10/08/2026
Fall colors are moving in, but mosquitoes and ticks haven’t checked out yet
Cooler temperatures, changing leaves, pumpkin patches, and scenic hikes are some of the best parts of fall. As more people head outdoors to enjoy the season, the Louisville Metro Department of Public Health and Wellness (LMPHW) is reminding everyone that mosquitoes and ticks are still active and can pose a health risk even in autumn.
Many people assume mosquitoes disappear as soon as the weather cools down, but that's not the case, said Connie Mendel director and chief health strategist at the Louisville Metro Department of Public Health and Wellness.
“Mosquitoes can remain active until the first significant frost, although some can endure longer,” Mendel said. “Generally, they disappear or enter a dormant state when temperatures consistently drop below 50 degrees.”
Louisville's recent warm weather may result in increased mosquito activity. Generally, mosquitoes require temperatures around 50 degrees or lower for several weeks to initiate their winter cycle, which typically occurs in November. With daytime temperatures staying in the 70s and 80s and more individuals engaging in outdoor activities, the chances of encountering mosquitoes rise, Mendel said.
“Although mosquito populations are starting to decrease, there are still mosquitoes that carry West Nile virus and are active," she said. "We are observing a reduction in overall mosquito numbers, but those carrying West Nile virus remain present and continue to bite.”
Don't forget about ticksFall is also prime time for hiking, camping, and enjoying Kentucky's colorful landscapes. However, fallen leaves and increased ground cover provide excellent hiding places for ticks.
Whether you're exploring local parks, taking a weekend road trip, or enjoying a hike to see the changing colors, it's important to check yourself, children, and pets for ticks when returning indoors. Residents are encouraged to submit ticks for testing when appropriate.
Personal protection during the fall is just as important as it is during the summer months. Our video also explains how we monitor ticks and their populations.
Protect yourself this fall
LMPHW continues to monitor mosquito populations using trap surveillance and addressing community concerns throughout the season. But here are ways you can reduce your risk of mosquito bites and tick encounters:
• Use EPA-registered insect repellents containing DEET, picaridin, IR3535, or oil of lemon eucalyptus.
• Wear long sleeves, long pants, and socks when spending time outdoors.
• Perform tick checks after hiking, yard work, or other outdoor activities.
• Eliminate standing water around your home by checking flowerpots, gutters, birdbaths, pet dishes, pool covers, and discarded tires.
• Winterize swimming pools and keep gutters clean.
• Install or repair window and door screens to keep mosquitoes outside.
• Report mosquito concerns to Metro311 by dialing 311 or 502-574-5000.
Mosquito prevention resources
• Learn more about mosquito fogging by watching this video.
• Watch this video to learn how to reduce mosquito breeding sites around your home.
• To check if your area will be fogged, visit the department’s website or call the mosquito fogging hotline, 502-574-6641.
• To make a complaint about mosquitos in your neighborhood call Metro311 by dialing 311 or 502-574-5000.
