Devices, systems, and techniques for ramping one or more parameter values of electrical stimulation are disclosed. An implantable medical device may increase or decrease a parameter value, e.g., amplitude or pulse width, over time to reach a target value of the parameter. In one example, a memory may be configured to store a plurality of amplitude ramp schedules. At least one processor may be configured to obtain a stimulation parameter set that at least partially defines an electrical stimulation therapy, select one of the plurality of amplitude ramp schedules based on a signal frequency of the stimulation parameter set, and increase an amplitude of the electrical stimulation therapy during a ramp period defined by the selected amplitude ramp schedule.