How often should you water your lawn — and for how long?
Most struggling lawns aren't underwatered — they're watered wrong. Frequent light sprinklings train roots to live at the surface, exactly where heat kills them. Here's the simple system that works in both Illinois and Texas.
The target: about an inch a week
Including rainfall, most established lawns want roughly one inch of water per week — up to 1.5 inches in serious Texas heat. Deliver it in one or two deep sessions, not daily sips. Deep, infrequent watering pushes roots down; shallow daily watering invites disease and weeds.
The tuna can test
No flow meters needed. Set a few empty tuna cans (about an inch tall) around the lawn, run your sprinkler, and time how long it takes to fill them. That's your session length. Most sprinklers take 30–60 minutes per zone to deliver an inch.
Water early, never at night
Early morning — roughly 5 to 9 a.m. — is ideal: low evaporation, and blades dry quickly once the sun is up. Evening watering leaves grass wet overnight, which is an open invitation to fungus. Midday watering mostly waters the air.
Know the stress signals
Folded blades, a dull gray-green cast, and footprints that linger mean the lawn is thirsty. Water that day — and skip mowing until it recovers, since cutting drought-stressed turf compounds the damage (more in our post on why lawns brown after mowing).
One more thing for Texas readers: check your city's watering schedule before setting timers — most metros restrict days and hours in summer. Our Texas summer guide has the full heat playbook.