Cool-season grasses are types of grass that thrive in the cooler temperatures of spring and fall. They grow best when temperatures are between 60°F and 75°F (15°C to 24°C). These grasses are commonly found in northern regions and are ideal for areas with cold winters and moderate summers. Popular varieties include Kentucky bluegrass, fescue, and ryegrass. These grasses typically have a lush, green appearance and can withstand cold weather, making them suitable for lawns, parks, and sports fields. They tend to go dormant during the hot summer months, requiring less water and maintenance during that time. Proper care can help maintain their health and appearance throughout the growing season.