How to Get Rid of Ants: Complete Extermination Guide

Why Ants Are So Hard to Get Rid Of

Killing the ants you see accomplishes almost nothing. A visible trail represents maybe 1% of the colony. The queen and the brood stay hidden, sometimes hundreds of feet away, and they’ll replace the lost workers in days.

The only way to end an ant problem is to eliminate the colony at its source. This changes everything about how you treat them.

Step 1: Identify the Species

Different ants require different approaches.

Odorous House Ants

1/8 inch long, brown or black
Crushed ants smell like rotten coconut
Follow trails along baseboards and counters
Nest in walls, under floors, and outdoors

Treatment: Sweet-based gel baits work well. They’re a common target for DIY success.

Pavement Ants

1/8 inch long, dark brown
Nest under sidewalks, driveways, and foundations
Leave small dirt piles from excavation

Treatment: Protein-based baits, perimeter treatment.

Carpenter Ants

1/4 to 5/8 inch long, usually black
Do not eat wood but tunnel through it
Leave sawdust-like frass near activity
Active at night

Treatment: Serious — they cause structural damage. Usually requires professional treatment.

Pharaoh Ants

1/16 inch long, yellow to light brown
Spread through hospitals, offices, and apartments
Spraying causes them to “bud” into new colonies

Treatment: Strictly bait-based. Never spray insecticide — you’ll make it worse.

Fire Ants

1/8 to 1/4 inch long, reddish
Aggressive, painful sting
Build visible mounds in yards

Treatment: Multi-step approach combining broadcast bait and mound treatment. Often needs professional help.

Step 2: Find the Source

Watch the trail. Ants travel in remarkably direct lines to and from food. Follow them back to where they enter your home. Common entry points include:

Cracks in the foundation
Gaps around window and door frames
Weep holes in brick siding
Utility penetrations (cable, plumbing, electrical)
Tree branches touching the roof

Outdoors, look for the nest near the entry point. Carpenter ants often nest in rotting wood, tree stumps, or damp framing.

Step 3: Use the Right Bait

Baits are the gold standard for ant control because workers carry poisoned food back to the colony, killing the queen and brood.

How to Bait Effectively

Place bait stations directly on ant trails
Use multiple stations — a dozen is not excessive
Do not spray or kill the ants visiting the bait
Keep kids and pets away from stations
Rotate bait types if one stops working (ants often switch food preferences)

Bait Types

Sugar-based gel baits: Most sweet-feeding ants
Protein-based baits: Pavement and fire ants during their protein season
Grease-based baits: Grease-feeding ants

Active ingredients to look for: borax, fipronil, indoxacarb, or hydramethylnon. Effective over 7 to 14 days, not instantly.

Step 4: Seal Entry Points

Once you’ve broken the colony, close the door behind them.

Caulk cracks in the foundation and around siding
Install door sweeps on exterior doors
Seal gaps around pipes and cables entering the home
Fix torn window screens
Check that weep holes have proper screening

Step 5: Eliminate Attractants

Ants stay where food is easy. Remove the invitation:

Store food in sealed containers, including pet food
Wipe counters and sweep floors daily
Empty trash regularly and rinse recyclables
Clean up spills, especially sugary ones, immediately
Fix plumbing leaks — water is as attractive as food
Keep outdoor trash bins away from the house
Trim vegetation back from the foundation

Things That Don’t Work

Spraying visible ants: Kills the visible 1%, leaves the colony intact, sometimes makes it worse
Vinegar and essential oils: Disrupt trails briefly but don’t affect the colony
Cinnamon and chalk lines: Deterrents at best, useless for active infestations
Boiling water on mounds: Kills some, disperses others, often doesn’t reach the queen
DIY pesticide fogs: Don’t penetrate the nest; often make pharaoh and Argentine ants worse

When to Call a Professional

DIY works for many small odorous house ant or pavement ant infestations. Call a professional when:

You suspect carpenter ants (structural risk)
Pharaoh ants are present (budding makes DIY risky)
Fire ants are established in the yard
DIY baits haven’t worked after 3 to 4 weeks
Ants return year after year
You see multiple species at once

A pro can identify species accurately, use commercial-grade products, and develop an integrated pest management plan. Learn more about pest control costs and when to choose DIY vs professional.

Prevention After Treatment

Once the colony is gone, prevention is almost entirely about moisture and sanitation:

Maintain a dry perimeter around the foundation
Address plumbing leaks quickly
Keep firewood and mulch away from the house
Trim tree branches that touch the roof
Schedule annual pest inspections

See our pest control for new homeowners guide for a complete prevention plan.

Ready to End the Invasion?

If DIY methods have failed or you’re facing carpenter ants, don’t wait. Trusted pest control professionals can identify the colony and eliminate it for good.

Get a free quote and reclaim your kitchen.