Quick answer
The most effective way to control fire ants in a lawn is the two-step method. First, broadcast a bait over the whole yard. Our pick is Advion Fire Ant Bait, which works in 24–72 hours. Second, treat any mound that’s a problem right now with a fast mound killer such as Ortho Orthene. For whole-lawn protection that stops new mounds for months, use Ortho Orthene Broadcast Granules (up to 6 months).
Red imported fire ants build fluffy mounds with no central opening, sting aggressively, and relocate when you disturb a mound. Drenching one mound often just moves the colony. Baits that worker ants carry to the queen, combined with fast mound treatments where you need them, give the most reliable control.
| 1 |  | Advion Fire Ant BaitBest Overall Bait | Check price |
| 2 |  | Ortho Orthene Fire Ant Killer Broadcast GranulesBest Long-Lasting Protection | Check price |
| 3 |  | Ortho Orthene Fire Ant Killer (Mound Dust)Fastest Mound Treatment | Check price |
| 4 |  | Amdro Fire Ant Killer for LawnsBest Budget Bait | Check price |
| 5 |  | Spectracide Fire Ant Shield Yard Protection GranulesBest Multi-Pest Option | Check price |
| 6 |  | Extinguish Plus Fire Ant BaitBest Dual-Action Bait | Check price |
The best fire ant killers for lawns
1Advion Fire Ant BaitBest Overall Bait
Advion uses indoxacarb, which ants activate after eating it. Syngenta lists control of imported fire ants in 24–72 hours, fast for a bait. You can broadcast it across the lawn or sprinkle it around individual mounds.
- Type: granular bait
- Active ingredient: indoxacarb
- Speed: 24–72 hours (manufacturer)
- Use: broadcast or mound
Best For: Step one of the two-step method on most lawns.
Pros:
- Fast for a bait
- Low application rate
- Reaches hidden colonies
Cons:
- Higher price per bag
- Must stay dry
- Needs a hand spreader
2Ortho Orthene Fire Ant Killer Broadcast GranulesBest Long-Lasting Protection
Spread over the whole lawn and watered in, these granules prevent new mounds for up to 6 months and control re-infestation from neighboring yards. Apply with a broadcast spreader.
- Type: broadcast granules
- Protection: up to 6 months (manufacturer)
- Size: 13 lb
- Apply: spreader, then water in
Best For: Lawns with repeat fire ant problems or infested neighbors.
Pros:
- Long protection
- Prevents new mounds
- Treats the whole lawn
Cons:
- Not a bait, so it doesn’t target the queen directly
- Must be watered in
- Keep kids and pets off until it’s dry
3Ortho Orthene Fire Ant Killer (Mound Dust)Fastest Mound Treatment
Sprinkle it over a mound with no watering needed. Ortho says it starts killing in about 60 minutes, including the queen. One 14 oz bottle treats up to 189 mounds.
- Type: mound dust
- Active ingredient: acephate
- Speed: begins in about 60 minutes
- Coverage: up to 189 mounds per 14 oz
Best For: Mounds near play areas, paths and patios.
Pros:
- Very fast
- No watering
- Treats many mounds
Cons:
- Strong odor
- Only treats visible mounds
- Keep kids and pets away
4Amdro Fire Ant Killer for LawnsBest Budget Bait
Amdro’s broadcast bait pairs a fire ant bait with an insect growth regulator for up to 3 months of control. It’s cheaper per square foot than Advion, though slower.
- Type: bait with insect growth regulator
- Control: up to 3 months
- Size: 5 lb
Best For: Large lawns on a budget.
Pros:
- Low cost per treatment
- Prevents new mounds
- Easy to find
Cons:
- Slower than Advion
- Must stay dry
- Goes stale once opened
5Spectracide Fire Ant Shield Yard Protection GranulesBest Multi-Pest Option
Spectracide’s granules kill existing mounds, prevent new ones for up to 3 months, and also control crickets, chinch bugs, armyworms, grubs, fleas and ticks.
- Type: yard protection granules
- Control: up to 3 months (fire ants)
- Also kills: chinch bugs, armyworms, grubs, fleas, ticks and more
- Size: 10 lb
Best For: Lawns with fire ants plus other lawn insects.
Pros:
- Broad insect control
- Season-long
- Affordable
Cons:
- Not a bait
- Broad insecticides affect beneficial insects
- Keep off blooming plants
6Extinguish Plus Fire Ant BaitBest Dual-Action Bait
Extinguish Plus combines hydramethylnon, a fast-acting bait toxicant, with (S)-methoprene, an insect growth regulator that stops colonies reproducing. It’s labeled for residential turf, and for pasture use without grazing restrictions.
- Type: dual-action bait
- Active ingredients: hydramethylnon + (S)-methoprene
- Size: 1.5 lb
Best For: Long-term colony suppression, including near grazing animals.
Pros:
- Kills and sterilizes colonies
- Labeled for pastures
- Broadcast or mound
Cons:
- Slower to clear existing mounds
- Small bag
- Limited stock
The two-step method
- Broadcast a bait (Advion, Amdro or Extinguish Plus) over the whole lawn when ants are foraging and the grass is dry. Test by dropping a chip. If ants find it within 30 minutes, it’s a good time to bait.
- A few days later, treat problem mounds with a fast mound killer such as Orthene, especially near play areas.
- Repeat the broadcast bait once or twice a year, typically spring and fall.
This approach, promoted by Texas A&M AgriLife Extension, uses less insecticide than treating every mound and catches young colonies that haven’t built visible mounds yet.
Frequently asked questions
What kills fire ants permanently?
Nothing is permanent, because new queens fly in from nearby. Twice-yearly broadcast baiting gives the longest-lasting control.
Should I disturb the mound before treating?
No. Disturbing the mound makes the colony relocate. Apply baits around the mound, and sprinkle mound treatments evenly on top, following the label.
Are fire ant killers safe for pets?
Used as labeled, most allow pets back once the product is dry or watered in. Store products out of reach, and keep pets away while baits are on the ground.
Related: Best yard ant killers
How we chose: This is a researched guide. We compared active ingredients, bait vs contact action, speed, protection length and coverage from product labels and listings, plus Texas A&M AgriLife fire ant guidance. We didn’t field-test these products. Always follow the label.
Update log: November 2026: rebuilt the guide. We organized the picks around the two-step method, removed non-fire-ant products, and added timing, safety and an FAQ.