Mosquitoes Follow the Seasons — So Should Your Defense

Mosquito activity is strongly tied to temperature and rainfall. Understanding the seasonal patterns in your region lets you act before populations peak, making control easier and more effective. This guide walks through what to do in each season to stay protected all year.

Spring: Get Ahead Before They Hatch

Spring is your most important window for proactive action. As temperatures rise above 10°C (50°F), overwintering mosquito eggs begin to hatch and dormant females become active again.

Spring Action Checklist

  • Inspect your property: Walk the yard after snow melt and winter rains. Clear any debris — leaves, fallen branches, old containers — that collected water over winter.
  • Clean gutters: Winter leaf buildup creates ideal moist breeding conditions. Clear gutters before spring rains arrive.
  • Check and repair window and door screens before you need to open them.
  • Apply Bti dunks to ponds, rain barrels, and any water features you can't drain.
  • Stock up on repellents: Don't wait until mosquitoes are already biting to buy supplies.

Summer: Peak Season Protection

Summer brings the highest mosquito populations. Warm temperatures shorten the development time from egg to adult (sometimes under a week), and more people are outdoors. This is the season to be most vigilant.

Daily and Weekly Summer Habits

  • Empty any container holding water at least once a week — even small amounts can support a breeding cycle.
  • Apply EPA-registered repellent when spending time outdoors, especially at dawn and dusk when many species are most active.
  • Wear loose, light-colored, long-sleeved clothing when possible — mosquitoes are attracted to dark colors and can bite through tight fabrics.
  • Use fans on patios and decks — mosquitoes are weak fliers and struggle against air currents.
  • Install or repair outdoor lighting that attracts fewer insects (warm-toned LEDs rather than bright white or UV lights).
  • Consider permethrin-treated clothing for high-exposure activities like camping or hiking.

Protecting Children in Summer

Ensure children playing outdoors use age-appropriate repellents and wear protective clothing during peak biting hours. Apply repellent for them — don't allow young children to apply it themselves. Avoid repellents containing OLE or oil of lemon eucalyptus on children under 3 years of age.

Autumn: Clean Up to Cut Down Next Year's Population

Autumn cleanup directly impacts the following spring's mosquito population. Many species overwinter as eggs laid in autumn — reducing these now means fewer mosquitoes next season.

  • Clear fallen leaves from gutters, yard, and garden beds.
  • Remove or properly store any containers that could hold water through winter.
  • Drain and cover water features if not in use.
  • Cut back tall grass and dense vegetation where adult mosquitoes rest during the day.

Winter: What Actually Happens to Mosquitoes?

Mosquitoes don't simply disappear in winter — they survive in various ways depending on the species:

  • Egg dormancy: Some species (Aedes) lay cold-hardy eggs in autumn that hatch the following spring.
  • Adult dormancy: Some female Culex mosquitoes overwinter as adults in sheltered locations — sheds, basements, or hollow logs — becoming active again in spring.
  • Larval survival: In mild climates, larvae may persist in water that doesn't fully freeze.

In warmer climates, mosquito activity may continue at reduced levels year-round.

Year-Round Mindset

The most effective mosquito management isn't reactive — it's a consistent, season-by-season approach. A few hours of preparation in spring and autumn can significantly reduce the mosquito pressure you face in summer. Combined with smart daily habits during peak season, this approach protects your family with minimal reliance on chemical treatments.