Insects have a variety of methods for surviving the coldness of winter.
Migration is one strategy for escaping the killing temperatures.
The Monarch Butterfly is the foremost example of this maneuver, but other insects migrate into northern areas from the southern states in the Spring. Crop pests are the most obvious of these migrants. Overwintering as Larvae. Many insects successfully pass the winter as immature larvae. Some grubs simply burrow deeper into the soil to escape the cold.