The frequency with which you should replace your baseball socks will depend on how often you play and how well you take care of them. In general, you should replace your socks when they become worn out, stretched out, or lose their elasticity. Additionally, if you notice any holes or tears in your socks, it's a good sign that they need to be replaced. To make your socks last longer, try to wash them regularly and avoid exposing them to excessive heat or friction.