How to Identify Fire Ants: A Complete Guide
Quick Facts About Fire Ants
Imported fire ants are aggressive, stinging ants that build mounds in sunny lawns, pastures, and roadsides. They’re established across much of southern and Middle Tennessee and continue to spread, and they’re a real hazard for children, pets, and livestock.- Size: About 1/8 to 1/4 inch, with workers of different sizes in the same mound
- Color: Reddish-brown to dark reddish-brown, with a darker abdomen
- Body: Two nodes at the waist and a stinger at the tip of the abdomen
- Mounds: Fluffy, dome-shaped mounds of loose soil with no opening on top
- Behavior: Swarm out and sting in large numbers when a mound is disturbed
- Species in Tennessee: Red imported fire ants, black imported fire ants, and hybrids of the two
How to Identify Fire Ants
The mound is usually the easiest clue.Fire Ant Mounds
- No top opening: Unlike most ant hills, fire ant mounds have no central hole; the ants enter through underground tunnels.
- Shape: Loose, crumbly domes from a few inches to more than a foot tall, often appearing after rain
- Location: Sunny, open areas such as lawns, pastures, playgrounds, and along driveways and sidewalks
The Ants
Workers vary in size within the same colony, and they pour out aggressively when the mound is disturbed. Most other ants run away; fire ants climb up and sting.
Fire Ant Stings
Each fire ant can sting repeatedly, so one disturbed mound can mean dozens of stings in seconds.- What happens: A burning pain, then a raised welt. Within about a day, many stings turn into small white pustules.
- What to do: Brush ants off quickly (they cling), wash the area with soap and water, and use a cold compress. Don’t pop the pustules, which can get infected.
- When it’s an emergency: Get emergency care right away for trouble breathing, swelling of the face or throat, dizziness, or a large number of stings, especially on a child.
Health & Property Risks
Beyond painful stings, fire ants threaten pets and livestock, damage lawns and garden plants, and can nest in electrical equipment such as AC units, transformers, and outdoor outlets, causing short circuits.
How to Control Fire Ants
- Treat the whole yard: Broadcast fire ant bait across the lawn so foragers carry it back to all colonies, including mounds you can’t see.
- Then treat problem mounds: Use a mound treatment on mounds near play areas, walkways, and doors.
- Time it right: Baits work best in warm, dry weather when ants are actively foraging. Rain washes bait out.
- Don’t disturb mounds first: Kicking or raking a mound makes the colony move and can scatter it.
Mound-by-mound treatment alone usually just moves the problem. For properties with repeated mounds or children and pets outside, professional treatment is safer and more effective. See our ant control services.
Preventing Fire Ants
- Treat early in spring, before colonies build up
- Check new sod, potted plants, and hay for mounds before bringing them onto your property
- Inspect play areas, pet runs, and garden beds regularly
- Keep outdoor electrical boxes sealed
Frequently Asked Questions
Are there fire ants in Tennessee?
Yes. Imported fire ants are established across much of southern and Middle Tennessee and continue to spread.
How do I know if a mound is a fire ant mound?
Fire ant mounds are loose, dome-shaped piles of soil with no opening on top, usually in sunny open areas. When disturbed, ants swarm out quickly and sting.
What should I do if I get stung by fire ants?
Brush the ants off, wash with soap and water, and use a cold compress. Don’t pop the white pustules. Seek emergency care for trouble breathing, facial swelling, dizziness, or many stings.
Does pouring something on the mound get rid of fire ants?
Usually not. The colony often just moves. Broadcasting bait across the yard, then treating individual mounds, works much better.
When is the best time to treat for fire ants?
Warm, dry weather when the ants are actively foraging, especially early in the season before colonies grow.
