Footprints remain in the turf after walking across it. The actual amount of water required depends upon the soil type and weather conditions. When irrigating turfgrass, the general rule of thumb is to water deeply but infrequently. Watering deeply promotes the development of deep root systems. The best time to water a lawn is early morning.
Winds are generally light and temperatures cool so little water is lost through evaporation.
Watering at midday is less efficient because large amounts of water are lost through evaporation and strong winds may cause uneven water distribution. Strong midday winds may also carry the water onto driveways and streets and waste considerable amounts of water. Watering the lawn in the evening or at night may increase disease problems. Individuals wishing to establish a new lawn should prepare the site this summer. The best time to seed lawns in Iowa is mid-August through September.