How often you should change ice auger blades depends greatly on how much you use your ice auger.  Generally speaking, if you use your ice auger frequently, you should sharpen it three to four times a season and replace it at the beginning of every new ice fishing season. If you use your ice auger sparingly, sharpen your blades halfway through each season and replace them every 2 to 3 years.  Just be sure you inspect them regularly and take notice when they begin to look in poor shape or if you notice a significant change in the blades’ performance.