Rare isotope Accelerator complex for ON – line experiments (RAON) is the name of a heavy ion linear accelerator in Daejeon, Korea. The RAON consists of superconducting Radio Frequency (SRF) cavities and superconducting magnets and can serve variable rare isotope beams. For the operation of RAON, three cryogenic plants have to supply the cryogenic helium and cool down the accelerator under the operating temperature, 2.05 K, 4.5 K, and 40 K. Two of the cryogenic plants, which have unique specifications, are on bidding stage and the layout of cryogenic plants and their utilities are fixed. Control logics of plant interfaces have been developed. This paper shows brief specifications of cryogenic plants, operation scenario, layout, utilities, and schedules.