The answer is still uncertain.  All insects have the ability to survive cold weather.  They bury themselves underground, under leaves and under tree bark to keep them warm during the winter season.  This type of hunker down method of survival will allow them to survive the deepest freezes.

How Cold Does It Have To Get?

It varies from one insect to the next. For example, the greenbug can withstand temperatures of up to minus 9 degrees Fahrenheit, so they often survive the below 0 temperatures. 

How about Mosquitoes, Spiders and Fleas? 

As with many insects, female mosquitos find winter shelters called hibernacula.  They also produce a natural antifreeze in their blood to avoid ice crystals forming.   Honeybees are another example of insects adapted to freezing temperatures. They make honey to use as food during the winter and are able to generate heat by forming clusters and vibrating their wings. 

Fleas are a year-round nuisance, but they can die off outside when outside temperatures dip below freezing. In fact, once the temperatures fall to 37ºF, it’s cold enough to kill mature fleas as well as eggs, larvae, and pupae.  But those temps need to be sustained for 10 days or longer. Now that’s outside, but inside the home,  fleas survive all winter long no matter what the temperature is outdoors. Often times, the pupae can go dormant in cool areas like basements, then re-infest once the temperatures warm up again.

Spiders also have away of surviving the winter temps.  Obviously if they are inside in the warm heat but if they are locked outside they use the hunker down method to survive all winter long. 

In general, insects are able to survive cold temperatures.  They have a better chance if the temperature is stable and not fluctuating through thaws and freezes.   Blankets of snow benefit insects by insulating the ground and keeping the temperature surprisingly constant.

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