It depends on the climate. Zoysia grass is a warm-season grass, which means that it thrives during periods of hot summer temperatures. For example, in parts of Florida where summers are very hot and/or humid, zoysia should be planted in mid-spring to early summer when weather is cooler yet still warm enough for planting. In extremely cold climates or extremely dry areas, plant zoysia after danger of frost has passed. If you live in an area with freezing temperatures much of the year (such as Illinois), then wait until spring before planting zoysiagrass lawns.
How do I care for my newly installed zoysia grass?