Warm-season versus cool-season grass
Grass type follows climate first. Every lawn grass falls into one of two groups, and the group decides whether it survives your winters and summers. Choosing the wrong group is the most common reason a new lawn struggles, so start here before you pick a specific grass.
Warm-season grasses grow best in the heat of late spring through summer. They thrive across the southern United States, where summers are long and hot. They go dormant and turn brown in cool weather, then green up again when the soil warms. Bermuda, Zoysia, St. Augustine, and Centipede are the common warm-season sods.
Cool-season grasses grow best in the milder temperatures of spring and fall. They suit the northern United States, where winters are cold. They stay green through cool weather and can brown or thin in extreme summer heat. Kentucky Bluegrass and Tall Fescue are the common cool-season sods.
Between the two zones lies the transition zone, a band across the middle of the country. Here both groups face stress, since summers are too hot for many cool-season grasses and winters are too cold for many warm-season ones. Gardeners in this band often choose the toughest options from each group, such as Tall Fescue or Zoysia. Match the group to your region first, then narrow to a specific grass. The calculator sizes the order once you know which sod you will lay.