Nippon Railway
Kuroiso Station began operation on December 1, 1886 as a station of Nippon Railway. The Nippon Railway was nationalized on November 1, 1906, and the station became a JGR station From June 1, 1949, the station came under the control of the JNR. The portion of the Utsunomiya Line from Hōshakuji - Kuroiso was electrified (1.5 kV DC) on May 22, 1959, and the section from Kuroiso - Shiroishi was electrified (20 kV 50 Hz AC) on July 1, 1959. With the privatization of JNR on April 1 1987, the station came under the control of JR East.