Re: Do ants hibernate in the winter?

Ants usually stay in their underground chambers surviving at more 
uniformly warm soil temperatures and eating stored food.   Other insects 
have different strategies.   Grasshoppers are also underground, but as 
unhatched eggs.   The adults died in the fall, leaving egg pods in the 
ground.   Some mosquitoes overwinter as adults in protected areas, others 
as eggs underwater and under ice.  Other insects (such as some butterflies 
like the mourning cloak) live as adults in protected areas like some 
mosquitoes  and may emerge on warm days during the winter.   Most moths 
and butterflies survive as either pupae or eggs, sometimes underground.   
For a good look at how animals (including insects) cope with winter, see 
the old but informative book:

Morgan, Ann Haven. 1939. Field Book of Animals in Winter.  G. P. Putnam, 
New York.

You can find this book in a library or in a used bookstore.