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Snow mold isn’t one thing. Rather, it’s the name given to a group of similar lawn diseases that thrive in cool, wet conditions. All snow mold is caused by fungi, but the type of fungus varies depending on a range of factors, such as your grass type, soil condition and where you live. The two most common types of snow mold disease that occur on turf during cold weather conditions are pink snow mold (Microdochium patch) and gray snow mold (Typhula blight).
Unlike most lawn diseases, which prefer the warmer temperatures of spring and summer, snow mold thrives in cooler temperatures. Gray snow mold generally develops when snow cover remains for an extended period of time. Once the snow cover melts in the late winter or early spring, the fungus proliferates, causing telltale signs of disease (more on that shortly). Pink snow mold does not require snow cover to develop as it also proliferates when the grass is wet and temperatures are below 45 F.
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