Pest Guides

Red Imported Fire Ant

Solenopsis invicta


Image of Red Imported Fire Ant [Solenopsis invicta] | Ehrlich Pest Control
  • A small ant, with workers averaging 3-6 mm in length.
  • Soil mounds tend to be 46 cm or less in diameter
  • Red to brown body color


  • A mature colony can have nearly one-quarter million workers, while typical colonies have about one-third as many.


  • Mounds are accidentally disturbed and large numbers of irritated stinging red ants emerge to attack the source of the disturbance.
  • Low temperatures appear to be key to limiting northward expansion - they fail to become established in regions where the soil persists at near-freezing temperatures for more than a couple of weeks.

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