Ants keep returning because they follow persistent pheromones trails to readily available food, water, and shelter (like crumbs, spills, leaks, or cracks). Even if you kill the visible ants, the original scent trail often remains, and new scout ants from the larger colony will find and reinforce it, drawing more ants back to the same spot unless the nest and all entry points are completely addressed, say experts from Bug Out Service.
How to prevent ants in your home
Sugar, Crumbs, and Uncovered Food
Ants send scavengers all around your home to try to find some sign of food. When they do, they go back to their nest, send a message to other workers, and suddenly swarms of these ants will come into your house to pick up food for the rest of their colony.
Some ants, like odorous house ants, are attracted to sweet foods, while others are drawn to greasy or protein-based foods. If there is a continuous source of food, ants will keep coming back, searching for crumbs, pet food, or even food residues. Solution: Eliminating food sources is key to keeping ants away.
You may not know it from the number you see in your home, but ants generally reside outdoors. That means that when you see a trail of ants leading to your kitchen garbage can, they came in from some kind of crack or crevice, and the likely culprits are your windows.
You shouldn't squish ants indoors because it releases alarm pheromones that attract more ants to the spot, worsening the problem, and some ants release formic acid that smells like vinegar and can irritate skin. Crushing them doesn't eliminate the colony and can even disrupt their trails, causing them to spread out, so it's better to use baits or natural deterrents to handle the source, according to pest experts.
To deal with ants that have made it inside, try to identify the type of ants that may be entering your home, then make sure to eliminate their food sources, vacuum up their trails, seal any gaps in your home where they may be getting in, lay down bait, and keep your home clean.
Signs of an ant infestation
Ants hate strong, pungent smells that disrupt their pheromone trails, especially citrus (lemon, orange), vinegar, peppermint, tea tree oil, cinnamon, coffee grounds, and garlic, which can be used as natural repellents by applying them at entry points or as sprays. Other scents like lavender, cayenne pepper, and eucalyptus also deter them by overwhelming their senses, making it hard for them to navigate or communicate.
#1 humans. Humans are the biggest threat to ants. Some communities in Southeast Asia and South America eat ants or their larvae. However, deforestation, pesticide use, urban expansion, and climate change pose significant threats to ant habitats, endangering many species.
Simply killing the ants you see won't solve the problem—they'll keep coming back unless you target the source.
What time of year are ants most active? Ant activity varies by species, but ants can thrive year-round. However, March to October are generally the most active months of the year for ants.
Ants leave scent trails to find their way and guide other ants, so killing one ant won't necessarily stop others from following, but it will impede the progress of their exploitation into your home.
To get rid of ants permanently, combine sanitation, sealing entry points, and baiting/killing methods to eliminate the colony and prevent their return, focusing on eliminating food sources (crumbs, spills, pet food), blocking access with caulk or diatomaceous earth, and using baits like borax/sugar/water or store-bought traps to have ants carry poison back to the nest. Natural deterrents like vinegar or mint can disrupt trails, while long-term prevention involves landscaping and reducing moisture.
To get rid of ants fast, use bait traps (borax/sugar or baking soda/sugar) to eliminate the colony, spray visible ants with dish soap/water to kill on contact, and disrupt trails with vinegar; for mounds, pour boiling water directly into them, while creating barriers with chalk or diatomaceous earth blocks entry points for long-term control.
Chalk. A common home remedy for ants is to use a piece of chalk to draw a border around the common entry points for ants. It is thought that this works as ants won't cross the chalk line, wanting to preserve the scent trail.
Ants. Ants can be a real nuisance when they invade your home, so it makes sense that some homeowners have tried placing dryer sheets near ant trails or entry points to deter them. While the strong scent of dryer sheets might confuse ants and temporarily disrupt their trail, it's not a long-term solution.
You'll often see them moving to, from, and around the nest, so watching their movement and following their trails is a good way to find the source of ants. Ants that nest in the ground leave small piles of excavated soil just outside of nest entrances. These excavation piles often have a small “volcano” appearance.
Chemical signals
Pheromones can be used in many ways. The queen will use pheromones to let her workers know when she is nearing the end of her life or when the colony should split (which is called budding). Workers can warn other workers of a threat or an alternate nesting site. Those chemicals are very useful.
How do you tell if ants are in your walls? Signs of ants in walls include rustling sounds, small piles of dirt or wood shavings, and ants entering and exiting through tiny gaps. If you notice trails leading toward walls or frequent activity around electrical outlets and baseboards, you may have an ant colony inside.
A vinegar solution is a simple and effective home remedy to kill ants. Mix equal parts of water and white vinegar in a spray bottle and apply it to ant trails, entry points, and nests. The strong smell of vinegar disrupts the ants' scent trails and deters them from returning.
However, in the field, it is common to find ant species that inhabit nests showing multiple entrances. This is the case for natural nests of the red ant Myrmica rubra, that can show from one to six nest entrances being separated by a few centimetres up to a few decimetres (M. Lehue 2018, personal field observations).
Where do ants enter into your home? Cracks and Seams - The indiscernible cracks, gaps, and seams in your walls, windows, doors, vents, and foundation may be large enough to invite ants into your home as they search for food, moisture, and warmth.