The answer to 'why is my sod bare spots' is that there are several common causes, including poor soil preparation, improper installation, lack of watering, or pest/disease issues. Bare spots can occur when the sod doesn't properly establish roots and bond with the underlying soil.
Some key symptoms to look for are patchy, thin growth, exposed dirt, and a spongy or loose texture. To fix bare spots, you'll need to identify and address the root cause. This may involve regrading the soil, overseeding, adjusting your watering schedule, or treating any pest or disease problems.