Synchronous Fireflies Smoky Mountains 2024 Cast. Congaree national park holds an annual event for visitors to view the fireflies, which blink for a few weeks every may and june. Synchronous fireflies ( photinus carolinus) are one of at least 19 species of fireflies that live in great smoky mountains national park.
Each species develops a pattern that allows females to spot the. You can’t just show up and watch the display.