Sugar ants are attracted to sweet, carbohydrate-rich foods above almost everything else, but they also seek out protein sources and moisture. The term “sugar ant” in the U.S. usually refers to the odorous house ant, a tiny brown ant about 1/10 inch long that gives off a rotten coconut smell when crushed. Understanding exactly what draws them in helps you figure out why they showed up and how to get rid of them.
Sugars and Sweets Come First
Carbohydrates are the primary fuel for ant colonies, and sugar ants have a strong, consistent preference for them. Research from the University of California, Riverside found that a 25% sucrose water solution was the most preferred bait concentration across multiple studies. That’s roughly the sweetness of maple syrup diluted with water, which gives you a sense of how intensely these ants respond to sugar at moderate concentrations.
In your kitchen, this translates to fruit juice, soda, honey, jam, syrup, ripe fruit, and any sugary residue left on countertops or in recycling bins. Even a thin film of dried juice on a countertop is enough to attract a foraging scout, which then lays a chemical trail back to the colony. Adding salt to sugar sources actually enhances their feeding response, so salty-sweet snacks and condiments like ketchup or barbecue sauce are especially attractive.
Protein Matters More Than You’d Think
Sugar ants don’t live on sweets alone. Virginia Tech research on odorous house ants found they consistently preferred both sugar and protein over fats, with no seasonal shift in that preference. Protein-rich foods like meat scraps, cheese, eggs, pet food, and dead insects all draw them in. One research team even documented odorous house ants feeding on a dead vole in spring, likely because colonies need extra protein when queens ramp up egg production after winter.
Fats, on the other hand, were largely ignored in controlled tests and in some cases actually reduced feeding. So while a greasy stovetop might attract other pests, it’s the crumbs and spills with sugar or protein content that sugar ants zero in on.
Moisture Is a Major Draw
Water can be just as powerful an attractant as food. Ants need moisture to survive, and colonies often migrate indoors during very hot, dry weather or after heavy rain floods their outdoor nests. Inside your home, they gravitate toward leaky pipes, damp wood, condensation around windows, and the areas beneath sinks and around water heaters. Argentine ants, another species commonly called sugar ants, are frequently found near water pipes, sinks, and potted plants for exactly this reason.
Odorous house ants typically nest in wall voids around heaters, hot water pipes, and crevices near sinks and cupboards. If you’re seeing ants in your bathroom rather than your kitchen, moisture is likely the main attractant.
What Attracts Them Outdoors
Outside, sugar ants feed heavily on honeydew, a sticky, sugar-rich liquid produced by aphids, scale insects, mealybugs, and whiteflies as they feed on plant sap. Sugars make up over 98% of honeydew’s dry weight, and it also contains amino acids and water. Ants treat honeydew-producing insects like livestock, actively protecting them from predators in exchange for this reliable food source.
This relationship matters for your home because landscaping that harbors aphids or scale insects near your foundation is essentially baiting ants toward the building. Flower nectar, tree sap, and overripe fallen fruit serve as additional outdoor sugar sources that keep colonies thriving close to your walls.
Specific Household Hotspots
Certain areas and habits create the conditions sugar ants look for:
- Kitchen counters and floors: Spilled drinks, crumbs, sticky residue from cooking, and fruit bowls with ripening produce.
- Recycling bins: Unrinsed soda cans, juice containers, and food packaging retain enough sugar residue to attract scouts.
- Pet food bowls: Dry and wet pet food left out provides both protein and carbohydrates.
- Trash cans: Open or loosely sealed trash, especially near entry points.
- Drains: Organic buildup inside kitchen and bathroom drains creates a food and moisture source ants can access from inside walls.
- Pantries: Unsealed bags of sugar, flour, cereal, and other dry goods.
How to Remove What Attracts Them
Eliminating attractants is the most effective long-term strategy, more so than killing individual ants. Start with food access. Store all pantry ingredients in sealed containers. Clean up spills immediately, especially anything sugary. Use detergent when you clean, not just water, because detergent breaks down the pheromone trails ants leave behind. Rinse all recycling before it goes in the bin, and keep trash in sealed containers at least 50 feet from your home’s entrances if possible.
Address moisture next. Fix leaking pipes, ensure proper drainage that slopes away from your foundation, and reduce humidity in crawl spaces and basements. These steps remove the water source that sustains colonies nesting in or near your walls.
Outside, maintain a 2 to 3 foot vegetation-free zone around your building’s perimeter using gravel or concrete instead of wood mulch, which retains moisture and provides nesting habitat. Trim tree branches and shrubs so they don’t touch the building, since ants use these as bridges. Avoid planting species prone to aphid or scale insect infestations near your foundation.
Sealing Entry Points
Even with perfect sanitation, ants will explore indoors if they can get in. Seal cracks in walls and flooring, apply sealant around utility entrances and pipe junctions, and install door sweeps that maintain contact with the threshold with gaps no larger than 1/16 inch. Window and vent screens should be 20-mesh or smaller to physically exclude ants. Check cardboard boxes and wooden pallets brought into your home, since ants commonly hide in folds and corners of packaging materials.