When to Schedule Pest Control by Season (2026)

A professional perimeter spray creates a residual insecticide barrier around your home's foundation, entry points, and eave line. This prevents ants, spiders, earwigs, centipedes, and other crawling insects from entering as they become active in warming weather. Spring perimeter treatments are the single most cost-effective pest control service — they prevent problems before they start. Schedule in March or early April, before nighttime temperatures consistently exceed 50°F.

Termite swarm season peaks from March through May in most of the U.S. (earlier in southern states). Swarming termites are the most visible sign of an active colony, but subterranean termites can cause damage for years without visible swarmers. An annual termite inspection costs $75–$150 (often free if you're considering treatment) and can catch infestations before they cause thousands in structural damage. This is especially important if you live in a high-termite-pressure area (Southeast, Gulf Coast, Southern California).

Begin mosquito barrier treatments when nighttime temperatures consistently reach 50°F — the threshold for mosquito breeding activity. In most areas, this means starting in April or May. Treatments every 21 days throughout the season keep mosquito populations suppressed. Starting early prevents population buildup that's harder to control mid-summer.

If you're on a quarterly plan, your summer treatment (typically June or July) refreshes the perimeter barrier from spring. This is the most critical re-treatment — summer heat and rain degrade spring applications, and pest pressure is at its highest. If you skipped the spring treatment and are now seeing ants, spiders, or other pests inside, a summer treatment can still establish control, but expect 2–3 weeks before the population drops noticeably.

By mid-summer, paper wasp nests that started as a few cells in April can hold 50–200 workers. Yellow jacket colonies can reach 1,000–5,000 workers by August. Removing nests in June when they're still small ($100–$200) is safer and less expensive than dealing with a mature colony in August ($200–$400). Check eaves, soffits, sheds, and yard areas weekly and address new nests promptly.

Fall perimeter treatments serve a different purpose than spring — they target the migration of pests seeking winter shelter. Ask your provider to focus on foundation-level entry points, garage door seals, utility penetrations, and window frames. This treatment catches spiders, stink bugs, box elder bugs, crickets, and other fall invaders before they establish inside wall voids where they'll overwinter.

Mice and rats move indoors when outdoor temperatures drop below 50°F consistently — typically October or November depending on region. Professional rodent exclusion (sealing all entry points) costs $200–$800 but prevents infestations that cost $500–$1,500+ to resolve once rodents are established inside. Schedule exclusion work in September or early October, before the migration starts. Look for gaps around pipes, foundation cracks, garage door gaps, and soffit openings.

If rodents made it inside before fall exclusion (or if no exclusion was done), winter is when you'll notice them most — scratching sounds at night, droppings in cabinets or along baseboards, gnaw marks on food packaging. Don't wait until spring to address rodent problems. Mice reproduce every 3 weeks with litters of 5–7 pups. A pair of mice in November can become 50+ by March. Professional trapping and exclusion costs $300–$700 and is just as effective in winter.

Most pest control companies offer early-bird pricing (10–20% off) for spring services booked in January or February. Seasonal programs for mosquitoes, ticks, and general pest control fill up quickly in high-demand markets. Booking in winter also lets you schedule your preferred day and time slot before the spring rush.