With more humidity, mosquitoes have become a health concern for California.
Leaving many wondering when mosquito season will come to an end, and we can put our bug zappers away.

Mosquito activity has a lot to do with temperature and environmental conditions.
So mosquito season can vary, sometimes carrying into the later months.

Deadlines vary from inland to coastal communities.

California’s variety of climate conditions from mountains to desert, to beach communities, can create a wide range of seasonal deadlines for mosquito activity.

The colder conditions of Northern California and its inland mountain areas will create a shorter season when it comes to mosquito activity.  The cold temps slow it down, while bringing it to an end as it nears late September to October.

Mosquitoes linger with warmer temperatures throughout the year.

Mosquitoes are a cold blooded creature and cannot withstand the colder temperatures.

BUT for California, as the nights get cooler, the warmer daytime temperatures along with many agricultural water sources can sustain populations longer than in the colder regions.

Things like standing water from untreated pools, buckets, clogged gutters etc. can remain breeding grounds for mosquitoes.  When missed these things can assist those lingering mosquitoes as the temperatures drop.

This along with warmer areas, like the desert, is one where mosquito populations can be found lasting from mid to late October.

Coastal communities.

Our Coastal Southern California has seen the longest mosquito season, sometimes even lasting into December!
OR even year-round in some areas.

The Marine layers and climate can prevent the colder temperatures needed to end activity of the invasive species like the Aedes Mosquito.

These tropical mosquitoes can survive with standing water, as well as warmer tropical temperatures.  Warmer temperatures and retained heat in buildings or concrete in some urban areas, along with standing water for breeding can extend mosquito activity into Fall and even Winter.

Warmer urban areas.

Urban heat islands play a role in extending the season within cities.
This occurs when concrete, pavement, and buildings in densely developed areas absorb and retain heat, causing urban temperatures to be several degrees warmer than surrounding rural areas.
This localized warmth can maintain temperatures above the 50°F threshold, allowing mosquitoes to remain reproductively active later into the fall and winter.

Doing your part to reduce the mosquito population as the temperatures drop.

Remove standing water, clear gutters of debris, trim plants and overgrown vegetation.

Mosquitoes can remain dormant in protected areas like trees, clogged gutters, leaf piles, and even garages.  Eggs remain ready to hatch in the Spring.

Removing areas where they might be protected help reduce the population.

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