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Red Imported Fire Ant (Solenopsis invicta)
Identify it, prevent it, and know when to call. A South Florida guide from Pro-Spray.
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What Is a Fire Ant?
The red imported fire ant arrived in the United States from South America in the early 1900s and is now common across Florida. It's the ant most people mean when they talk about "fire ants," and it earned that name from the burning sting it delivers. Colonies are aggressive and defend their mounds in large numbers.
How to Identify Them
Workers range in size within the same colony, from small to medium, and are reddish-brown with a darker abdomen. The mound is the giveaway: a loose, fluffy dome of soil, often with no visible entrance hole on top, usually in an open, sunny area. Disturb it and ants pour out immediately and climb upward to sting.
Common look-alikes:
- Big-headed ant: leaves scattered soil along pavers rather than domed mounds, and doesn't sting.
- Native fire ants: less common in developed areas; treatment is similar.
Life Cycle and Habits
Colonies may have one queen or many. Mature colonies send out winged reproductives, often after rain, to start new colonies. Workers forage for insects, seeds, honeydew and proteins. Tunnels extend well beyond the mound, so workers may pop up far from the visible dome. During floods, fire ants can link together into floating rafts and survive the high water.
Signs of an Infestation
- Fluffy, dome-shaped mounds in lawns, garden beds and along pavement edges
- New mounds appearing after rainy days
- Stings while gardening, mowing or playing in the yard
- Ants inside A/C units, electrical boxes and pool equipment
- Ants nesting in potted plants
Is it dangerous?
- Stings
- Allergens
Painful stings that often form white pustules; allergic reactions in sensitive people; risk to pets and young children.
Why They Show Up in South Florida Homes
Sunny lawns, irrigated landscaping and rainy summers suit fire ants well. Yards that back up to canals, fields or open lots often see more pressure. They're attracted to electrical fields and sometimes pack into A/C condensers and utility boxes.
Safety Tips
- Teach kids to recognize and avoid mounds.
- Wear shoes and gloves when gardening.
- If stung, wash the area and avoid breaking pustules. Seek medical care immediately for swelling of the face or throat, trouble breathing or dizziness.
- Keep pets away from mounds and check their bedding areas outdoors.
Prevention Tips
- Watch for new mounds, especially after rain.
- Don't just kick or flood a mound; the colony usually moves nearby.
- Keep yard debris and woodpiles off the lawn.
- Check potted plants and new sod for mounds.
How Pro-Spray Treats Fire Ants
We treat active mounds next to your home, patio, walkways and doors, where fire ants are most likely to sting your family and pets. Perimeter treatments help keep them from moving toward the home. Quarterly service lets us catch new mounds before they become a problem.
Fire Ants and Pool Areas
Pool decks, paver edges and the soil around pool equipment are common fire ant spots. Colonies can build under pavers and around pump pads, where kids and guests walk barefoot. Check these areas regularly, especially after storms.
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Frequently Asked Questions
Why do fire ant stings turn into white bumps?
Are fire ants dangerous to pets?
Why do new mounds appear after rain?
Does pouring hot water on a mound work?
Reviewed October 2026 by Pro-Spray's family-run team
Pests don't wait.
Protect your home today.
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