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An Introduction to Mosquito Season Outlooks for Pet Owners

June 18, 2026 · The Clime Team
An Introduction to Mosquito Season Outlooks for Pet Owners

As summer approaches, pet owners across the United States should be vigilant about the upcoming mosquito season. Mosquitoes are not only a nuisance but also vectors for diseases that can affect both humans and animals.

When Does Mosquito Season Begin?

Mosquito activity is primarily influenced by temperature. In most regions, mosquitoes become active when temperatures consistently stay above 60°F (15°C). The season typically spans from March through October, with peak activity between 70°F and 80°F (21°C to 27°C). However, the exact timing varies by region:

  • Southern and Inland Southwest States: Mosquitoes emerge in March and remain active through September or October.

  • Northern Regions (e.g., New England, Upper Midwest, Pacific Northwest): The season runs from May through September.

  • Southern Florida and Gulf Coast: Mosquitoes can be active nearly year-round due to consistently warm temperatures. (biologyinsights.com)

Regional Variations in 2026

The 2026 mosquito season has shown some early activity:

  • Southern California: Unseasonably warm temperatures in January accelerated mosquito life cycles, leading to increased activity earlier than usual. (latimes.com)

  • Colorado: Reports of mosquitoes began as early as March, likely due to a mild winter and early spring warmth. (cpr.org)

Risks to Pets

Mosquitoes are known to transmit heartworm disease, a serious and potentially fatal condition in dogs. The Companion Animal Parasite Council (CAPC) forecasts an expansion of heartworm risk in 2026, with increased prevalence in areas previously considered low or moderate risk. (capcvet.org)

Preventive Measures

To protect your pets during mosquito season:

  • Eliminate Standing Water: Mosquitoes breed in stagnant water. Regularly remove water from containers, birdbaths, and gutters.

  • Use Pet-Safe Repellents: Consult your veterinarian for safe mosquito repellents suitable for your pet.

  • Regular Veterinary Check-ups: Ensure your pet is on a heartworm prevention regimen as recommended by your veterinarian.

  • Limit Outdoor Exposure: During peak mosquito activity times, typically dawn and dusk, keep your pets indoors.

Conclusion

Understanding the timing and risks associated with the 2026 mosquito season is essential for pet owners. By staying informed and implementing preventive measures, you can help safeguard your pets from mosquito-borne diseases.

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