How to Water Your Lawn

Almost everyone waters their lawn wrong, and it's usually the same mistake: a little bit every day. The rule that fixes most lawns is simple — waterdeeply and infrequently. Here's why that works, and how to know exactly how much and when.

Why deep and infrequent wins

Light daily watering keeps moisture at the surface, so roots stay shallow and lazy — which makes your lawn weak in heat and quick to brown. Soaking deeply, then letting the top dry out, trains roots to grow downchasing the water. Deep roots are what carry a lawn through a dry spell. One good soak beats seven sprinkles every time.

How much water a lawn actually needs

The standard target is about 1 to 1.5 inches per week, rain included — delivered in one or two sessions, not seven. In peak summer heat some lawns want a bit more; in spring and fall, less. Figure out how long your sprinklers need to run to hit that with the lawn watering calculator, and see what it's costing you with the watering cost calculator.

The tuna-can test

You don't have to trust the math blind — measure it. Set a few empty tuna cans (or any straight-sided container) around the lawn, run the sprinklers, and time how long it takes to collect about an inch. That's your run time for the week, calibrated to your exact sprinklers and pressure. Do it once each spring and you'll never over- or under-water again.

The best time of day: early morning

Water before ~9 a.m. Early morning means less evaporation (cool, calm air) and leaves that dry out over the day — which matters, because watering at night leaves grass wet for hours and invites fungus. Midday works in a pinch but wastes water to evaporation. Morning is the sweet spot on every count.

Let the lawn tell you

Grass signals thirst before it browns: footprints that stay pressed down, a dull blue-green color, blades folding in on themselves. That's your cue to soak — not to switch to daily sprinkles. And remember mowing ties in: taller grass shades its own roots and holds moisture longer, so set a sensible height with the mowing height calculator. For how watering fits with the other fundamentals, see Lawn Care 101.