Earlier quoted context omitted.
I didn't realize all fireflies didn't tend to synchronized. Fun read. Fireflies are one of the only "bugs" from the south that I miss. Cicadas, I suppose, have a bit of a soft spot with me. Everything else... nope.
How far north are you? We get them around Albany, NY. The big thing is having a forest-meadow boundary, where fallen leaves aren't removed. If you're surrounded by grass lawns & concrete where people rake & remove the leaves fireflies could lay their eggs in, you won't get fireflies.
Fair, it is not "north" that is my limiting factor. It is being in the Pacific North West. As another poster has said, we have some glowing bugs. Nothing like fireflies, though.
And I hasten to add, plenty of other amazing creatures.