What temperature is too hot to water grass?


by Jordana Weiss

When it's beautiful, sunny and warm outside, you may feel like giving your lawn a little TLC by giving it extra water. After all, you don't want your grass to turn brown during the next summer heat wave.

However, what temperature is too hot to water grass?

It’s tempting to water your lawn in hot weather, especially if your grass is already looking a bit thirsty. But in most cases, you shouldn't water your grass when it's 95°F or hotter because the water will likely evaporate before it reaches the roots.

In this article, we’ll give you tips on how to properly water and care for your lawn when it's hot outside.

Best time to water your lawn: Early morning.

In the summer months, it can be hard to figure out how to water your lawn effectively. Whether you’ve set up a sprinkler system or prefer to handle lawn care manually, you’ll need to determine the ideal time of day to water your lawn.

The best time to water your lawn in hot weather is usually early in the morning before the heat of the day sets in. When you water early in the day (generally before 10 am), it allows the grass to absorb the moisture it needs before the sun evaporates the water.

When to avoid watering your lawn: Late afternoon and evening.

You should always avoid watering your grass during the hottest part of the day (typically, in the afternoons), as most of the water will evaporate before it has a chance to penetrate the soil and reach the roots of your lawn.

Watering in the late evenings also isn't a good idea. If your lawn remains wet overnight, this may encourage disease and fungal growth. To prevent this, you need to allow the grass time to dry thoroughly before nightfall, which can be hard to time properly.

The bottom line: Watering your lawn in the morning can help keep it healthy and green, even during the hottest months of the year.

How long should I water my lawn during a hot summer?

How long you water your lawn depends largely on your grass type and sprinkler output. Work with a lawn care professional in your area to determine how many minutes you should water your grass during the hot summer months.

Related: 7 summer lawn care tips for healthy, green grass.

Should I water my lawn every day in extreme heat?

Watering your lawn every day in extreme heat is generally unnecessary. Just make sure that your grass gets at least 1 inch of water per week during the summer. Also, remember that it’s better to water deeply less often rather than give your grass a little water every day. 

Pro tip: For the best results, consider using a drip irrigation system instead of sprinklers and hoses.

Hire a lawn care professional near you.

Lawn care is something that many people enjoy, but not everyone has the time or inclination to stay on top of it. If you’d rather enjoy your lawn without the hassle, download Thumbtack today and hire a nearby lawn care professional who can help.

Related: 11 ways summer weather can damage your home.


Is it OK to water grass in 100°F weather?

No. Typically, you'll want to avoid watering your lawn in 100°F weather or else the water will evaporate before it reaches the roots of your grass. A good rule of thumb is to not water your grass when it's 95°F or hotter. But when in doubt, consult a lawn care service for their advice for your lawn.

How long can grass go without water in the summer?

This depends on your grass type, region and backyard conditions. Chat with a local lawn care professional to get personalized advice for your grass.

You can also use a few water-saving tips to determine if your grass actually needs water. For example, step on your grass to see if the blades spring back. If they do, they don’t need water right now. And, use a soil moisture sensor that will help you know when it’s time to water your grass.

Is 20 minutes too long to water grass?

How long you should water your grass is mostly dependent on your grass type, its condition and how much water your sprinkler system puts out. In some cases, 15 to 30 minutes is recommended. However, you should ask a professional for advice on how long (and often) you should water your grass.

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