Ants are the number one nuisance for many Santa Clarita households, and Argentine ants are the main culprit. These small, light-to-dark brown ants form supercolonies with multiple queens and no meaningful boundaries between nests. A single yard can host thousands of workers marching along fences, pipes and block walls. When the weather turns dry or very wet, they come inside.
Species in the valley
- Argentine ants trail in long, steady lines and nest in soil, mulch and under pavers. They are drawn to sweet foods and honeydew.
- Odorous house ants smell like rotten coconut when crushed and nest in wall voids.
- Pavement ants nest beneath slabs and walkways, often showing up in garages.
- Southern fire ants have been reported in Southern California, so painful stings in the yard warrant a proper identification.
- Carpenter ants are less common than in wetter climates but turn up in wood affected by leaks or in old trees.
- Harvester ants live on open slopes and vacant lots near the hills and may wander into yards.
The Santa Clarita factor
Ants follow water. During hot, dry summers and when Santa Ana winds dry the hillsides, colonies migrate toward irrigated lawns and indoor kitchens. In winter and spring, heavy rains flood nests and drive them indoors for shelter. HOA landscaping in Valencia and Stevenson Ranch uses drip irrigation and mulch beds that provide perfect nest sites, and ornamental plants like hibiscus, citrus and roses host aphids and scale, which produce honeydew that ants harvest. Stucco cracks, weep screed gaps and the seams of garage doors give easy entry. Because Argentine ants form supercolonies, sprays that kill the visible workers do little to the broader colony.
Indications of trouble
- A steady stream of ants on a kitchen counter or along baseboards.
- Ants gathering around pet bowls, fruit or spills.
- Clusters of aphids or scale on garden plants, with ants tending them.
- Winged ants emerging after rain.
Professional strategy
Experienced ant technicians avoid repellent sprays when dealing with supercolonies. Instead, they use non-repellent barrier treatments and slow-acting baits that workers carry back to the nest, spreading through the colony. Bait choice matters: it must match what the ants want that season, whether sugar, protein or oil. Outdoors, technicians treat along foundations, fence lines and ant highways. They may recommend controlling honeydew insects on plants, cutting back vegetation that touches the house, and adjusting irrigation so water does not pool at the wall.
Do-it-yourself habits that help
- Wipe counters daily and store sweets in sealed containers.
- Rinse recycling and keep pet bowls clean.
- Prune plants away from the house and eliminate ivy against walls.
- Adjust sprinklers to avoid soaking the foundation.
- Seal visible cracks in the stucco, around windows and where pipes enter.
Help in Santa Clarita
If ants keep returning, call (844) 725-1661. PestMinistry is a referral service that connects Santa Clarita residents with independent, licensed pest control providers; we do not do the treatments ourselves.
Why does spraying make the ants worse?
Repellents can cause supercolonies to split and spread into new areas.
Do ants damage plants?
They protect insects that feed on plants, which can lead to damage.
Are ants active in winter in Southern California?
Yes, especially after rain, when they come indoors for shelter.
How long does professional treatment take to work?
Baits typically show results over a few days to a couple of weeks.