Blog · Updated 2026-10-23
How to Get Rid of Fire Ants in the House
A line of tiny red ants by the back door is bad enough. Fire ants in the bathroom or across the kitchen counter are worse, because these ants sting. Here is how to stop them.
Quick answer
Fire ants inside almost always come from a colony outside. Wipe up the trail, use an ant bait labeled for indoor use where they travel and seal the cracks they use. Then treat the yard with the Texas A&M Two Step Method: broadcast bait, then treat problem mounds. Killing only the ants you see won't stop them.
First, Make Sure They Are Fire Ants
Many small ants come inside. Fire ants are reddish brown, and the workers in one colony come in mixed sizes. Outside, they build mounds of loose, fluffy soil in sunny spots. Texas A&M's fire ant project says the clearest sign is the sting: it burns, and a white pustule forms a day or so later. No other ant in Texas causes that.
If you aren't sure what you have, see our fire ant guide or ask your technician. Other indoor ants need a different bait.
Why Fire Ants Come Inside
Fire ants live in the soil, but weather can push them indoors:
- Hot, dry spells. In the long Odessa summer, ants hunt for water. Kitchens, bathrooms and AC drip lines draw them in.
- Heavy rain. When a storm soaks the ground, colonies move up and out. Fresh mounds against the foundation are common after a hard rain.
- Food. Pet food, grease and sweet spills bring scouts in. Once they find food, a trail follows.
They get in through cracks in the slab, gaps around pipes, wall outlets, window frames and weep holes. Mounds right against the house are a red flag.
How to Get Rid of Fire Ants in the House
- Protect your family first
Keep kids and pets away from the trail. Brush ants off skin fast, since an ant removed before it stings can't inject venom.
- Wipe the trail
Clean up spills and wipe the trail with soapy water to remove the scent they follow. Keep snacks and kibble in containers with tight lids.
- Use the right bait inside
Place an ant bait labeled for indoor use near the trail, out of reach of kids and pets. Workers carry bait back to the colony. Read and follow the label every time.
- Find the colony outside
Follow the trail outside. Look for mounds along the foundation, under slabs, beside walkways and in flower beds.
- Treat the yard with the Two Step Method
Texas A&M AgriLife recommends broadcasting fire ant bait over the whole yard, then treating problem mounds near doors, walkways and play areas. Per AgriLife, this approach is slow, often weeks to months, yet it reaches 80 to 90 percent control.
- Seal the gaps
Caulk cracks around windows, pipes and the base of walls. Seal gaps where the slab meets the wall.
Timing Tips for West Texas
Bait works best when the ground is dry and no rain is expected for a day or two. AgriLife names late August to mid October as a great time to broadcast. In summer, fire ants forage in the cooler evening hours, so put bait out then. In the heat of the day, ants stay deep underground and ignore it.
New mounds popping up after a May or August storm are a good reminder to bait again. The colonies were there the whole time. Rain just made them visible.
What Not to Do
- Don't rely on spray alone. Spraying the trail kills the ants you see but not the queen, who keeps laying eggs.
- Don't spray right over bait. Insecticide on or near bait can kill workers before they carry it home.
- Don't pour boiling water on mounds by the house. AgriLife says it kills the colony only about 60 percent of the time, and it can burn you and your lawn.
- Don't disturb a mound right before baiting. Ants need to be out foraging to take the bait.
When a Sting Needs Care
Most stings burn, itch and form a pustule that heals in a few weeks. Don't pop it. Wash with soap and water and use a cold pack. Chest pain, nausea, heavy sweating, trouble breathing, serious swelling or slurred speech after a sting call for emergency care right away.
When to Call a Technician
Get help if fire ants keep coming back, if you see them in bedrooms or near a baby, or if mounds are pushing up through slab cracks. Your technician will bait inside, treat the yard on the right schedule and find the cracks they use. See ant control for the full plan or general pest control for routine service. Living in a rural spot like Gardendale? Ask about larger yard treatment.
Fire Ants Indoors Questions
Why are fire ants in my bathroom?
Bathrooms are damp, and fire ants look for water during hot, dry weather. They often come in through gaps around pipes under the sink, tub or toilet. Seal around those pipes, fix leaks and treat the colony outside where the trail starts.
Can fire ants nest inside my house?
They usually nest in the soil, but colonies can build under slabs, in wall voids near moisture or in potted plants. Ants that seem to come from inside a wall often have a colony under the slab or right outside. Following the trail helps find it.
Is fire ant bait safe around my pets?
Follow the label. Keep pets out of treated areas until the label says it is fine, and use indoor baits in spots pets can't reach. Bait is used at low rates across the yard. Ask your technician which product they plan to use and how long to wait.
How long does it take to get rid of fire ants?
Bait is slow but thorough. AgriLife says baits can take weeks to months to give full results. Mound treatments near doors work faster. Using both, along with sealing cracks into the house, gives the best lasting result.
Same Day Service Available
Get Help With Fire Ants Indoors
Fire ants marching through the kitchen? Request a free inspection. Your technician will find the colony and stop the trail at its source.
Odessa Pest Control connects you with a local pest control technician. Ask for their Texas license number before work starts.
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Sources
- Texas A&M AgriLife Extension, Fire Ant Two Step Method: https://fireant.tamu.edu/controlmethods/twostep/
- Texas A&M Imported Fire Ant Project, Medical Information: https://fireant.tamu.edu/manage/medical-information/
- Texas A&M Imported Fire Ant Project, How Can I Tell If I Have Fire Ants: https://fireant.tamu.edu/manage/how-can-i-tell-if-i-have-fire-ants/