My neighbor waters his lawn at noon. Every day. The water runs down the driveway in little rivers while the sun beats down. Half of it evaporates before it hits the roots and his lawn still looks like toasted coconut. I used to do the same thing until a landscaper at a barbecue set me straight.

Water your lawn between 4 AM and 7 AM. Not at noon. Not in the evening. Early morning is the only time that gives your grass a fighting chance during a heatwave.

Why early morning wins

Three reasons. First: the ground is cool from the night, so water soaks in instead of evaporating on contact. Second: the sun hasn’t cranked up yet, so the water has hours to penetrate deep before evaporation kicks in. Third: by the time the midday heat hits, the roots are already hydrated and the grass can handle the stress.

Evening watering is a close second — but it comes with a risk. If grass stays wet all night, you get fungus. Brown patch, dollar spot, all the lawn diseases thrive in warm wet darkness. If you must water in the evening, do it early enough that the blades have time to dry before full dark — like 5-7 PM, not 9 PM.

Deep and infrequent beats shallow and daily

Most people water too often and not deeply enough. A daily five-minute sprinkle wets the top half-inch of soil and trains grass roots to stay shallow. Shallow roots = grass that burns the moment the temperature spikes.

Water deeply two or three times a week instead of lightly every day. Put a tuna can on the lawn while you water. When it fills to about half an inch, you’re done for that zone. That’s the right amount per session — enough to reach roots 6-8 inches down.

I switched to deep watering last summer and it was the difference between a brown lawn and a lawn that stayed green through a 100-degree week. Same water bill, actually — the total volume was similar, but the water actually reached the roots instead of evaporating on the surface.

Heatwave-specific moves

Don’t mow during a heatwave. Longer grass shades the soil and keeps roots cooler. Raise your mower deck to the highest setting and wait until the heat breaks. If you absolutely must mow, do it in the evening and leave the clippings — they act as mulch and hold in moisture.

Also: if your grass goes dormant and turns brown during extreme heat, that is normal. It’s not dead — it’s protecting itself. Don’t try to water it back to green. Wait for cooler weather and it’ll bounce back.

• Water time: 4-7 AM (best) or 5-7 PM (acceptable)
• Frequency: 2-3 deep waterings per week, not daily sprinkles
• Amount: About half an inch per zone — use a tuna can to measure
• Heatwave: Don’t mow. If you must, raise deck to max height
• Never: Noon watering — most of it evaporates before reaching roots