Counties Passed through: Jewell, Cloud
K-28 originally continued north along K-14 from Jewell to Mankato, then west along US 36, then north to the Nebraska border. By 1932, the segment between Concordia and Mankato was gravel, and the segment north of US 36 was dirt. The dirt segment was gravelled, and the Concordia-Mankato segment was hard-surfaced, by 1936. The segment between US 36 was hard-surfaced by 1945, and the remainder was hard-surfaced by 1953.