Pavement Ant

What it looks like

• Small, uniformly dark, ~1/8" long
• Two nodes between thorax and abdomen (a key ID point vs. carpenter ants)
• Faint parallel grooves on the head and thorax
• Workers all the same size (unlike carpenter ants)

Where you'll find it

• Under driveways, sidewalks, patios, and slab foundations
• Beneath landscape rocks, brick edging, and stepping stones
• Wall voids and under tile or laminate flooring
• Kitchen counters and pet food bowls (foraging trails)

Behavior & biology

Pavement ants nest in soil under flat hard surfaces, where the slab traps heat. Colonies have 3,000–10,000 workers and a single queen. They eat almost anything — grease, sugar, dead insects, pet food, seeds. Two neighboring colonies will fight 'pavement ant wars' on driveways in spring, leaving piles of dead workers.

Iowa activity calendar

Signs of an infestation

• Small piles of fine soil in cracks of driveways, sidewalks, and patios
• Long trails of small dark ants on counters, stoves, and floors
• Activity concentrated near slab edges, expansion joints, and garage thresholds
• Dead ants in clusters in spring (territorial wars)

Health & property risk

Pavement ants don't bite, sting, or damage wood. The risk is contamination — they walk on garbage, pet waste, and dead insects, then onto food prep surfaces.

How we treat it

1. 1

   Bait the trails

   We use slow-acting sweet and protein baits placed on active trails so workers carry it back to the queen.

2. 2

   Treat slab edges + cracks

   We apply non-repellent insecticide along expansion joints, slab edges, and the garage threshold — the actual nest entrances.

3. 3

   Exterior perimeter band

   A 3-foot perimeter band around the foundation prevents new colonies from establishing.

Why DIY usually fails

Dust-style ant killers and cinnamon won't reach the queen. Liquid baits work but only if you don't also spray repellent — the two products fight each other.

FAQ