It depends on the temperature! Extreme heat is hard on the grass. The sod is cut in square yards (16 inches x 81 inches) that are rolled up to the size of a large cinder block and heat builds up in the roll. It is recommended that the sod be put back in the ground as soon as possible and watered thoroughly. In the winter there is a longer “shelf” life between harvesting and installation. Although it is also important not to let sod freeze on the pallet. Best to install as soon as possible.