I was told by a sod guy that Fall and Winter was to best time to lay bermuda sod in the South. His reasons were that the weather was cool, we usually got rains in the winter, and watering was usually not necessary. He said that the sod roots all winter even though the top was dormant. I see lots of dormant sod installs in my area during the winter. They seem to be working well. I always thought early Summer would be the best time.