The pest control industry's busiest months are June through August — when infestations are at their peak and homeowners are in crisis mode. But the smartest time to start pest control is before you need it. Treating early, when populations are small and emerging, costs less, uses fewer chemicals, and delivers better results than fighting an established infestation.
Here's the optimal timing for every major pest category, based on their biology and seasonal patterns. For your specific region, check our Pest Season Calendar.
For most pests, early spring is the best time to begin. Here's why: overwintering insects are emerging with depleted energy reserves and small populations. Ant colonies are restarting foraging. Termite swarm season begins. Mosquito larvae are just hatching in standing water. Treating now intercepts pests before they reproduce.
Ants: Spring colonies send out first foragers. Perimeter treatment and bait placement now prevents kitchen invasions in May–June.
Termites: Swarm season begins March–May depending on region. Schedule your annual termite inspection before swarms begin.
Mosquitoes: Eliminate standing water and place Bti dunks in permanent water features before the first generation completes its life cycle.
Ticks: Nymphs become active in April. Apply yard treatment before peak activity. Start using permethrin-treated clothing for outdoor activities.
The second critical timing window addresses fall invaders — pests that enter structures to overwinter. Miss this window and you'll have stink bugs, Asian lady beetles, cluster flies, and mice inside your walls all winter with no effective way to remove them.
August: Seal all exterior gaps and cracks. Apply perimeter spray around foundation and window frames. This must be done before pests begin seeking shelter. Our September checklist covers every step.
September: Set rodent traps and monitoring stations in the garage, basement, and attic. Mice begin entering homes as nighttime temperatures drop below 50°F.
Quarterly pest control plans (4 visits per year) typically align treatments with seasonal pest pressure: spring startup, summer peak, fall prevention, and winter monitoring. For homes with recurring pest pressure, this schedule makes biological sense — you're treating before each major pest wave rather than reacting after.
That said, quarterly plans aren't necessary for every home. If your house is well-sealed, has no moisture issues, and is located away from heavy pest pressure (woods, water, agricultural land), you may only need targeted annual treatments. Our cost guide breaks down what quarterly plans should cost and what they should include.