We've seen almost as many fireflies this year than we used to see in the summers we spent as (young) researchers near the Chesapeake Bay in Maryland, many years ago.
They're flashing again tonight, at all canopy levels. It's probably the tail end of the mating season; they're definitely not as as abundant as earlier in June. Fireflies are a seasonal component of living in the eastern U.S. - special, to be sure.
It's certainly been a firefly June in the mountains of western North Carolina!