Is Mosquito Season Getting Longer?
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Mosquito season isn’t as predictable as it used to be. In Raleigh, NC, Dr. Michael Reiskind’s lab has documented mosquito activity as early as February and as late as December. Asking “When is mosquito season?” means looking less at the calendar and more at the temperature.
Key Takeaways
- Mosquito season is driven by temperature, not specific months.
- Warm, wet weather creates ideal breeding conditions for mosquitoes.
- The Southeast has the longest mosquito season in the U.S.
- Warmer average temperatures may be extending mosquito seasons.
What Determines When Mosquito Season Starts and Ends
Mosquitoes are ectothermic, meaning they rely on outside temperatures to regulate their bodies. If it’s warm enough for them to fly, feed, and reproduce, they’re active. Temperatures dropping below specific levels lead to slowed or stopped activity.
Rain plays a role, too. Standing water creates breeding habitats. About two weeks after a heavy rainfall, adult mosquito numbers often increase.
Mosquito season begins when temperatures consistently support activity and ends after sustained cold.
Mosquito Season Across the United States
Mosquito season varies by region; however, mid-summer to late summer is typically the peak season in many places.
In the Southeast, the warm and humid conditions support mosquitoes during most of the year. The Midwest and Great Plains often see strong but shorter seasonal peaks, especially after rain or flooding.
The West’s drier climates often mean fewer mosquitoes, but irrigation and localized water sources can change that. One exception? Alaska and the Arctic. Despite chilly temperatures, these are two of the most numerous places you can find mosquitoes.
Peak Biting Times By Season and by Hour
Mosquito activity also depends on the species.
The tiger mosquito, common across much of the eastern United States, bites during the day and often peaks in the early afternoon. Other species are most active at dusk and dawn. Some feed primarily at night.
Why Mosquito Season Is Getting Longer
Warmer average temperatures allow mosquitoes to become active earlier in spring and remain active later into fall.
This trend has been observed in research settings, including Dr. Reiskind’s lab. For outdoor enthusiasts, that means protection may be needed beyond traditional “summer months.” That’s especially true in flood-prone areas or around homes where standing water can develop.
Year-Round Protection Makes More Sense Than You Think
If mosquito season is shifting, your protection strategy should adapt to it too.
Reduce standing water around your home. Use EPA-registered repellents when mosquitoes are active. And consider clothing designed to help repel mosquitoes and ticks.
Insect Shield permethrin-treated clothing provides built-in protection through contact with the fabric. Because it’s part of what you wear, it works quietly in the background, whether it’s early spring, peak summer, or a warm fall afternoon.
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Mosquito FAQs
When does mosquito season start?
Mosquito season begins when temperatures are consistently warm enough for mosquitoes to fly and reproduce. In some regions, that can be late winter or early spring.
What month do mosquitoes go away?
Mosquito activity declines after sustained cold temperatures. In warmer regions, activity may continue late into fall or even winter.
Is mosquito season getting longer?
In many areas, warmer temperatures are allowing mosquitoes to be active earlier in spring and later into fall.
What time of day are mosquitoes most active?
It depends on the species. Some mosquitoes are active and can bite during the day, while others are more active at dusk, dawn, or night.
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