Does your lawn still have a grayish-white fuzz on it even after the winter snow melts? If so, you have snow mold on your hands. Snow mold happens when deep snowfall occurs early in the cold weather season and prevents the ground from freezing. The cool, moist area between the ground and snow becomes the perfect breeding ground for snow mold to become active. As long as the ground stays moist, the mold will stick around. This type of mold is sometimes also seen in piles of un-raked leaves.