Quick answer
The most effective approach is usually two steps: a broadcast bait across the lawn to reach colonies you can't see, followed by treating individual problem mounds.
Why Mounds Return
Disturbing or flooding a mound often just moves the colony a few feet away. Baits work because worker ants carry them back to the queen.
Two-Step Method
- Apply bait when ants are actively foraging, typically on warm, dry days
- Wait a few days, then treat any remaining active mounds with a labeled mound treatment
- Repeat in spring and fall
Mowing Safety
Mounds can damage mower blades and sting operators. Flag large mounds before mowing.