Field ants nest in soil and when colonies are located near foundations they become active unusually early due to the building's warmth. As lawn areas are too cool and there is little food available, they commonly move into homes. Problems in homes are usually transitory, as they move to forage outdoors when aphid honeydew and other foods become available. Control is best if the nest can be located and treated. Generally the nest is outdoors.
Early spring is also the period when most common termite species swarm.
The swarm consist of the winged reproductive termite. Often this termite doesn't cause problems as they often feed on materials such as woody brush, and other woody materials in the soil. However, they do occur in homes. However the presence of winged reproductive termites in the early spring in the home is often the first evidence a homeowner has of a building infestation. A professional exterminator should be contacted if winged termites are emerging from within the house.