Warm snow cover promotes gray snow mold
We are seeing gray snow mold now that the snow has melted from north-facing areas. These matted areas occur when your grass is covered with snow for prolonged periods and temperatures are slightly below freezing.
Freeze-thaw promotes snow mold
The freeze and thaw that takes place under the snow are what causes this disease to form in the spring. The damage caused by snow molds is seldom serious. Now that the snow is gone, the best thing to do is gently rake the matted turf allowing it to dry. Gray snow mold activity stops when the temperature exceeds 45° F or the surface dries. In a few weeks, your grass will be green and healthy.