Sod is most frequently installed in the spring, summer and fall months. During these seasons, the soil and air temperatures are warm enough for the grass to grow efficiently. Although it's not ideal, you can install sod in the winter months as long as the ground is not frozen. Keep sod sufficiently moist until it roots into the ground, which is not difficult during winter's cool, wet weather.
Till the soil to a depth of 3 to 4 inches. Remove debris like rocks, weeds and stones. Smooth the soil with a garden rake.
Fill a lawn roller with water and roll the entire yard to firm up the surface.
Lay the sod. Start along a straight edge like a garden bed, driveway or sidewalk. Unroll each piece so that the seams stagger like bricks.
Trim the sod around objects and other irregular shapes using a utility knife.
Roll the sod with a water-filled lawn roller. This ensures sufficient sod-to-soil contact.
Irrigate with lawn sprinklers to keep the top 1 to 2 inches of soil moist at all times throughout the winter. Rainfall may be sufficient, so check the soil moisture with a soil moisture probe before irrigating.