Fireflies usually don’t disappear in winter; most spend the cold months hidden as larvae or eggs in soil, leaf litter, or decaying wood, while a few species overwinter as adults under tree bark or in bark crevices.

Quick Scoop

Most firefly species survive winter by slowing down or pausing development in protected microhabitats like:

  • Soil and leaf litter.
  • Under loose tree bark.
  • Inside rotting logs or other sheltered wood.
  • In some species, as adults clustered on trees or bark.

What they do

For many species, the winter stage is the larval stage, which is more cold-tolerant than the flashy adult stage.

Some species enter a dormant state called diapause, which helps them conserve energy until temperatures rise again.

A small number of “winter fireflies” are active as adults even in late winter or early spring, especially around tree trunks and bark cracks.

Simple answer

So the short answer is: fireflies go into hiding, not away.
They wait out winter in sheltered places and reappear when spring warmth returns.

TL;DR

Most fireflies spend winter as larvae underground or in leaf litter, while a few overwinter as adults under bark or on tree trunks.