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Understanding Mosquito Season in the United States: A Regional Guide

June 17, 2026 · The Clime Team
Understanding Mosquito Season in the United States: A Regional Guide

Mosquitoes are more than just a nuisance; they can transmit diseases like West Nile virus, dengue, and Zika. Understanding when mosquito season begins and ends in your region is crucial for effective prevention.

When Does Mosquito Season Start and End?

In the United States, mosquito activity is primarily influenced by temperature and humidity. Generally, mosquitoes become active when temperatures consistently stay above about 60°F (15°C) and reach peak activity between 70°F and 80°F (21°C to 27°C). The season's duration varies across regions:

  • Southern and Southwestern States: Mosquitoes typically emerge in March and remain active through September or even into October. (thermacell.com)

  • Mid-Atlantic, Great Lakes, and Northern West: The season usually starts in April, with peak activity from June to August, and ends in September. (thermacell.com)

  • New England, Northern Midwest, and Pacific Northwest: Mosquitoes become active in May, peak in July and August, and the season concludes in September. (thermacell.com)

  • Gulf Coast, Florida, and Hawaii: These areas experience mosquito activity nearly year-round, with peak months from June to October. (thermacell.com)

Regional Variations and Climate Impact

Climate plays a significant role in mosquito activity. Warmer and more humid conditions extend the mosquito season, while cooler and drier climates shorten it. For instance, in Georgia, the mosquito season generally starts in March or April and ends around October. However, recent trends indicate an increase in mosquito days due to warmer and more humid conditions. (gpb.org)

Protecting Yourself from Mosquito Bites

To reduce the risk of mosquito-borne diseases, consider the following measures:

  • Use EPA-Registered Insect Repellents: Products containing DEET, picaridin, or oil of lemon eucalyptus are effective. (cdc.gov)

  • Eliminate Standing Water: Mosquitoes breed in stagnant water. Regularly empty containers like birdbaths, gutters, and planters.

  • Install Screens: Ensure windows and doors have tight-fitting screens to keep mosquitoes out.

  • Wear Protective Clothing: When possible, wear long-sleeved shirts and long pants to minimize exposed skin.

Conclusion

Mosquito season varies across the United States, influenced by regional climates and temperatures. By understanding the timing and taking appropriate precautions, you can effectively protect yourself from mosquito-borne illnesses.

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