Best Ant Killer for Mounds: Baits, Dusts and Drench Treatments

The best ant killer for mounds is Amdro Fire Ant Killer for Mounds, a bait that workers carry to the queen. Spectracide One-Shot is a second bait option, while Ortho Mound Treatment1, BioAdvanced dust and Ortho Mound Blitz kill a mound within a day or two by contact. Amdro's perimeter bait covers pavement and other non-fire ant hills.

How Mound Treatments Work

An ant mound is the visible top of a nest that can run deep into the soil, with the queen and brood well below the surface. Kicking the mound open or pouring something on top kills the ants near the surface, and the colony often moves a few feet away and builds a new mound. A good mound treatment either reaches the queen or soaks through the whole nest.

There are two ways to do that. Baits are food granules with a slow-acting insecticide; foraging workers carry them underground and feed them to the colony, including the queen. Contact treatments, sold as dusts, granules you water in or ready-to-pour packs, kill the ants they touch as they move through the treated nest.

Most mound products on the shelf target fire ants, the stinging ants that build loose, fluffy mounds in sunny lawns. For a wider view of yard products, from perimeter granules to sprays, see our guide to the best outdoor ant killers.

Baits vs Contact Mound Treatments

The Texas A&M fire ant program's two-step method uses both kinds in order. Step one spreads bait over the treatment area so workers carry it to every colony, including mounds you have not found; step two treats only the mounds near a mailbox, path or play area with a contact product. With only a few mounds, it says you can skip straight to treating each one.

Speed is the trade-off. The same program says baits with indoxacarb, spinosad or hydramethylnon take about 2 to 4 weeks to show results, while contact products applied to a mound typically kill the colony in 1 to 2 days. Baits cover the whole yard; contact treatments only the mound in front of you.

UC IPM guidance on managing ants around the home adds a caution for contact products: pyrethroids washed off hard surfaces pollute waterways, so keep dusts and granules on soil, not on driveways and patios. The outdoor and fire ant killers section links our guides to large-area and indoor-outdoor products.

How We Selected These Products

We looked for products sold to treat ant mounds and checked what each label says about the ants it lists, how you apply it and how fast it works. We kept two baits that reach the colony, three contact treatments in different forms (granules you water in, a dust and pre-measured packs) and one broad-spectrum bait for ants that are not fire ants. Our sources were the makers' listings, Amazon's review digests and guidance from Texas A&M and UC IPM; we did not test the products.

We passed over listings with few ratings and no review data, and one whose ingredient list contradicted itself, because a mound treatment is a pesticide you should be able to identify. Broadcast lawn products for big yards belong to a separate guide and are not covered here.

Baits come first, because they are the only option that reaches the queen in mounds you cannot see, starting with Amdro's mound bait.

Amdro Fire Ant Killer for Mounds: Best Overall

Amdro's mound bait is the pick for most yards with fire ant mounds. It is a bait, so it reaches the queen in the mounds you treat and in nearby colonies whose workers find it.

• A 2-pound container of hydramethylnon bait granules listed for imported and native fire ants, Argentine ants, bigheaded ants and harvester ants.
• You sprinkle it around each mound; workers carry it in as food for the colony and the queen.
• The maker says to expect fewer ants within one week; full results from hydramethylnon baits take about 2 to 4 weeks, per the fire ant program above.
• Apply in early morning or late afternoon, when ants forage, and not on wet ground or before heavy rain.
• Buyers find it highly effective and say fire ants are drawn to it.

Choose it for fire ant mounds scattered across a lawn when you can wait a week or two. Leave the mound alone after treating it, since disturbing it sends workers to rebuild instead of feeding.

OUR CHOICE

Amdro Fire Ant Killer for Mounds 2 lb

BaitHydramethylnonFire ants

Best for: Fire ant mounds across a lawn

• ✓Workers carry it to the queen, per the maker
• ✓Fewer ants within a week, per the maker
• ✓Buyers say fire ants are drawn to it
• −Must go on dry ground before rain-free weather
• −Full results take weeks, per Texas A&M

Editor's Note

It reaches the queen in mounds you treat and colonies you have not found. Sprinkle it around mounds when ants forage and leave them undisturbed.

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Specifications (2)

Active Ingredients

Hydramethylnon

Item Form

Powder

Spectracide One-Shot Fire Ant Killer: Best Bait for No-Water Mound Treatment

Spectracide One-Shot is a granular fire ant bait in a shaker canister. It is a second bait to consider when you want measured, quick application around individual mounds.

• A 1.5-pound canister; the maker says to sprinkle 4 tablespoons, about four shakes, around each mound.
• No watering is needed, and the label allows mound or broadcast use on lawns.
• The maker says one application controls fire ants for up to 3 months and kills the queen and colony in as little as 48 hours.
• The maker warns you will see more ants at first, and asks you not to water or mow for 24 hours.
• Buyers find it effective, especially in sandy spots such as driveway edges, but some call it pricey.

Choose it when you prefer to measure bait mound by mound with a canister rather than estimating handfuls. The listing does not name the active ingredient, so check the label in the store if that matters to you.

Spectracide One-Shot Fire Ant Killer 1.5 lb

BaitNo wateringFire ants

Best for: Measured bait with no watering

• ✓Controls fire ants up to 3 months, per the maker
• ✓No watering needed
• ✓Buyers report success in sandy spots
• −Active ingredient not named in the listing
• −Some buyers find it pricey

Editor's Note

Four shakes around each mound make dosing simple. Do not water or mow for a day after applying.

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Specifications (1)

Item Form

Granules

Ortho Fire Ant Killer Mound Treatment1: Best Budget Contact Treatment

Ortho's Mound Treatment1 is a granular contact product you water in. It is the budget way to kill a mound near a path or play area quickly.

• A 3-pound bag of granules for fire ants on residential lawns, ornamentals and flower gardens.
• The label calls for 2/3 cup over each mound and the surrounding 3-foot circle, then 2 gallons of water to drench it in.
• The maker says it kills mounds in 15 minutes and works best between 65 and 80°F.
• Keep people and pets off until the granules are watered in and the area has dried; it is not for vegetables.
• Buyers find it effective and easy to apply, though several describe a strong, unpleasant smell.

Choose it for a mound by the mailbox, swing set or front walk that needs to go today. Do not water to the point of runoff, and keep granules off the driveway.

BUDGET PICK

Ortho Fire Ant Killer Mound Treatment1 3 lb

DrenchNeeds waterFire ants

Best for: A budget drench for a mound near a path

• ✓Kills mounds in 15 minutes, per the maker
• ✓Easy to apply, per buyers
• ✓Labeled for lawns and flower gardens
• −Needs 2 gallons of water per mound
• −Strong odor, per buyers

Editor's Note

Use it on mounds where people walk or play. Keep people and pets off until it is watered in and dry.

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Specifications (2)

Item Form

Granules

Item Weight

3 pounds

BioAdvanced Fire Ant Killer Dust: Best Dust for Many Mounds

BioAdvanced's dust is the contact option for yards with lots of small mounds. You shake it straight over each mound with no water.

• A 1-pound bottle that the maker says treats up to 130 mounds.
• It is listed for fire ants, pavement ants and red harvester ants, and kills on contact.
• The label allows use around lawns, flower beds, ground covers, trees and shrubs.
• Buyers report whole colonies dead within a day and say a couple of teaspoons per mound is enough.
• Some buyers find the powder scatters easily from the shaker.

Choose it for many mounds you want gone fast, especially where hauling water to each mound is a chore. Apply on a calm day so the dust lands on the mound rather than the breeze.

BioAdvanced Fire Ant Killer Dust 1 lb

DustUp to 130 moundsFire ants

Best for: Many mounds treated fast

• ✓Treats up to 130 mounds, per the maker
• ✓Colonies dead within a day, per buyers
• ✓Low odor
• −Powder can scatter from the shaker
• −Contact only; misses unseen colonies

Editor's Note

It suits yards with many small mounds. Apply on a calm day so the dust lands on the mound.

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Specifications (1)

Item Form

Powder

Ortho Fire Ant Mound Blitz: Best No-Measure Treatment

Ortho's Mound Blitz takes the measuring out of mound treatment. Each pre-measured pack treats one mound.

• A bag holds 8 pre-measured packs; you open one and pour it over a mound.
• No mixing, measuring or watering in is needed, according to the maker.
• It is labeled for home lawns and around flowers, shrubs and trees.
• Buyers find it effective and good value, with one reporting a mound gone overnight; some note a bad smell.

Choose it when you have a handful of mounds and want a simple, mess-free routine. It gets expensive for a yard with dozens of mounds, where a dust or bait is better value.

Ortho Fire Ant Mound Blitz 8 Packs

8 pre-measured packsFire ants

Best for: A few mounds with no measuring

• ✓No mixing, measuring or watering, per the maker
• ✓Effective on mounds, per buyers
• ✓Good value, per buyers
• −Eight packs treat only eight mounds
• −Bad smell, per buyers

Editor's Note

It is the simplest treatment for a handful of mounds. For dozens of mounds, a dust or bait is better value.

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Specifications (2)

Unit Count

1.68 Ounce

Specification Met

Fire Ant

Amdro Ant Killer for Outdoor Home Perimeter: Best for Non-Fire Ant Hills

Not every mound is a fire ant mound. Small hills of fine soil along sidewalks and patio edges usually belong to pavement ants or other nuisance ants, and Amdro's perimeter bait lists them.

• A 24-ounce shaker of hydramethylnon bait granules listed for 25 ant species, including pavement, Argentine, odorous house and carpenter ants.
• You shake it around the hills and in a band along the foundation.
• The maker says it keeps working for up to 3 months, with fewer ants within a week.
• Do not apply it to wet ground, before rain within 24 hours or below 50°F.
• Buyers find it easy to spread and effective, though some find it overpriced or smaller than expected.

Choose it for little ant hills along walks, driveways and the house that keep sending ants inside. It does not list fire ants, so use a fire ant product for stinging ants.

Amdro Ant Killer for Outdoor Home Perimeter 24 oz

Bait25 ant speciesNot for fire ants

Best for: Pavement and other non-fire ant hills

• ✓Bait reaches the colony, per the maker
• ✓Lists 25 ant species
• ✓Buyers find it easy to spread
• −Must go on dry ground with no rain for 24 hours
• −Does not list fire ants

Editor's Note

It handles the small hills along walks and the house that send ants inside. Use a fire ant product for stinging ants.

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Specifications (2)

Active Ingredients

Hydramethylnon

Item Form

Granules

The right pick depends on the ant, the number of mounds and how quickly they must go.

How to Choose an Ant Killer for Mounds

• Fire ant mounds spread across the lawn: start with Amdro's mound bait or Spectracide One-Shot and give it a few weeks.
• A fire ant mound where people walk or play: Ortho Mound Treatment1, BioAdvanced dust or Mound Blitz for a kill within a day or two.
• Dozens of small mounds: BioAdvanced dust for value, or a bait if you can wait.
• Small hills along sidewalks and the house: Amdro's perimeter bait for pavement and other nuisance ants.
• Mounds near a vegetable garden: check the label; several contact products are not for use on vegetables.

Texas A&M also notes that fire ant products kill native ants, which compete with fire ants, so treat only where the pest ants are. Retreat a mound only after the product has had its full time to work.

Common Questions About Ant Killers for Mounds

Which One Should You Buy?

For most fire ant yards, Amdro Fire Ant Killer for Mounds is the one to buy. Spending a few weeks on a bait pays off because it ends colonies you would otherwise keep chasing one mound at a time, and a dry, sealed container lasts through the season.

If you would rather dose by the shake, Spectracide One-Shot is the other bait. When a mound sits where people walk, use a contact product: Ortho Mound Treatment1 on a budget, BioAdvanced dust when there are many mounds, or Mound Blitz for a few with no measuring. For small hills of pavement ants along walks and the house, Amdro's perimeter bait is the fit.

Before buying, walk the yard on a warm morning and count the mounds near paths and play areas, since those are the ones that need a contact product.