Quick answerDon't spray the ants you see — that only kills foragers and the colony replaces them in days. Place liquid borax bait stations along their trails, let the ants carry the poison back to the nest, and seal entry points. Most infestations clear up in 1–2 weeks.
What you'll need
- Liquid ant bait stations (borax-based, e.g. Terro-style — about $8–$12 for a 6-pack)
- Caulk or sealant for gaps
- White vinegar or soapy water in a spray bottle (for wiping trails)
- Paper towels
- Airtight food containers (for the pantry cleanup)
Step-by-step
- Find the trail, don't destroy it yet. Follow the line of ants to see where they're entering — usually a gap around a window, door, pipe, or baseboard. Knowing the entry point matters more than killing the visible ants.
- Wipe down the foraging surfaces. Mix equal parts white vinegar and water and wipe counters and floors where you've seen trails. This removes the scent trail so new scouts don't keep following it — but leave one active trail intact near where you'll place bait.
- Place bait stations along the trail. Set liquid bait stations right on or next to the active ant trail, near the entry point. Don't move them once ants start feeding — heavy traffic around the bait is exactly what you want to see.
- Resist the urge to spray. This is the hard part. For 3–5 days the ant activity may look worse as more workers swarm the bait. That's the colony feeding. Spraying now ruins everything because repellent sprays scatter the colony.
- Cut off their food supply. While the bait works, store sugar, cereal, pet food, and anything sweet in sealed containers. Wipe up crumbs and sticky spills the same day. Ants that find easier food elsewhere may ignore your bait.
- Seal the entry points. Once activity drops (usually 7–14 days), caulk the gaps where they were coming in. Check window frames, door thresholds, and where pipes enter walls.
- Remove the stations and monitor. After two ant-free weeks, toss the old bait stations. Keep one unopened pack in the cupboard — ants often return seasonally, and you'll be ready.
<div class="safety"> <strong>🛑 Stop and call a pro if:</strong> <ul> <li>You see large black ants (carpenter ants) coming out of wood, window frames, or baseboards — they excavate timber and the damage is structural.</li> <li>Ants keep returning after 3 weeks of proper baiting — the nest may be inside a wall void you can't reach.</li> <li>You find winged ants (swarmers) indoors in large numbers, which usually means a mature nest is inside the house.</li> <li>Anyone in the home has a severe insect-sting allergy and you're dealing with fire ants rather than common house ants.</li> </ul> </div>
DIY vs pro cost
| Option | Typical cost |
|---|---|
| DIY | $10–$20 |
| Pro visit | $150–$300 |
Printable checklist
- [ ] Trace ant trails back to the entry point
- [ ] Wipe foraging surfaces with vinegar solution
- [ ] Place liquid bait stations on the active trail
- [ ] Do NOT spray insecticide near the baits
- [ ] Seal pantry food in airtight containers
- [ ] Caulk entry gaps after activity stops
- [ ] Remove old stations after 2 ant-free weeks
Related guides
- How to Get Rid of Mice (Traps, Sealing Entry Points)
- How to Get Rid of Cockroaches Permanently (Pro Method)
- How to Remove a Wasp Nest Safely (Small Nests Only)
Frequently asked questions
How long does it take for ant bait to work?
Expect noticeably fewer ants within 3–5 days and near-total clearance in 1–2 weeks. The bait has to travel through the whole colony, including the queen, so it's slower than spray but permanent — spray only kills the ants you can see.
Are liquid ant baits safe around pets and kids?
The borax concentration in consumer baits is low, but the stations should still go where pets and small children can't reach them — behind appliances, inside cabinets, or along baseboards behind furniture. If a pet eats a whole station, call your vet.
How do I know if they're carpenter ants?
Carpenter ants are noticeably bigger (up to half an inch), usually black or reddish, and you may find fine sawdust-like shavings near where they're active. Sugar ants are tiny. If you're seeing big ants around woodwork, skip DIY and get an inspection.
Why do the ants keep coming back every spring?
Scout ants probe the same entry points year after year, and outdoor colonies send new foragers each warm season. Re-caulking entry gaps each spring and keeping one bait station near last year's entry point usually stops the cycle.
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