A neighbor planted a lawn at his new house in 2012. It was dry and hot and most of it died; crabgrass filled in up to about 90 percent. Hose irrigated; sandy soil. He reseeded the front yard in fall 2012, and it established fairly well. In late August, 2013 he started to redo the back yard, about 4000 full sun additional sqft. He sprayed with Ortho Weed and Crabgrass Control. Which was fairly effective. I am not sure I have these steps correct. As I recall...then he cut short. Then he dethatched with a rotary dethatch blade. Then raked up residue. He applied seed by throwing it by hand. Then applied about 20 bags of compost. Then he scattered the dead grass residue like straw to help hold moisture. High temps have been between 80 and 85 with light rain. He is sprinkling by hose with an oscillating sprinkler. Watering about 30 minutes per zone every day. I estimate about a tenth of an inch, daily. Seed was retail Pennington Smart Seed. After about 10 days, now, so far, it is about 3 inches high. http://www.penningtonseed.com/products/smart-seed/sun-and-shade-mix I suggested that a good fertilizer be applied. I will check again soon.