According to the congaree website the synchronized firefly season is over. Put it in your calendar for next year!
Hopefully you're not too late give the Park a call and they should be able to help you with your question
As of one week ago they were very active but, as others have said, contact the park to see how the trend has been. They will give you no guarantee though.
I suggest you check with the park itself. Not sure if it's still in window of time.
I saw 5 Fri.
Dont know call park
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