the next couple months represent the best rooting potential for your lawn IF you keep the soil hydrated. The grass will slow down due to temperature and available light but all of the plant's energy will be turned downward, into the soil. Remember, you don't have to water frequently, just deep. Once a week is probably appropriate right now unless it is warmer where you are at and then I would water twice. We want to get the water down 6-8 inches and that can only be achieved by watering DEEP!