Understanding the depth of the frost line, the level below the earth's surface at which point groundwater freezes, is crucial for a range of applications, from city planning and building construction to understanding and managing our climate. Across different states in the U.S., the frost line depth varies drastically, primarily influenced by the geographical location and overall climate of a region. The states situated closer to the poles generally have deeper frost lines due to more intense and prolonged cold temperatures, while those located towards the equator tend to have shallower frost lines.