Mosquitoes generally start to go away when temperatures drop below about 10 degrees Celsius (50 degrees Fahrenheit). This typically happens from mid- October to early November in many regions. As cold-blooded insects, mosquitoes become inactive and eventually disappear as the weather gets colder. The first frost is usually the reliable sign of the end of mosquito season. However, if warmer temperatures persist beyond this time, some mosquitoes may stay active or re-emerge from hibernation temporarily. In warmer or tropical areas, mosquitoes can be active year-round because temperatures do not drop low enough to cause dormancy.

Temperature Influence on Mosquito Activity

• Mosquitoes become less active and eventually go away when temperatures consistently drop to around 10°C (50°F) or lower.
• Cold weather slows their metabolism, making it difficult for mosquitoes to stay active.
• Hibernating mosquitoes seek sheltered spots and may live through winter, re-emerging on warm days.

Regional Variations

• Mosquito season varies based on climate. Warmer regions like parts of the southern U.S. or tropics may have mosquitoes all year.
• Cooler regions experience mosquito activity mostly between spring and fall, with a decline starting mid-fall.

Signs Mosquitoes Are Going Away

• Decreasing mosquito activity is often observed after the first frost.
• Mosquitoes tend to disappear or become very rare as cold weather settles in.