Blue Earth is a city in Faribault County, Minnesota, United States, at the confluence of the east and west branches of the Blue Earth River. The population was 3,174 at the 2020 census. It is the county seat of Faribault County. It is home to a statue of the Jolly Green Giant. Additionally, Interstate 90 is centered on Blue Earth, as the east and west construction teams met here in 1978. As a tribute, there is a golden stripe of concrete on the interstate near Blue Earth. This draws an analogy to the golden spike set in the first transcontinental railroad. Approximately three miles south of Blue Earth is the Blue Earth Municipal Airport.