How to Get Rid of Ants in Texas Homes | Pest Guide

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The fastest way to get rid of ants in a Texas home is to identify the species first, then bait the colony instead of spraying it. If you spray a trail of sugar ants on your kitchen counter, the colony splits and you end up with three trails next week instead of one. Sounds counterintuitive right. But thats the single biggest mistake homeowners make with ants in Central Texas, and it’s the reason most people end up calling a pro after a month of fighting the same trail.

According to Texas A&M AgriLife’s Fire Ant Research and Management Project, the Two-Step Method (broadcast bait first, mound treat second) has been the recommended approach for fire ants for over two decades. For sugar ants on your counter, Texas A&M Extension’s general guidance for indoor trail ants is the same. Bait. Don’t spray. (Texas A&M Insects in the City covers ID; control specifics live in Extension publication B-6183.)

I am not an entomologist. I sell houses for a living. But I asked my pest guy, who treats homes in West Austin, Lakeway, Bee Cave and Dripping Springs, what he actually does when he gets called out for ants. This is what works.

This is the first post in our new “I Asked My Pest Guy” series, which lives next to I Asked My Plumber. The idea is simple. There are jobs where a pro will charge you $300 and you could have done it yourself for $30, and there are jobs where a pro will charge you $300 and save you $3,000. Lets cover both.

The 6 Ants You’ll Actually See in Texas

Not every ant on your patio is the same problem. Most of the bad advice on the internet treats “ants” like one species. They aren’t. In Central Texas you will see these six, and each one wants something different from you.

1. Red Imported Fire Ants (Solenopsis invicta)

You know these. Reddish-brown, 1/8 to 1/4 inch long, build the loose dirt mounds in your yard that look like someone kicked a pile of coffee grounds. They sting, the sting burns, and if you have ever stood in a mound by mistake (I have, in flip-flops, mowing) you don’t forget it.

Texas A&M estimates a mature single mound holds roughly 100,000 to 250,000 ants. Hill Country pastures routinely run multiple mounds per acre. After spring rains you will see brand new mounds appear overnight, that’s mated queens from the flight cycle setting up shop.

2. Tawny Crazy Ants (Nylanderia fulva, formerly “Rasberry Crazy Ants”)

These are the problem ants of the next decade in Central Texas. Reddish-brown like fire ants but smaller, and they do NOT walk in tidy lines. They sprint in zig-zags, hence “crazy.”

First found in Texas near Houston in 2002 by a pest control operator named Tom Rasberry. The Urban and Structural Entomology Program at Texas A&M has confirmed populations in Travis, Hays, Williamson and Comal counties in Central Texas, with a documented heavy population in southwest Austin near Convict Hill Road and Highway 71 (Texas A&M Urban Entomology). Lago Vista and the Balcones Canyonlands area have them too.

Why they matter. They displace fire ants (good?), they short out electrical equipment (very bad), they don’t really respond to standard fire ant bait, and they form supercolonies that can hit hundreds of millions of ants in one neighborhood. If you have these, you need a pro.

3. Odorous House Ants (Tapinoma sessile)

The classic Texas “sugar ant.” Small (about 1/8 inch), dark brown or black, walks in lines along your baseboards and counter edges. If you crush one and smell it, it smells faintly like rotten coconut. That’s the “odorous” part, and yes, it’s a real ID test.

These are who’s on your counter at 6am the morning after you left an open jam jar out. After anything sweet, greasy or moist. Not dangerous, just annoying, and the species that the “spray them all” instinct makes dramatically worse.

4. Argentine Ants (Linepithema humile)

Small, brown, forms trails. Often called “sugar ants” by homeowners even though they are technically Argentine ants. Indoor treatment is the same as odorous house ants. Bait, don’t spray.

5. Carpenter Ants (Camponotus spp.)

The big ones. Black or reddish-black, half an inch long or larger. Carpenter ants don’t eat wood like termites do. They tunnel into already-damp, already-rotting wood to nest. If you have carpenter ants inside a wall, you have a moisture problem in that wall, and you have an ant problem on top of it.

If you see a few in the yard around a dead tree stump, no big deal. If you see a steady trail coming out of a baseboard, soffit or window frame, that’s when it stops being a DIY job.

6. Pharaoh Ants (Monomorium pharaonis)

Tiny, light yellow to amber, about 1/16 inch. You almost cannot see them. They are commonly reported as the most prevalent indoor ant in Texas, especially in apartments and hospitals.

Here is what makes them dangerous to mishandle. If you spray a pharaoh ant trail, the colony “buds.” Stressed pharaoh ant queens split off with workers and start a new sub-colony somewhere else in the house. Spraying turns one colony into five. This budding response is exactly why DIY pharaoh ant treatment usually fails. If you suspect pharaoh ants, do not spray. Call somebody.

The Single Biggest Mistake Texas Homeowners Make

Spraying.

You see a trail on the kitchen counter, grab the Raid, spray. Trail is dead. Two hundred ants on a paper towel. Feels like a win.

It isn’t. You killed the foraging workers. The queen, nesting in your wall void or under the slab, is still alive. In 3 to 7 days, the colony sends new foragers along a different route. With pharaoh ants especially, the colony has split into two or three smaller colonies in different parts of your house. Now you have a worse problem in three rooms.

The whole game with ants (except fire ants in the yard, which is different) is the queen. The only way to kill her is to let workers carry poison back to her. That’s what bait does. Bait is patient. Spray is not.

So the rule is, indoor trail ants get bait. Yard fire ants get the Two-Step. Carpenter, pharaoh and crazy ants get a phone call.

Fire Ants: The Texas Two-Step

This is the standard recommended by Texas A&M AgriLife Extension and it has not changed materially in 20 years because it works. Two steps, in order, with patience between them.

Step 1: Broadcast Bait (the whole yard)

Pick a dry day with no rain in the 24-hour forecast. In Texas summer, do this in the evening when temperatures drop into the 70s and 80s, because that’s when fire ants forage hardest. In spring and fall, anytime during the day is fine as long as it’s 70-90 degrees on the ground.

Use a hand spreader and walk the perimeter of your property, broadcasting at the rate on the bag (usually 1 to 1.5 pounds per acre). Light, even coverage. Do not dump piles.

The bait I recommend is Amdro Fire Ant Bait Granules. Active ingredient is hydramethylnon, a slow-acting metabolic poison. Workers carry it back to the mound, feed it to the queen and larvae, and the whole colony dies over 1 to 2 weeks. Hydramethylnon is also one of the lower-toxicity options for pets and pollinators when used as directed, which matters in Texas yards full of dogs and bees.

Then you wait. Do not retreat. Do not poke the mounds.

Step 2: Treat Individual Mounds (1 to 2 weeks later)

After about two weeks, you will see fewer active mounds. But some will remain, usually the bigger ones in places where bait did not get distributed. These you treat individually.

For high-traffic mounds (near a playset, back door, garden), use a mound drench. Mix a contact insecticide with bifenthrin (Talstar) per label directions and pour it directly down the top of the mound. About a gallon per mound. Hits the queen directly, kills within 24 hours.

For mounds on the back forty that aren’t bothering anybody, leave them. Honest answer, with five acres in the Hill Country, you aren’t eliminating every fire ant mound forever. You’re managing them. That’s the right mental model.

When to Re-Broadcast

Texas A&M Extension recommends broadcasting between late August and mid-October. The bait works through winter and you start spring with a smaller population. If you do one broadcast a year, do it in early fall. If you do two, add a spring round in April.

Indoor Trail Ants: Bait Stations, Not Spray

If you have a trail of small dark ants coming in around the dishwasher or under a window, this is sugar ants or odorous house ants 95% of the time. The treatment is dead simple.

Put down Terro T300 indoor liquid ant baits directly on the trail. Don’t break the trail. Don’t wipe it down. The trail is the ants telling each other where the food is, and you want them to bring the bait back home along that same highway.

The active ingredient is borax, suspended in a sweet liquid. Slow-acting, which is exactly what you want. Workers find it, drink it, walk it back to the queen, feed her. Over the next 3 to 7 days you’ll see MORE ants on the bait, not fewer. That’s good. That means the colony is taking it. Then the trail goes quiet and stays quiet.

Put stations at every entry point you can find. Ants enter under siding gaps, around plumbing penetrations, around windows. If after 14 days the trail is still active, you either picked the wrong bait flavor (some colonies want protein-based, in which case grease baits work better), or you have pharaoh ants and the colony is budding. Stop and reassess.

Crazy Ants and Pharaoh Ants: The Special Cases

Tawny crazy ants show up by the thousands, not in trails. The Texas A&M urban entomology team has been clear that consumer fire ant baits don’t work well on them. Different feeding patterns, and supercolonies don’t respond to single-mound treatment.

Professional products with fipronil (the active ingredient in Termidor SC) show effectiveness against tawny crazy ants, though the label is written for trained applicators and the correct rate and placement are not obvious to most homeowners. If you suspect crazy ants, especially in the documented invasion zones (southwest Austin, Lago Vista, Balcones Canyonlands), call a licensed pro. This is not a DIY job, and chasing it yourself will burn a season.

Pharaoh ants get the same call. The budding response makes amateur treatment counterproductive. If you are seeing tiny amber ants in a kitchen or bathroom, do not spray, and budget a service call.

Perimeter Barrier: The Quarterly Strategy

Once you’ve killed the colonies near the house, the next job is keeping the next wave out. Unlike spraying trail ants indoors, perimeter spraying actually works because you’re not breaking up an established colony. You’re creating a deterrent zone before they get in.

The consumer product my pest guy says works fine is Ortho Home Defense with Comfort Wand. Active ingredients are bifenthrin (0.05%) and zeta-cypermethrin (0.0125%), the same pyrethroid chemistry pros use, just at a lower concentration. The Comfort Wand is the reason I recommend that specific SKU. Doing a perimeter with a trigger spray bottle takes 45 minutes and your hand will hate you. With the wand, the whole house takes about 15 minutes.

Where to spray:

An 18-inch band along the bottom of the foundation, going all the way around the house
Up the foundation about 12 inches
Around all doors and windows at ground level
Around the garage door, especially the corners
Around AC condensers, hose bibs, and any outdoor plumbing penetration

Timing matters in Texas. Don’t apply right before a hard rain, bifenthrin is rain-fast about 6 hours after application. Reapply every 90 days, the same cadence professional pest control runs.

If you want to add an outdoor bait component (smart in fire ant country), Terro T1812 outdoor liquid ant bait stakes go in the ground around the perimeter and target sugar-feeding ants that haven’t made it inside yet. Not a replacement for Amdro on fire ants, an add-on for sugar ant pressure.

Septic and Pollinators

For rural Hill Country properties on septic, don’t broadcast or spray within about 25 feet of the drain field. The lateral lines have a fragile bacterial colony of their own and you don’t want pesticide leaching down to them. Treat individual mounds in that zone by hand instead. And on bees, bifenthrin and hydramethylnon are both rough on pollinators if applied while plants are in bloom. If your lantana or Salvia greggii is flowering, spray in the late evening when bees aren’t foraging, and avoid spraying directly on flowering plants. The product label has specific pollinator language. Read it.

Texas-Specific Timing: The Calendar That Actually Matters

Most generic ant articles tell you to “treat in spring.” Texas has different rules.

February through April. Fire ant mounds start visibly rebuilding. A spring broadcast in late March or April hits colonies before the May flight cycle.

May through June. After the first big spring rain (in Austin usually late April through May), you get massive fire ant flight cycles. Mated queens fly off, land somewhere on your yard, and start new colonies. Single largest population pulse of the year. Treat 2 to 4 weeks after, not during.

July through August. Heat drives sugar ants indoors looking for moisture. Bait, do not spray.

Late August through October. The Texas A&M Extension prime broadcast window. Cool enough that workers forage hard, dry enough that bait doesn’t wash off, and the bait has all winter to work down the colony.

November through January. Quiet. Mounds go dormant on the surface but the colony is alive underground. Don’t broadcast in cold weather, the ants aren’t foraging and the bait sits unused until it degrades.

When to Call a Pro (Real Thresholds, Not Cop-Outs)

Here is when you stop fighting it yourself and pick up the phone:

Carpenter ants inside a wall. You see a steady trail coming out of a baseboard or window frame. This usually means moisture damage in the framing behind it. You need an inspection, not a can of spray.
Five or more active fire ant mounds, recurring after treatment. Means you are sitting on a supercolony or your neighbors are, and you need professional broadcast equipment and continuous treatment.
Suspected pharaoh ants. Tiny amber ants indoors, multiple locations. Spraying makes this worse. Period.
Suspected tawny crazy ants. Hundreds or thousands of fast-moving small reddish ants in zig-zag patterns, especially in the southwest Austin / Lago Vista zone.
You don’t know what you are looking at. Bring a few ants to a pro in a sealed sandwich bag and have them ID. The wrong treatment costs more than the ID call.
You are about to sell the house. Buyers see ants in an inspection and it kills deals. A pro service in the 30 days before listing is cheap insurance.

In the Austin / Lakeway / Dripping Springs market, expect $150 to $400 for an initial pest service with inspection, treatment and ID, and $75 to $125 per quarterly treatment after that. A one-shot fire ant broadcast on a typical suburban yard runs $125 to $200. For an acre-plus Hill Country lot, $250 to $500 per broadcast. These are 2026 prices in my market.

One word of caution. The cheapest quote is usually somebody applying repellent spray to your foundation and calling it pest control. That works for spiders and roaches. It does not work for ants. Ask specifically what they’re using for ants. If the answer is “we spray the perimeter,” that’s incomplete. They should be baiting, ID-ing the species, and treating accordingly.

Ants Are a Maintenance Item, Not a Crisis

Ants are like AC filters or gutter cleaning. You don’t fix them once and forget. You manage them on a schedule. The houses without ant problems are the ones where the owner does a quarterly perimeter, a fall broadcast, and bait stations the second a trail shows up.

If you’re buying a home in the Hill Country, ask the seller what their pest treatment cadence has been. If they have records of quarterly service, you’re inheriting a low-ant property. If they say “I just spray when I see one,” budget for a full reset in your first season. For the broader picture, our Complete Guide to Home Maintenance in Central Texas walks through the full annual rhythm, and the Complete Guide to Pest Control in Central Texas covers wasps, roaches, scorpions and the rest of the Texas cast.

Frequently Asked Questions

Why are ants invading my Austin house all of a sudden?

Usually it’s weather. Heat drives sugar ants and odorous house ants indoors looking for moisture, and spring rains push fire ants to relocate and produce new mated queens. Most Austin homes see indoor trail ants in July and August. It’s not your housekeeping, it’s the calendar.

What kills fire ants the fastest in Texas?

For a single mound you need fast, a bifenthrin (Talstar) drench will kill within 24 hours. For an entire yard, you need the Texas A&M Two-Step: broadcast a hydramethylnon bait like Amdro, then drench remaining mounds 1 to 2 weeks later. Speed and total elimination are different goals and need different products.

Why do ants keep coming back after I treat them?

Almost always because you killed the workers but not the queen. Spray kills the foraging workers you can see, but the queen keeps producing replacements. Use bait products instead, the workers carry the slow-acting poison back to the queen and the colony dies at the source. If trails come back within 7 to 14 days, you sprayed when you should have baited.

Are fire ant mounds dangerous to my kids or dogs?

Fire ant stings cause painful welts in most people and rare but real anaphylactic reactions in some. For dogs, a single sting is usually fine, but a dog standing on or digging into a mound can take dozens of stings and that’s a vet visit. Treat any fire ant mound within about 20 feet of a play area, dog run, or garden bed immediately. Mounds in the back acres of a Hill Country property are less urgent.

What’s the difference between fire ants and tawny crazy ants?

Fire ants are about 1/4 inch, reddish-brown, walk in tidy lines, build visible dirt mounds, and sting. Tawny crazy ants are smaller (about 1/8 inch), the same reddish color, do NOT build mounds, do NOT walk in lines (they zig-zag erratically), and don’t sting but invade in massive numbers and short out electrical equipment. The treatments are completely different. Fire ants respond to standard bait, crazy ants don’t and require a professional with restricted-use products.

The Bottom Line

The fast version. Identify what you actually have before you treat. Bait indoor trail ants, never spray them. Use the Two-Step on fire ants, broadcast in late August through October. Quarterly perimeter spray with bifenthrin keeps the next wave out. Call a pro for carpenter, pharaoh, or crazy ants, and for any infestation you can’t ID. Skip generic “ant killer” sprays for anything walking around inside your house.

If you are buying or selling a home in West Austin, Lakeway, Bee Cave or Dripping Springs and want to know what to look for during inspection (ants and otherwise), reach out. I have walked enough Hill Country properties to know which questions to ask the seller and what’s normal versus what’s a problem.

Be safe, and be nice to the bees out there.

I Asked My Pest Guy: How to Get Rid of Ants in Texas Homes