The winter months are coming, and if you treat your lawn, you know that the cold weather months can be detrimental to the health of your grass. Winterizing fertilizer is an important part of lawn care that prepares your grass to deal with the vicious wind and snow of the winter. This fertilizer is usually applied in the late fall, around October and November to help your grass store more food and stay healthy. This fertilizer is important for your grass in the winter months. However, it is unlike most fertilizers in the sense that it does not promote growth during the fall, but rather creates a more resilient lawn.