If you are an avid golfer, a good rule of thumb is to change them every 12-15 rounds. The less you play and the wiser you are about not walking on hard surfaces that may damage the spikes like (concrete, pavement, asphalt, etc) the longer they will last. If you only play a few times a year and are good with their care, you can expect them to last a couple of years before needing to be replaced.