How to Prevent Ants and Ant Mounds in Your Lawn: A Comprehensive Guide

Many of us take pride in maintaining a vibrant lawn. However, ants and ant hills can disrupt our landscape, leading to patchy grass, unsightly mounds, and potential damage to plants and roots. By taking proactive steps to prevent ant infestations, you can protect the integrity of your lawn and preserve its lush green beauty for years to come.

Types of Ants Commonly Found in Lawns

  • Fire ants (Solenopsis spp.): Recognized by their reddish-brown color and aggressive nature, fire ants are notorious for their painful stings and large mound nests. They thrive in warm climates and can pose a significant threat to humans and pets.
    fire ants
  • Argentine ants (Linepithema humile): These invasive ants are characterized by their uniform brown color and extensive colonies. Argentine ants are adept at forming supercolonies, making them challenging to control once established in an area.
    Argentine ants
  • Odorous House Ants (Tapinoma sessile): Named for the unpleasant odor they emit when crushed, odorous house ants are common household pests. They prefer sweet foods and are often found trailing along kitchen countertops and pantry shelves.
    Odorous House Ants
  • Pavement ants (Tetramorium spp.): Typically found nesting under sidewalks, driveways, and pavement cracks, pavement ants are small, dark-colored ants that feed on various foods, including grease and protein.
    Pavement ants

Ant Behavior and Nesting Habits

Ants are social insects that live in colonies and exhibit complex behaviors geared towards survival and reproduction. Understanding their behavior and nesting habits is essential for effectively preventing ant infestations in your lawn.

  • Foraging behavior: Ants are opportunistic foragers that search for food, water, and shelter in their surroundings. They communicate with one another through chemical signals, known as pheromones, to coordinate foraging activities and locate food sources.
  • Nesting sites: Ants build nests in various locations, including soil, leaf litter, mulch, and decaying wood. Depending on the species, ant colonies may establish shallow nests just beneath the soil's surface or construct elaborate mound nests above ground.
  • Reproductive cycle: Ant colonies consist of a queen, workers, and sometimes winged reproductive individuals known as alates. The queen is responsible for laying eggs, while worker ants perform tasks such as foraging, nest maintenance, and caring for the brood.

Flying Ants

flying ants

Flying ants are reproductive members of ant colonies. They typically appear in large numbers during the mating season, which varies depending on the ant species and environmental conditions. These reproductive ants, also known as alates, have wings and are responsible for mating and establishing new colonies.

When environmental conditions are favorable, typically during warm, humid weather, winged male and female ants emerge from the colony in a synchronized mating flight. During the mating flight, male and female flying ants from different colonies congregate in the air, where they mate. After mating, the males die, while the fertilized females shed their wings and seek suitable locations to establish new colonies.Flying ants are typically a temporary phenomenon, lasting anywhere from a few hours to a few days, depending on environmental conditions. 

Identifying Signs of Ant Infestation in Your Lawn

Identifying Signs of Ant Infestation
  • Visible ant trails: Look for trails of ants moving to and from a food source. These trails are often most visible during early morning or late afternoon when ants are most active.
  • Mound nests: Keep an eye out for raised mounds of soil or debris, which indicate the presence of an ant colony. Mound nests can vary in size and shape depending on the ant species.
  • Damage to plants: Ants may damage plants by feeding on sap, honeydew produced by aphids, or plant material. Examine plants for signs of wilting, yellowing leaves, or stunted growth, which could indicate ant activity.

Understanding ant behavior and nesting habits is the first step towards implementing effective prevention strategies to keep your lawn free from ant infestations and unsightly ant hills. 

Impact of Ants and Ant Hills on Lawn Health

Ants are more than just a nuisance; they can wreak havoc on your lawn's ecosystem. Tunneling through the soil in search of food and nesting sites, ants can disturb the delicate balance of nutrients and microorganisms essential for healthy plant growth. 

  • Grass damage: Ants can disrupt grass growth by excavating soil and creating unsightly mounds. This can smother grass and inhibit root development, resulting in patchy, uneven areas in the lawn that detract from its aesthetic appeal.
  • Plant health: Ants may also damage plants by feeding on roots, foliage, or sap. Certain ant species have symbiotic relationships with plant pests, such as aphids, which produce the honeydew ants feed on, potentially leading to secondary pest infestations and further plant damage.
  • Safety hazards: Some ants, such as fire ants, pose a threat to human and pet safety with their painful stings. Accidentally disturbing a fire ant mound while working in the yard can result in multiple stings and potential allergic reactions.

Tips for Preventing Ants and Ant Hills

Preventing ants and ant hills in your lawn requires a combination of proactive measures and diligent maintenance practices. By following these tips, homeowners can create an environment that discourages ants from taking up residence in their outdoor space.

Proper Lawn Maintenance Practices

  • Regular mowing: Keep your lawn mowed to an appropriate height to discourage ant activity. Shorter grass reduces shelter and nesting sites for ants, making your lawn less attractive to them.
  • Proper watering: Water your lawn deeply and infrequently to encourage deep root growth and discourage ants, which prefer moist environments. Avoid overwatering, as soggy soil can attract ants seeking moisture.
  • Address potential nesting sites: Remove potential nesting sites such as piles of organic debris, leaf litter, and stacked firewood from your lawn to discourage ants from establishing colonies.
  • Aeration: Periodically core aerate your lawn to improve soil drainage and reduce compaction, which can make conditions less favorable for ants to establish nests.
  • Soil amendments and pH balancers: Conduct a soil test and improve soil health and structure by incorporating organic matter such as compost or biostimulants. Healthy, nutrient-rich soil supports strong root growth and discourages pests like ants. 

Related: Soil Test Kit Results Back: What Next? 

Natural Deterrents

  • Ant-repelling plants: Plant aromatic herbs and flowers such as mint, lavender, marigolds, and tansy around the perimeter of your lawn to repel ants with their strong scents.
  • Physical barriers: To deter ants from entering your lawn, create barriers using diatomaceous earth, cinnamon powder, or crushed eggshells. These substances create abrasive surfaces that ants avoid crossing.

Chemical Solutions

  • Selective pesticides: Choose targeted insecticides labeled for ant control, such as those containing bifenthrin or fipronil. Apply pesticides according to label instructions and avoid broadcasting over the entire lawn to minimize environmental impact.

One of the best outdoor ant killers is Caravan® G, a pesticide designed for broad-spectrum control of various pests, including ants. But it’s not just insects that it combats; It contains two active ingredients, azoxystrobin and thiamethoxam, to control lawn-damaging fungi, too. 

Caravan® G is a great all-in-one product that works best when applied between May and July. It can also be applied to warm and cool-season grasses. To control ants in your lawn, it is best to apply the pesticide when you first observe ant mounds. Just one teaspoon is all you need to place around the mound, then water it in to move the active ingredients to the target area.

Caravan® G will work to control most ants, except fire ants, carpenter ants, harvester ants, and pharaoh ants.


  • Eco-friendly options: Consider eco-friendly ant control products formulated with botanical oils or microbial insecticides, which pose minimal risk to non-target organisms and the environment.

Mirimichi Green Pest Control — Non-Toxic Pest Control is an excellent organic and non-toxic pesticide. It is crafted from organic, natural ingredients, ensuring safety for the environment and those nearby. 

Unlike some conventional pesticides, it's not a neurotoxin, making it safer for use around people, pets, and plants. With no temperature restrictions, you can use it whether the weather is hot or cold. Upon application, it swiftly eliminates pests and larvae on contact without allowing bugs to develop immunity. Once it dries, you can promptly re-enter the treated area, and even rainfall won't diminish its effectiveness. It also has a refreshing citrus scent, making the application more pleasant.


By implementing these preventive measures and staying vigilant in your lawn maintenance efforts, you can effectively deter ants and prevent the formation of unsightly ant hills in your outdoor space.

Related: Pest Control For Your Lawn | A Complete Guide

Integrated Pest Management (IPM) Approach

Integrated Pest Management (IPM) is a holistic approach to pest control that emphasizes prevention, monitoring, and using multiple strategies to manage pest populations effectively while minimizing environmental impact. Adopting an IPM approach can help homeowners address ant infestations in their lawns in a sustainable and environmentally friendly manner.

Implementing IPM Strategies for Ant Prevention

  • Cultural controls: Adopt cultural practices such as proper lawn maintenance, irrigation management, and soil amendment to create an environment less hospitable to ants.
  • Mechanical controls: Use physical barriers, such as mulch or diatomaceous earth, to deter ants from entering the lawn. Regularly remove debris and organic matter that provide nesting sites for ants.
  • Biological controls: Encourage natural predators of ants, such as birds, to inhabit your lawn by providing bird feeders, nesting boxes, and habitat diversity. Certain nematodes and microbial insecticides can also be used to target ant populations without harming beneficial organisms.
  • Chemical controls: Consider using targeted insecticides labeled for ant control. Apply pesticides judiciously and selectively, focusing on areas with high ant activity while minimizing exposure to non-target organisms.

Benefits of Adopting an IPM Approach

IPM promotes long-term, sustainable pest management by addressing underlying factors contributing to pest problems, such as poor lawn health or habitat conditions. By integrating multiple control tactics, homeowners can minimize the need for chemical pesticides, reducing the risk of environmental contamination and pesticide resistance.

While initial implementation of IPM may require investment in preventive measures and monitoring, long-term savings are achieved through reduced reliance on costly chemical treatments and repair of pest-related damage.

Related: Integrated Pest Management: A Sustainable and Holistic
Approach to Lawn Care

Be Persist-Ant

Remember, prevention is the best defense against ant infestations. By practicing good lawn maintenance habits, incorporating natural deterrents, and staying vigilant for signs of ant activity, homeowners can reduce the risk of ant problems before they escalate.

Ultimately, the goal is to create a welcoming outdoor space where you and your family can enjoy leisure activities without the nuisance of ants and unsightly ant hills. By taking proactive steps to protect your lawn against ant infestations, you can ensure your outdoor oasis remains a source of pride and enjoyment for years to come.

For more tips and resources on lawn care and pest management, be sure to visit our YouTube channel. Here's to a healthy, ant-free lawn!