There are many reasons why ants find their way into our yards and homes, but the biggest reason is food. If ants have placed their nest anywhere near your house, there’s a good chance they’ll eventually find their way inside. While out searching for food sources to feed their colonies, they often find their way in through cracks and crevices in a home’s foundation or exterior walls. Once inside, they may decide to stay and create a satellite nest behind your walls to be near their new food source. Ants also move indoors to escape harsh weather conditions.