Pest Biology & Outbreaks
Noticing an unusual surge in spiders around your home? Discover why mild winters, high humidity, and insect hatches trigger severe Ontario spider spikes.
Spider populations spike due to three primary factors: mild Ontario winters that allow higher egg sac survival, warm humid summers that create huge midge and insect hatches (food abundance), and unsealed siding that offers prime overwintering harborage.
Spiders produce egg sacs in late autumn that overwinter in sheltered soffits and bark cracks. When winters have fewer prolonged deep freezes, a much higher percentage of spiderlings hatch in May.
Additionally, wet spring weather produces dense populations of flies, midges, and mosquitoes along Southern Ontario lakes and rivers, providing the caloric fuel for rapid spider maturation.
Mild temperatures protect fragile egg sacs from freezing, leading to exponential spring populations.
High moisture leads to massive aquatic midge and mosquito swarms that feed developing spiders.
Cooler August/September nights trigger outdoor spiders to move toward warm residential brick and siding.
Left unchecked, an untreated property becomes a multi-generation breeding ground. A single female orb weaver or sac spider can lay 200–400 eggs. A professional bi-annual barrier treatment breaks this reproductive chain completely.
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