Antlions live on every continent except Antarctica, thriving wherever they can find dry, fine-grained soil or sand and enough warmth to stay active. About 2,000 species exist worldwide, with roughly 100 of those in North America alone. Their habitat needs are surprisingly specific, and understanding them explains why you might find tiny cone-shaped pits under your porch but never in your garden bed.
Global Range and Climate Zones
Antlions are most diverse and abundant in tropical and subtropical regions, but they extend well into temperate climates too. They inhabit open, sandy habitats across Africa, Europe, Asia, Australia, and the Americas. In Europe, populations concentrate in sand steppes and dry grasslands, habitats that have been shrinking due to agriculture and tree planting. In South Africa, certain antlion species serve as ecological indicators for open landscapes without trees or shrubs, meaning their presence signals a healthy, undisturbed sandy environment.
In North America, antlions are found throughout the United States, with documented populations in states ranging from Florida and Mississippi to New Jersey, Ohio, and Indiana. They also occur in Mexico and as far south as Argentina. The common thread across all these locations is access to loose, dry soil and a climate warm enough to support their long larval stage.
Temperature Limits for Survival
Antlion larvae stop building their signature pit traps when temperatures drop below about 10°C (50°F) or climb above 42°C (108°F). That’s a wide tolerance, which helps explain their broad geographic range. In Poland’s Błędowska Desert, one of the northernmost populations in Europe, antlions are active from May through October when average temperatures sit around 14°C, though they endure overnight lows that occasionally dip below freezing. Warmer climates allow year-round activity, which is why antlions are most commonly encountered in the southern United States, the Mediterranean, and the tropics.
The Soil They Need
Soil type matters more to antlions than almost any other factor. Larvae strongly prefer fine, dry sand with grain sizes between 125 and 250 micrometers, roughly the texture of table salt or fine beach sand. Coarser or wetter substrates make pit construction difficult because the walls collapse unpredictably or hold together too firmly for the larva to excavate. During digging, larvae actually sort the sand by flicking out larger grains, gradually refining the pit walls to the smallest, most unstable particles. This creates the perfectly steep funnel that sends prey sliding to the bottom.
Moisture is a dealbreaker. Antlion pits function only in dry sand, typically at ambient humidity levels around 38 to 42%. Wet sand sticks together and won’t avalanche, which defeats the entire trapping mechanism. This is why you’ll never find antlion pits in irrigated soil, damp clay, or areas with regular rainfall exposure.
Where Larvae Build Their Pits
Because rain destroys their traps, antlion larvae are drawn to sheltered spots. In natural settings, that means the base of hedgerows, under rock overhangs, along the edges of sandy paths in dry forests, and on mature sand dunes that stay relatively stable. The key is a combination of fine sandy soil and overhead protection from weather.
Around homes, larvae gravitate to the same conditions. The most common residential locations include the dry soil underneath roof eaves, along foundation walls, beneath porches and decks, and at the base of trees where the canopy blocks rain. If you’ve noticed small funnel-shaped pits in the sand near your house, they’re almost certainly in a spot that stays dry even during storms. These sheltered patches of bare, loose soil are prime real estate for antlion larvae, and a single patch can host dozens of pits spaced just a few centimeters apart.
Pit diameters typically range from 6 to 10 centimeters across, though size varies with the age of the larva and the quality of the sand. Larger, older larvae build wider, deeper funnels.
Where Adult Antlions Live
Adult antlions look nothing like their larvae. They resemble delicate, slender dragonflies with long, clear wings, and their habitat needs shift completely after they emerge. Adults are weak, clumsy fliers that are most active at dusk and night. They’re commonly attracted to porch lights and streetlights, which is how most people encounter the winged stage without realizing it’s the same insect responsible for those sand pits.
Adults spend their brief lives (a few weeks to a couple of months) in vegetation near the sandy areas where they grew up. Females return to suitable sandy soil to lay eggs, completing the cycle. Because adults fly poorly and don’t travel far, antlion populations tend to stay concentrated in the same patches of habitat generation after generation. If you find larval pits in one spot, they’ll likely reappear in the same location year after year as long as the soil stays dry and undisturbed.
Why Certain Areas Lose Their Antlions
Antlion populations are declining in parts of Europe where their preferred open sandy habitats are disappearing. Sand steppes and dry grasslands have shrunk dramatically due to agricultural development, deliberate tree planting on formerly open land, and the natural encroachment of vegetation when grazing or other disturbances stop. When trees and dense ground cover take over, the bare sandy patches antlions depend on vanish. The soil becomes shaded, root-bound, and too moist, and the fine loose surface layer gets buried under organic matter.
In residential areas, heavy landscaping, irrigation systems, and the replacement of bare soil with mulch or gravel can eliminate local antlion habitat. Conversely, leaving patches of dry, bare sandy soil undisturbed, especially in sheltered areas near structures, is all it takes to support them.