How much do I need to water new grass seed? How long should I water grass seed?

Watering requirements for new grass seed truly depend on weather conditions. More water is required during hot and dry times, less water when cool. During hot times, 2-3x per day at only about 10-minute watering intervals. You want the soil to be moist, not wet and water running which will wash the seeds.

Do not water after 6pm as you may introduce conditions for mold/fungus with the seeds sitting wet all night long.