Lawn Water Calculator
Tip: Water deeply and infrequently. Aim to moisten the soil to a depth of 6 inches each session.
Water in the early morning (5–9 AM) to reduce evaporation and disease risk.
How Much Water Does Your Lawn Need?
Most lawns need 1–1.5 inches of water per week, including rainfall.
Divide weekly water into 2–3 sessions for deep root growth.
Each session should deliver about 0.5 inches of water.
Use a rain gauge or empty tuna can to measure sprinkler output.
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Frequently Asked Questions
Most sprinklers deliver about 0.5 inches per 30 minutes. For a typical lawn needing 1 inch per week, water 30 minutes per session, 2–3 times per week. Actual time varies by sprinkler type and water pressure — measure with a rain gauge.
Water deeply 2–3 times per week rather than lightly every day. Deep, infrequent watering encourages deep root growth, making your lawn more drought-resistant. Daily shallow watering promotes weak, shallow roots.
Early morning (5–9 AM) is ideal. The wind is calm, temperatures are cool, and water has time to soak in before evaporation. Avoid evening watering — grass stays wet overnight, increasing disease risk. Midday watering wastes water through evaporation.
Walk on the grass — if your footprints remain visible for more than a few minutes, the lawn needs water. Grass blades that fold or curl lengthwise, or turn a blue-gray color, are also signs of drought stress.
Yes. In summer heat, increase watering frequency. In spring and fall, reduce it. In winter for cool season grasses, water only if there's been no precipitation for 2–3 weeks. Warm season grasses need little to no water when dormant.