How Long After Weed Killer Can You Cut Grass?

Are you curious about the optimal time to mow your lawn after applying weed killer? Explore the intricacies of post-weed-killer lawn care in our comprehensive guide.

Maintaining a healthy lawn is more than just weed control; it also involves other essential practices like fertilizing your lawn and selecting the right lawn mower batteries.

Wait at least 24-48 hours after applying weed killer to mow your lawn
Avoid watering your lawn for at least 24 hours after applying weed killer
Some herbicides can remain active in the soil for several months
Wait at least 24 hours before walking or allowing pets on the lawn after applying weed killer
Always follow the manufacturer’s instructions and safety precautions when using weed killer

Read on to discover the best practices for lawn care and ensure your yard is the envy of the neighborhood.

How Long After Weed Killer Can You Cut Grass?

You can cut the grass after one to two weeks, but it depends on how strong the active ingredient is. Make sure that:

  • The area is dry and there are no signs of rain or humidity in the forecast.
  • The weed killer has dried out completely (it’s usually visible as a white powder before this happens).
  • You make sure you don’t need to mow within 48 hours of applying the weed killer.

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How Long After Weed Killer Can You Mow The Lawn?

According to the University of Minnesota Extension, you should wait at least 24 hours before mowing after applying a preemergent herbicide (broadleaf weed control) to your lawn. 

Preemergent herbicides are typically applied in early spring and can keep broadleaf weeds from growing by preventing them from germinating. 

They also prevent seeds from sprouting, so they may cause changes in your grass growth pattern. 

If you apply preemergent herbicide too soon, you could damage or kill new grass shoots, which will set you back significantly when trying to get rid of weeds later on in the season.

If you do plan on using a preemergent herbicide this spring and want some help choosing one, check out our guide here!

How Long Does It Take For Grass To Grow Back After You’ve Cut It Or Sprayed It With Weed Killer?

In order to answer this question, you need to know what type of weed killer you used. There are many different types on the market that vary in effectiveness and longevity.

Generally speaking, if you used a product that has been designed for home use (like Roundup or Ortho), then it will probably take about three weeks for your grass to grow back after being cut. 

If you need something more powerful or longer lasting, check out our article on how long after applying weed killer can I mow my lawn?

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How Long Does It Take For Weed Killer To Kill The Grass?

There are many factors that determine how quickly your weeds will die after being treated with a chemical herbicide. 

The most important one is the type of weed killer you used and its concentration — in other words, how much liquid was applied to each square foot of lawn area. 

Also important is whether or not you watered in the weed killer as recommended by the manufacturer.

If you only sprayed a small amount of water-soluble liquid onto the top inch or two of soil surface, it may take longer than usual for grass to begin growing back in treated areas because there won’t be enough nutrients present for plants to take root right away. 

However, if you were careful about applying enough water and fertilizer at the same time (see below), then new growth should appear within a few weeks after application — usually sooner than if you had simply mowed over topsoil without first treating it with an herbicide containing glyphosate active ingredient (such as Roundup).

How Long After Applying Weed Killer Before You Can Mow?

After applying weed killer to your lawn, the grass will start to die within a few days. You should wait at least two weeks before you mow the lawn again. 

If you wait too long, then it may be difficult to get a good cut because the dead leaves and stalks can build up in clumps on the lawn.

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Can You Cut Grass That Has Been Treated With Weed Killer?

Yes, you can cut your grass after applying weed killer. In fact, it’s recommended that you do so as soon as possible so that the grass doesn’t die from lack of sunlight or water. However, it is important to wait a few days before cutting your lawn again. 

This gives the chemical enough time to kill off any unwanted weeds and prevent them from growing back quickly. 

If you cut too soon after applying weed killer, then there’s a good chance that some of those unwanted plants will survive and grow back even stronger than before!

How Long Does It Take For Weed Killer To Lose Its Effectiveness?

In general, wait until you have seen no growth in the treated area for at least four months. If it’s a fast-acting weed killer, you can cut sooner (as soon as 2 weeks). If it’s a slow-acting herbicide, you should wait longer (5 or 6 months).

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What Happens If You Cut Your Grass Too Soon After Applying Weed Killer?

You can cut your lawn as soon as you’ve applied the weed killer. The weed killer will not kill the grass, so don’t worry about that. 

The only thing to be careful of is not applying too much of it and washing it into nearby waterways or onto other areas where it may cause problems for animals or people who live nearby.


You can cut your grass after spraying or cutting the weeds in your lawn. It’s important to wait until the weed killer has had time to work its way into the soil before doing so. 

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Further Reading

If you want to learn more about lawn treatment and how to take care of your grass, check out these helpful articles:

Should You Mow Your Lawn Before or After Lawn Treatment? – This article explains the pros and cons of mowing your lawn before or after applying lawn treatment and offers some tips for a successful lawn care routine.

How Long to Cut Grass After Spraying Weed Killer? – This article provides useful information on how long you should wait before cutting your grass after applying weed killer and discusses the risks of cutting too soon.

When Can You Mow After Spraying Concentrated Weed Killer? – This article offers advice on how to safely mow your lawn after using concentrated weed killer and explains why it’s important to wait for a certain period of time.


How long do you wait to cut the grass after a lawn treatment?

You should wait to mow for 24 to 48 hours post treatment. This is because it takes at least 24 hours for broadleaf weed control to translocate throughout the vascular system of the plant. If you cut the grass too soon, you’re not letting the herbicide get into the plant.

Can you water your lawn after applying weed killer?

It’s generally safe to water your lawn after applying weed killer, but you should wait at least 24 hours before doing so. This will allow the herbicide to penetrate the weeds and ensure that it doesn’t get washed away before it has a chance to work.

How long does weed killer stay in the soil?

The length of time that weed killer stays in the soil depends on several factors, including the type of herbicide used and the environmental conditions. Some herbicides can remain active in the soil for several months, while others break down quickly and have no residual effect.

Is it safe to walk on the lawn after applying weed killer?

It’s generally safe to walk on the lawn after applying weed killer, but you should avoid doing so for at least 24 hours. This will give the herbicide time to dry and be absorbed by the weeds.

Can pets go on the lawn after applying weed killer?

Pets should be kept off the lawn for at least 24 hours after applying weed killer. Some herbicides can be harmful to pets if ingested, so it’s important to follow the manufacturer’s instructions and keep your pets away from treated areas until it’s safe for them to return.