How to Get Rid of Ants in Fresno

Ants are the most common pest call in Fresno, and the one people most often make worse by accident. That line of ants marching across the counter is a trail of foragers — a tiny fraction of a colony that is nested somewhere else entirely, often outdoors. The instinct is to spray the trail, which feels satisfying and is exactly the wrong move for the ant we see most here. This guide covers the ants you will actually run into in the Central Valley, how to get rid of them without multiplying the problem, and when it is time to call a pro.

The ants you will see in Fresno

Argentine ants — small, brown, and the dominant nuisance ant in the Central Valley. They form enormous interconnected supercolonies with many queens, which is exactly why spraying backfires: it just causes them to split and spread.

Odorous house ants — small and dark, they give off a musty, coconut-like smell when crushed and are drawn to sweets.

Pavement ants — nest under driveways, sidewalks, and slabs, and trail indoors along the edges.

Carpenter ants — larger and usually black. These are a different problem: they tunnel into damp or damaged wood and can cause structural damage, so they need a targeted approach, not just bait.

An Argentine-ant trail. The ants you see are foragers — the colony, often with many queens, is nested elsewhere.

Why ants come inside

Ants come in looking for two things: water and food. Fresno’s hot, dry summers push them indoors toward moisture — sinks, drains, and pet bowls — while sugars, grease, and crumbs draw them to the kitchen. Swings in weather, including heavy heat and yard irrigation, drive them in too. They enter through tiny gaps around windows, doors, pipes, and slab edges, and once a forager finds food it lays a chemical trail for the rest to follow.

How to read the trail

That visible line is your best information, not your enemy. Foragers travel between the nest and the food along a pheromone trail; the ants around a pet bowl, sink, or sweet spill are recruiting more workers. Winged ants — swarmers — mean a mature colony is nearby and producing reproductives. Nests are usually outdoors in soil, mulch, or under the slab, or tucked into a wall void.

How to get rid of ants yourself

For a typical ant trail, DIY can work well — if you resist the urge to spray and let the colony do the work for you.

1. Do not spray the trail. Repellent sprays kill the foragers you see but signal an Argentine-ant colony to split and relocate — a process called budding — turning one nest into several. The trail is your roadmap to where they are getting in. Use it; do not erase it yet.

2. Put down slow-acting bait. Place gel or liquid ant bait right along the trail and at the entry points. Foragers carry it back and feed the colony and the queen, which is what actually kills the nest. It takes days, and seeing more ants at the bait at first is good — they are recruiting to it. Never spray over your bait.

3. Then erase the trail. Once the bait is working, wipe trails with soapy water or a vinegar solution to remove the pheromone, and clean up the food and standing water that drew them in.

4. Seal the entry points. Caulk gaps around windows, doors, pipes, and baseboards where the trail comes in. This removes the highway, not just the traffic.

5. Deal with the outside. Most ants nest outdoors, so trim vegetation and tree limbs touching the house, move mulch and firewood away from the foundation, and address the perimeter where they are entering.

When it is past DIY

DIY handles a lot of ordinary ant trails. It tends to fail against established Argentine-ant supercolonies that keep coming back, ants pouring from a wall void or under the slab where you cannot reach the nest, several trails or rooms at once, and carpenter ants, which damage wood and need a targeted treatment. Recurring invasions every spring and summer are another sign the nest is never actually being reached.

How the pros clear it

Our ant control starts by identifying the species, because the fix depends on it. We use non-repellent products the ants cannot detect — so they walk through and carry it back instead of avoiding it — combined with targeted baiting that reaches the colony and the queens, treatment of nests and entry points, and an exterior barrier where they are coming in. For Argentine-ant pressure we plan for follow-up, because supercolonies are persistent. The goal is the nest, not the trail.

See our ant control process →

How to keep ants out

Once they are gone, prevention is about food, water, and gaps. Keep the kitchen clean and dry, wipe up spills quickly, store food sealed, and fix leaks and damp spots. Seal entry points, and keep the exterior unfriendly — mulch and vegetation off the foundation, limbs off the roof. In neighborhoods with heavy Argentine-ant pressure, a recurring perimeter service is usually what keeps them from re-establishing each season.

Ant control FAQ