Ever notice how ant trails seem to appear from nowhere during a summer downpour, yet in winter they become phantom kitchen invaders? You’re not imagining it. Ant behaviour in sub-tropical and temperate climates like Brisbane and Sydney is driven by two key factors: temperature and moisture. Understanding this seasonal shift is the key to effective, long-term control.
Winter Behaviour: The Slow Retreat (June – August)
In winter, ants don’t hibernate, but their metabolism slows dramatically. They become less adventurous, conserving energy by sticking to reliable food sources. This is why you often find them indoors.
- Concentrated Activity: Foraging runs are shorter. Trails often lead from wall voids to warm spots like behind the fridge, near the dishwasher, or along hot water pipes.
- Diet Shift: With fewer natural food sources outside, they rely on your kitchen for fats, proteins, and sugars. This makes kitchen hygiene absolutely critical.
- Best Approach: Slower activity makes winter an excellent time for targeted baiting. Ants are more likely to take bait back to the nest, leading to colony elimination. Sealing entry points around plumbing is also highly effective.
Summer Surges: The Great Expansion (December – February)
Summer heat supercharges ant colonies. Their lifecycle accelerates, populations boom, and foraging becomes aggressive and widespread. This is when infestations can seem to explode overnight.
- Explosive Trails: Warmth and humidity allow pheromone trails to last longer, guiding hundreds of workers to any food source found by a scout.
- Storm-Driven Invasion: Heavy summer rain in Brisbane and Sydney floods outdoor nests, forcing entire colonies to seek high ground—often inside your home via weep holes and cracks.
- Best Approach: Focus on the exterior. A professional perimeter barrier spray is crucial to stop them from getting inside. Managing moisture around your home by clearing gutters and fixing leaks is also key.
At a Glance: Winter vs. Summer Ant Control
| Factor | Winter Strategy | Summer Strategy |
|---|---|---|
| Primary Goal | Target the nest with indoor baiting. | Create an exterior barrier to prevent entry. |
| Key Mistake to Avoid | Spraying indoor trails (kills scouts, not the colony). | Ignoring outdoor nests and moisture issues. |
| Most Effective Tool | Professional-grade gel baits. | Residual perimeter sprays. |
The Verdict: Year-Round Vigilance is Key
Effective ant control isn't a one-off event; it's about adapting your strategy to the season. While DIY prevention helps, persistent trails indicate a well-established colony that requires professional intervention. A season-aware treatment plan is the only way to achieve long-term relief.