Are Fireflies Going Extinct? Status, Causes, and Comebacks

North American firefly species at risk: 1 in 3 ·
U.S. firefly taxa threatened with extinction: 18 ·
Total firefly species in the United States: Over 175 ·
Adult firefly lifespan: 3-4 weeks ·
Firefly larval stage duration: 1-2 years ·
Main threat factor: Light pollution disrupts mating

Of 175 North American firefly species, the pattern is clear: not all are in trouble, but those that are face serious, compounding pressures.

The snapshot table below summarizes the key numbers.

The implication: localized extinction is a real risk, but global extinction is not imminent.

Are fireflies becoming endangered?

Are fireflies going extinct?

Fireflies are not known to be going globally extinct in 2025, but multiple sources describe widespread declines and elevated extinction risk for some species, according to the University of Georgia Extension (cooperative extension service). A 2024 review published in PMC (peer-reviewed scientific journal) found that about 20% of the 150 firefly taxa assessed by the IUCN Red List face heightened extinction risks. However, those 150 represent under 7% of the roughly 2,600 known firefly species worldwide — meaning we lack data on the vast majority.

Is there an extinction of fireflies?

The Xerces Society (invertebrate conservation nonprofit) reports that one in three assessed North American fireflies may be at risk of extinction if data-deficient species follow similar patterns. Specifically, 14% of assessed firefly species were categorized as threatened with extinction, with nearly half classified as data deficient.

Why are fireflies getting extinct?

Are fireflies going extinct because of light pollution?

The U.S. Fish & Wildlife Service (federal wildlife agency) identifies light pollution as a key driver: it interferes with firefly mating rituals and lowers reproductive success. Fireflies use bioluminescent flashes to attract mates, and artificial light outcompetes those signals.

What are the main threats to firefly populations?

Major threats identified in the literature include habitat loss and degradation, artificial light, broad-spectrum insecticides, overtourism, drought, sea level rise, and broader climate change, according to the PMC review. Habitat loss — especially loss of leaf litter and tall grasses — reduces the food and space fireflies need. Pesticide exposure can disrupt firefly metabolism and development during egg and larval stages. Ben Pfeiffer of Firefly Conservation and Research (specialist research group) says fireflies are disappearing in many areas mainly due to habitat loss from residential, commercial, and industrial development.

Are we really the last generation to see fireflies?

Why are we the last generation to see fireflies?

A study discussed by the University of Georgia Extension says there is no scientific evidence supporting the claim that humans are the last generation to see fireflies. They acknowledge that firefly sightings are decreasing in many regions, but the extinction risk is not uniform. Some species have declined by 50% in recent decades, while others remain stable.

Is it rare to see a firefly?

In parts of the Southeast, mid-Atlantic, and Southwest of the United States, declines are often most visible in species with narrow geographic ranges (Garden for Wildlife conservation blog). In other areas — especially where habitat remains intact — fireflies can still be abundant.

Why are fireflies making a comeback?

SWARMS OF FIREFLIES RETURN TO ILLINOIS

In 2025, large swarms of fireflies returned to Illinois after conservation efforts, as reported by See the Wild (wildlife news outlet). The comeback is tied to habitat restoration, reduction of light pollution, and reduced use of pesticides in some areas. Ben Pfeiffer notes that fireflies are doing well in places where they are protected.

Are fireflies making a comeback in the US?

Yes, but not everywhere. The swarms in Illinois are a localized success story. Restoration of natural habitats, especially along rivers and wetlands, has allowed some species to rebound. The U.S. Fish & Wildlife Service recommends reducing outdoor lights, planting native plants, mowing less frequently, keeping leaf litter, and avoiding pesticides to help fireflies.

What is the lifespan of a firefly?

How long do fireflies live?

Adult fireflies live only 3-4 weeks — just enough time to mate and lay eggs. The larval stage, however, lasts 1-2 years (U.S. Fish & Wildlife Service). During this long underground phase, larvae feed on snails, slugs, and other soft-bodied invertebrates.

What do fireflies eat?

Fireflies are predatory for most of their lives. As larvae they hunt snails and small insects. Some adult fireflies don’t feed at all; others eat nectar or pollen. Fireflies are beetles (family Lampyridae), not flies — a common misconception.

How to help fireflies in your backyard

Individual actions can directly support local firefly populations. Based on recommendations from the U.S. Fish & Wildlife Service (wildlife authority) and the Xerces Society (conservation nonprofit), here are five effective steps:

1. Reduce outdoor lighting. Turn off unnecessary lights or use motion sensors and warm-colored bulbs that don’t interfere with firefly signals.
2. Let leaf litter stay. Firefly larvae live in leaf litter and decaying wood. Leave some fall leaves and woody debris in your garden.
3. Mow less frequently. Tall grasses and undisturbed edges provide cover for larvae and adult fireflies.
4. Plant native plants and trees. Native vegetation supports the snails and slugs that firefly larvae eat.
5. Avoid broad-spectrum pesticides. Many lawn and garden chemicals harm firefly larvae directly or kill their prey.

Timeline of firefly decline and recovery

• 1990s: Firefly decline first noted in scientific literature (Xerces Society).
• 2000-2010: Urbanization increases threat as development expands (U.S. Fish & Wildlife Service).
• 2020: IUCN starts assessing fireflies systematically.
• 2024: 1 in 3 North American firefly species found at risk (Xerces Society).
• July 2025: Large swarms return to Illinois after conservation efforts (See the Wild).

What we know and what remains unclear

Expert perspectives on firefly futures

“Habitat loss and degradation are the biggest threats to fireflies, followed by light pollution, pesticide use, and climate change.”

— Candace Fallon, Xerces Society (invertebrate conservation nonprofit)

“Fireflies are disappearing in many areas mainly due to habitat loss from residential, commercial, and industrial development. But they are doing well in places where they are protected.”

— Ben Pfeiffer, Firefly Conservation and Research (research group)

The pattern is clear: firefly extinction risk is real but uneven. The species most at risk are those with narrow ranges and specific habitat needs. For conservationists and homeowners, the choice is equally clear: protect larval habitat, turn off unnecessary lights, and avoid pesticides. The Illinois swarms show that recovery is possible — but only where we actively make room for beetles.

Frequently asked questions

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