Snow mold is a fungal problem that hits lawns in cold weather. It gets its name due to its tendency to develop underneath a layer of snow on top of the lawn, and only appears when the snow starts to melt.
It is a common lawn disease that can infect any grass, and is caused by a lack of air circulation and the damp environment that exists under the cover of snow or wet leaves. It will show as patches of matted and dying grass once the snow thaws, but it is easily treatable.
