Can I Mow After Overseeding? Your Quick Guide!

Overseeding the grass is a great way to improve the look and health of your lawn. When done correctly, it can help fill in bare spots, thicken up thin patches of grass, and get rid of weeds. But timing the process is important, which brings about the question ‘can I mow after overseeding?’

After overseeding the lawn, wait 2-3 weeks before mowing. This allows enough time for new grassroots to spread. By this point the grass will grow high enough for a light cut without risking damaging the seeds. It’s important to regularly water overseeded grass and not fertilize the lawn for 3 months.

Let’s look more into mowing after overseeding.

How long after overseeding should I wait to mow?

After overseeding your grass, it is best to wait 2-3 weeks before mowing. Some people claim that 4 days is long enough, but in this time your new grass won’t have a solid root foundation and will be quite short and thin. If you want to cut it sooner than the 2-week mark, you should try to wait until day 10 after overseeding to mow. This way the seeds and new grass has time to establish some roots and grow a bit more. Grass needs time and nutrients to become strong and luscious. Mowing too early risks damaging the grass.

The climate where you live can also influence the time you need to wait before mowing after overseeding. If you live in a warmer area or if it is the summer, you will need to wait closer to 3 weeks before mowing. Some gardeners even recommend waiting up until 6 weeks to mow after overseeding.

In the warmer weather, the ground is a lot drier which means grass can take longer to grow. It’s important to keep watering the lawn after overseeding, especially in the heat. This can reduce the time you need to wait before mowing and also makes sure the grass seeds are getting enough nutrients to grow.

In colder weather, you may not need to wait as long because rain will encourage lawn growth. But you should try not to cut your new grass when it is wet. This risks damaging the grass and your lawnmower.

If you can wait for your grass to be at least 4 inches after overseeding before mowing. You should aim to keep the height of your new grass above 3 inches. This will make sure that doesn’t put pressure on and disturb the new roots.

The best tips for mowing and growing after overseeding

To help you out with your lawn goals, we have compiled our quick list of top tips for mowing after overseeding!

Have sharp mower blades for clean cuts

How long after overseeding do I wait to mow?

By making sure your mower blades are sharpened before mowing the overseeded lawn, you will reduce the chances of tearing up the seeds. The sharper blades will cut through the new grass easily, protecting the health of the growing grass. You can always have a lawnmower maintenance service before mowing new grass. This way you can be sure that your mower won’t cause damage to the lawn.

After overseeding, mow carefully with patience

The last thing you want is to mow overseeded lawn quickly and damage the growing roots. This will ruin the efforts of overseeding in the first place. When you first mow after overseeding, you should travel across the lawn a bit slower than normal. When turning your mower around, go carefully to avoid catching and tearing new grass on the mower.

Set your lawn mower to its highest setting when mowing new grass

You only want to cut off, at most, 1/3 of the grass height at a time. With your new grass, it is best to put your mower on the highest setting. This will keep most of the base of the new grass, helping it to continue growing strong.

Leave grass clippings on the lawn when mowing after overseeding

When you mow after overseeding, you should leave your grass clippings spread across the yard. They provide more nutrients to the soil and help to maintain moisture levels. This promotes the growth of the grass seeds and can help fill patches on the lawn.

If I mow after overseeding will I kill off the new seeds?

Will mowing after overseeding kill new grass?

If you give your grass enough time to grow after overseeding, you won’t kill off the new seeds. It’s important to care for your lawn well, especially when you’re wanting new grass to grow. Following good lawn-care steps and waiting at least 10 days before mowing will lower your risk of killing off grass seeds.

When you do mow after overseeding, make sure you don’t cut into the soil where the seeds have been growing. You don’t want to risk cutting the seeds themselves or damaging the roots of the new grass. This is why it’s recommended to let the grass grow to above 4 inches and not mow it lower than 3 inches. This way your grass will continue to grow healthily and you won’t destroy the seeds when mowing.

How do I care for my lawn after overseeding?

After overseeding, your lawn will be sensitive while the new grass starts to grow. To look after the lawn before mowing, avoid walking or driving on the grass. Remove anything from the yard that could put pressure on the grass seeds. This could be outdoor furniture or kids’ toys. If you have only overseeded in certain areas, just make sure to not put anything there while the grass starts to grow. Pressure on these sections of the lawn can disrupt the germination process and stop the grass from growing.

Water your newly overseeded lawn lightly twice a day for the first four days. Then keep a regular watering schedule in the leadup to mowing after overseeding. By keeping moisture in your lawn soil, you are encouraging the growth of new grass with healthy grassroots. Keep this up for 2-3 weeks before mowing your lawn.

How to care for overseeded lawns after mowing

Should I fertilize my lawn after overseeding?

It’s best to avoid using any fertilizer on your lawn after overseeding for at least 3 weeks. The fertilizer can cause the old grass to grow quicker than the new seeds and this can disturb the roots of your new grass. In turn, this affects the ability of the grass seeds to grow properly and can leave you with more patches on your lawn.

Once the roots have developed after overseeding, you can use fertilizer. But it’s best to wait until after you have completed the first mow of an overseeded lawn and given the grass time to recover.

Make sure you also don’t spray any weed killers or pesticides after initially overseeding your lawn. You need to wait at least three months before using these products, giving the new grass time to grow and become stronger. Otherwise, you can end up reducing the growth and health of the new grass by up to 50%. But if you follow our guidelines and don’t pick up the fertilizer too soon, you can easily grow and mow overseeded lawns!

Wondering what the best time to mow your lawn is? We have all the answers for you! We can also give advice on how wide a mowing strip should be. For the best quality gardening and landscaping tools, check out our products at Canberra Diamond Blade Suppliers.

Newsletter Updates

Enter your email address below to subscribe to our newsletter