Microwave assisted magnetization switching is implemented for Co/Pt multilayer nanodots. Application of rf fields significantly reduces the switching field of Co/Pt nanodots, and the reduction behavior is similar to that predicted by macrospin simulation. However, some dots are inert to rf fields. These very different switching behaviors may be attributable to a slight difference in the nucleation process of a reversed domain. It is also found that the switching field reduction remains almost constant regardless of the pulse width and interval of rf fields, indicating that the switching event is sufficiently fast and reliable in the ns regime.