Synchronous Fireflies at Congaree

Fireflies blink along the forest floor at dusk
Synchronous Fireflies light up the forest at dusk. (NPS Photo)
Updated on April 20, 2022

2022 Synchronous Fireflies Viewing Event (May 20-22 and May 27-29)

In order to protect critical firefly habitat and provide optimum visitor experience, viewing will be limited to 120 vehicles per night. Tickets will be required to enter the park in the evenings on those dates and will be available through a lottery system hosted at

PLEASE NOTE: All questions or technical assistance requests concerning the lottery should be directed to (877-444-6777), as the park does not manage the lottery system.

The lottery will open at 10:00 a.m. EDT on March 31 and will remain open until 10:00 a.m. EDT on April 6, with results announced on April 14. A non-refundable service fee of $1 will be charged by to enter the lottery. Participants selected through the lottery will be required to pay a $19 non-refundable event fee to secure tickets ($20 total). Tickets will only be issued for passenger vehicles up to two axles that can fit in standard parking spaces (i.e. no motor homes, vehicles with trailers, buses or mini-buses).

To further protect critical firefly habitat, the park entrance road will be closed to all visitors at 4:00 p.m. nightly beginning on Sunday, May 15 through Sunday, May 29. On those dates, visitors will not have access to the Harry Hampton Visitor Center, frontcountry trails including the boardwalk, or the Cedar Creek Canoe Trail between Bannister Bridge and Cedar Creek Canoe Landings after 4:00 p.m. However, the following areas of the park will remain open to the public on those evenings: Cedar Creek downstream from the South Cedar Creek Canoe Landing, Bates Ferry Trail, Fork Swamp Trail and all the park's backcountry east of Bridge “J” on Kingsnake Trail In order to prevent overcrowding in wilderness areas, backcountry camping permits are no longer being issued for dates between May 15-May 29.

General Fireflies Viewing Information:

Because of the large numbers of participants expected for this event, the following are prohibited on the Fireflies Trail:

  • Dogs (service dogs allowed)

  • Strollers or wagons

  • Flash photography

  • Headlamps

  • Using Smartphones as Flashlights

  • Chairs, hammocks or blankets

  • Smoking/Vaping

  • Alcoholic beverages

  • Applying insect repellant (please apply prior to arriving at the park)

Participants are asked to observe the following viewing etiquette:

  • Keep noise levels to a minimum so that everyone can enjoy this special natural occurrence.

  • Capturing fireflies is not allowed within Congaree National Park.

  • Stay on the designated trail (walking off trail can adversely impact firefly habitat).

  • Wear sturdy, close-toed shoes (roots and biting insects may be present)

  • Only use flashlights when absolutely necessary, pointing them straight down so as to not disturb other participants (Small penlights are recommended).

Other important information about the Congaree Fireflies Festival:

  • Be prepared for the weather. Thunderstorms often occur in the evenings during May.

  • The best time to view the fireflies is just after dark, usually between 9:00pm and 10:00pm.

  • Because of the high volume of permits already issued and in order to prevent overcrowding in backcountry areas, backcountry camping permits are no longer being issued for dates between May 15-May 29. Backcountry campers who have been issued a valid backcountry camping permit for dates during this period must park their vehicles and access the backcountry from parking lot at the South Cedar Creek Canoe Landing.
  • Frontcountry camping at Longleaf and Bluff Campgrounds will only be available on May 20-22 and May 27-29 during the event (individual sites only; no group sites will be available during the event). All campers on these nights must park at the Longleaf Campground parking lot after 4:00pm nightly. Campsite reservations must be made through
  • If you have a specific question not otherwise answered on this page, please e-mail us

Timeline of how the Congaree Fireflies Viewing Event has grown and changed over the past few years:

  • Pre-2014: The fireflies have been observed for many years. Some locals and visitors know about the synchronous phenomenon, but it is not an event. A long-term decline in firefly populations coupled with increasing light pollution, however, make such experiences increasingly rare for many.
  • 2014-2016: Park staff begin noticing a marked increase in the numbers of visitors coming to the park to see the fireflies. Law enforcement rangers begin staying late on evenings to monitor the situation. Reports of habitat disturbance and frequent visitor complaints about the noise and light pollution from other visitors are recorded. Visitors are observed parking on the Entrance Road, making it nearly impossible for emergency vehicles to have access to the park. Most visitors are from the local area.
  • 2017: Extended hours are implemented for the Harry Hampton Visitor Center, which stayed open till 9:00pm for eleven days. The Fireflies Festival was a one day event. Several hundred visitors attend the festival.
  • 2018: Visitor Center hours are extended to 10:00pm nightly and the Fireflies Festival becomes a ten day event. A designated Fireflies Trail is created to protect firefly habitat and to offer visitors unobstructed views of the fireflies. The Boardwalk is reserved for visitors with mobility issues. Park staff, volunteers and community partners conduct parking operations to assist visitors with parking along the Entrance Road. Several thousand visitors attend the festival. In addition to local residents, more and more visitors are starting to come from the surrounding region for the event.
  • 2019: Park staff manage the firefly festival through the Incident Command System for the first time, which is a standard approach for government agencies and partners to manage complex events (i.e. natural disasters, major events, etc.). Park staff create a roadside pedestrian walkway and institutes full traffic control operations to prevent vehicle-pedestrian encounters. Park successfully pilots a shuttle program with COMET during Memorial Day Weekend to bring visitors into the park from the State Fair Grounds in Columbia. Paramedics are on duty for the entire event. 12,000+ visitors attend the 18-day Fireflies Festival. Visitors are coming from all across the nation for the event and media requests are coming in from as far away as Europe.
  • 2020: Due to the COVID-19 pandemic, Congaree National Park was closed to the public during what would have been the 2020 Fireflies Festival. This presented a unique opportunity to conduct targeted research on fireflies and their habitat. Through this research, the park hopes to better understand firefly behavior and to help park management improve visitor experience through being able to offer more accurate forecasts of when "peak activity" will occur in future years.
  • 2021: In order to protect critical firefly habitat and to provide a safe and enjoyable experience to visitors, the park begins using a lottery system and charging a fee for the event. This system is modeled on the one that has been successfully used by Great Smoky Mountains National Park for a number of years for that park's firefly event.

With over 2,000 species found world-wide, there are only three species of synchronous flashing fireflies that can be found in North America. Every year, Congaree National Park hosts synchronous fireflies for approximately two weeks between mid-May and mid-June. During this time visitors can experience an awe-inspiring display of synchronous flashing while the fireflies search for a mate. For information on the scientific research of fireflies at Congaree National Park, be sure to visit the Old Growth Bottomland Forest Research and Education Center's fireflies page.


Last updated: April 20, 2022

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