Yes, the ants are marching in. The winter conditions will push ants inside. They do not like the cold and too much moisture in the way or rain, sleet or snow. Ants need dry warm areas to build colonies. Ants will forage for food and enough moisture to sustain their colonies. Once ants have established this the colony will grow causing sometimes heavy infestations inside your home. To help prevent ant infestation it is imperative to eliminate places around the exterior of your home that ants can thrive in. Such as: piles of leaves, rock piles, wood piles or thick landscaping areas.