Ashton is a city in Fremont County, Idaho, United States. It is part of the Rexburg, Idaho Micropolitan Statistical Area. The population was 1,129 at the 2000 census. The district is noted for seed potato production and bills itself as the world's largest seed potato growing area.
Ashton is located at 44°4′20″N 111°26′52″W / 44.07222°N 111.44778°W / 44.07222; -111.44778 (44.072092, -111.447858). It is at an elevation of 5,260 feet (1,600 m).
According to the United States Census Bureau, the city has a total area of 0.6 square miles (1.4 km²), all of it land.