which is the correct angle for this forest. The park does not rent boats: bring your own, rent in Columbia, or book one of the outfitters authorized to guide inside the park. Most of those trips run about three hours from South Cedar Creek.

Can I do this with a dog?

Yes, and Congaree is unusually generous about it. Leashed dogs (six feet maximum) are allowed on every trail, the boardwalk included, and in both campgrounds. Two cautions come straight from the park. The elevated boardwalk is a confined space with no quick exit, so if your dog is uneasy around strangers, take the Bluff or Sims trail instead. Carolina summers are punishing: carry water for the dog and check both of you for ticks before you drive home. Pets are barred during the firefly event.

Bringing kids?

One of the friendliest parks in the system for young ones. The boardwalk is flat, stroller-rated, lined with benches, and short enough to bail out of at any point, and the wildlife shows up at kid height: turtles, snakes sunning near the walkway, woodpeckers hammering overhead. Grab the self-guided boardwalk brochure at the visitor center and let them lead. Spray the bug repellent before you leave the car, not after. The long wilderness trails are flat but faint in places and easy to lose after a flood. Save those for older kids.

Stay safe

Water is the main variable. Floods arrive with little warning and put most trails under, so check the Cedar Creek and Congaree River gauges plus the alerts page the morning you go, and call the visitor center if you are unsure. From mid-spring to mid-fall the mosquitoes are serious and the ticks are worse. You will probably see snakes. Most are harmless, all are best admired from a distance. Cell service is unreliable, so leave your route with someone and carry a paper map. Hunting is not allowed in the park but does happen on adjacent private land, which is one more reason to stay inside the boundary.

FAQs

Is Congaree National Park free to enter?

Yes. As of 2026 the park charges no entrance fee and requires no entrance pass, and it does not sell America the Beautiful passes on site. The only fees are camping ($10 to $25 a night through recreation.gov), the picnic shelter, and the firefly event. The boardwalk and every hiking trail cost nothing.

When can you see the synchronous fireflies at Congaree?

The display lasts roughly two weeks somewhere between mid-May and mid-June, set by the insects rather than the calendar. In 2026 the event ran May 13 to 20 and required a lottery pass from recreation.gov, with the lottery open April 7 to 14. Check the park's firefly page in late winter for the coming year's dates.

Is Congaree National Park actually a swamp?

No, despite the old name Congaree Swamp National Monument. A swamp holds standing water year-round. Congaree is a floodplain forest that floods about ten times a year when the river tops its banks, then drains. Those pulses of nutrient-rich silt are exactly why the trees grow so tall here.

How much time do you need at Congaree National Park?

Half a day covers the visitor center and the full 2.6-mile Boardwalk Loop at an unhurried pace. A full day lets you add the Weston Lake Trail or a paddle on Cedar Creek, which is the version most people wish they had planned for. Camp a night at Longleaf if you want the wilderness.

Scratch it off: Congaree is park #27 of 63 on the US National Parks Scratch-Off Map, and the cheapest scratch on the whole board. See where it fits with our guide to all 63 parks, or pair it with Great Smoky Mountains, the other eastern park with a synchronous firefly lottery.

Ryan Laboy — Co-founder, McSenderson. Single-digit handicap golfer and ten-year skier based in Flagstaff, Arizona. Researches and designs every McSenderson map. hello@mcsenderson.com