How To Measure Lawn Mower Cutting Height?

Alex Ortiz
By Alex Ortiz 10 Min Read
10 Min Read
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Hey there! 🌱 Have you ever wondered how short you should trim your grass? Well, I’m here to help you out. Mowing isn’t just about making your lawn look neat. It’s also about finding the right height for the grass. And trust me, this can make a huge difference! Sometimes, mowers don’t come with a guide to help you out, but don’t worry, we’ve got you covered. So, let’s dive into the world of perfect lawn heights, shall we?

Did you know that the height at which you mow your grass can change based on the time of year and the type of lawn you have? Yup! Just like how we wear different clothes for different seasons, our lawns need different care during different times.

Many lawnmowers might not have a fancy height indicator. But don’t let that stress you out. Measuring the height of your grass cut can be easy, and I’ll guide you through it.

Stay tuned because I’ll also be sharing the ideal mowing heights for different seasons. After all, your grass deserves the best all year round!

P.S. If you’re curious about when to mow in the UK, check out our other fun guide on the lawn mowing season over here. It’s packed with all the info you need!

Get ready, because in the next section, we’ll dive into the ins and outs of the perfect lawnmower grass cutting height. Buckle up! 🌿

How do you measure grass cutting height?

How exactly do we measure the height of our freshly cut grass? It’s easier than you think!

Method 1: The Ruler Trick

  1. Start by mowing a small patch of your lawn.
  2. After mowing, grab a ruler and place it in the trimmed area.
  3. Check how tall your grass is by seeing where the top of the grass blades hit on the ruler. Easy, right?

Method 2: Perfect for Rotary Mowers

If you have a rotary mower, this method is just for you. Don’t worry if it sounds technical; I’ll walk you through it step by step!

  1. Find a Flat Spot: Move your mower onto a flat and solid surface, like your driveway.
  2. Measure the Gap: Using a ruler, measure the distance between the ground and the bottom of your mower (the deck).
  3. Lift It Up: Carefully tip your mower and prop it up using a block of wood, making sure you can safely see the underside.
  4. Under the Deck: Now, measure the space between the blade and the bottom of the deck.
  5. Do a Little Math: Add the first measurement (gap from the ground to the bottom of the deck) to the second measurement (blade to deck). This sum gives you the actual height at which your grass will be cut.

Why is the knowing the height of cut important?

Ever wonder why the height you mow your grass at is such a big deal? Let’s break it down together!

Think of Mowing Like Giving Your Lawn a Haircut

Imagine giving someone a haircut. If you cut it too short, they might not be thrilled. And if you let it grow too long, it might get messy. Grass is a lot like that!

The Power of Regular Mowing:

Just like how trimming your hair regularly can make it look thicker and healthier, mowing your grass often does wonders. It encourages your lawn to grow strong, thick, and filled with all the good stuff (like nutrients) it needs to stay green and gorgeous. Plus, a thick lawn doesn’t let those pesky weeds pop up!

Finding That “Just Right” Length:

Here’s the key: you want to mow your grass at a height that’s not too short and not too long. Short enough so it looks neat and tidy (especially if you’re having friends over for a BBQ), but long enough so it doesn’t get too thirsty or hungry.

Different Grass, Different Needs:

And guess what? Not all grasses are the same. Some grass types love a close trim, while others like to stretch out a bit more. The thinner, delicate types of grass love being kept short. On the other hand, those rugged, broad grasses? They’re the rebels and might prefer a bit more length.

How high should the grass be after cutting?

Let’s get down to the nitty-gritty. Depending on where you are in the UK and what the season is, your lawn might need a different “haircut” length. Let’s break it down into an easy-to-follow guide.

P.S. If you want to get the scoop on the best mowing seasons in the UK, don’t forget to check out our special guide!

Lawn Types and Their Ideal Heights

Just like how some of us like short hair and some prefer long, lawns have their preferences too. The fancier your lawn, the shorter and more frequent its cuts. On the flip side, casual lawns are more laid-back about their lengths.

For Those Super Fancy Lawns (High Quality):

  • Spring: You’ll want it between 25-30mm. Think of this as the “fresh start” length.
  • Summer: A tad shorter at 20-25mm. Perfect for those summer picnics!
  • Autumn: Back to 25-30mm. Giving it a bit more protection as the weather cools.
  • Winter: Keep it cozy at 30-35mm.

For the Middle of the Road Lawns (Medium Quality):

  • Spring: A happy 30-35mm.
  • Summer: Trim it to 25-30mm.
  • Autumn: Back to 30-35mm. Autumn leaves and slightly taller grass are a match made in heaven.
  • Winter: Wrap it up at 35-40mm.

For the Easygoing Lawns (Low Quality or General Use):

  • Spring, Summer, Autumn, and Winter: These lawns like consistency! Keep it chill at 35-40mm year-round.

What happens if I cut the grass too short?

Did you give your lawn a super short trim? Well, we all make mistakes, but it’s essential to know what happens next. Let’s chat about what can go wrong when you snip your grass too close to the ground.

Grass Gets Stressed Out, Too!

Just like when we get a haircut that’s way too short, your grass can feel the stress. Here’s why:

  1. Disease Magnet: Short grass can become an easy target for nasty lawn diseases. It’s like your grass gets a cold because it doesn’t have enough leafy “clothes” to protect it.
  2. Drought Drama: Super short grass struggles when things get hot and dry. Why? Because grass stores its water and nutrients in those lovely green blades. When they’re super short, there’s less storage, which means your lawn might get thirsty way faster.
  3. Photosynthesis Problems: Grass needs its leaves to soak up sunlight and turn it into food (a process called photosynthesis). Without enough leaves, this process isn’t as effective, leaving your lawn hungry.

Watch Out for Scalping!

If your lawn has some bumps or isn’t super flat, a super short cut can lead to “scalping.” Sounds scary, right? Scalping means the mower cuts the grass down to the dirt in places. This isn’t just bad for looks; it can harm the grass’s health too.

What to Do Next?

If you’ve gone a bit too close with your mowing, don’t panic. Give your lawn some TLC with plenty of water and maybe a little extra fertilizer. And next time, aim to leave the grass a tad longer.


Alright, my green-thumbed friend! The secret sauce to having the happiest, healthiest lawns? It’s all about setting up your lawnmower just right. By mastering the art of choosing the perfect grass height, you’ll not only make your lawns look like they’re straight out of a magazine, but you’ll keep them thriving all year long.

And if you’re dreaming of running the best lawn mowing business in town, this is your golden ticket! Happy customers + gorgeous lawns = one unbeatable business.

Want more tips and tricks? Check out our guide on the best times to mow in the UK. With knowledge like this, you’re on the path to becoming a lawn legend!

Cheers to green grass and even greener futures! 🌾🌿🎉

Frequently Asked Questions

1. How do I measure the cutting height of my lawn mower?

To measure the cutting height of your lawn mower, locate the cutting height adjustment lever or knob, usually located near the wheels. Raise the mower to the highest setting. Measure the distance between the ground and the blade. This measurement represents the maximum cutting height.

2. Can I adjust the cutting height of my lawn mower?

Yes, most lawn mowers allow you to adjust the cutting height. Look for a cutting height adjustment lever or knob on your mower. By moving it up or down, you can raise or lower the cutting height to suit your needs.

3. How often should I adjust the cutting height of my lawn mower?

Adjusting the cutting height depends on your lawn's condition. In general, it is recommended to adjust the cutting height for the first mow of the season and after major changes in weather or grass growth. Regular adjustment is needed if you want to maintain a specific grass length.

4. What are the benefits of adjusting the cutting height on my lawn mower?

Adjusting the cutting height allows you to customize the grass height according to your preferences. Higher cutting heights are ideal for healthier grass growth, as they help shade the soil, reducing moisture evaporation and weed growth. Lower cutting heights provide a neater appearance and are suitable for shorter grass types.

5. Are there any safety precautions I should take while adjusting the cutting height?

Yes, always make sure the lawn mower is turned off and disconnected from any power source before attempting to adjust the cutting height. Use protective gloves and follow the manufacturer's instructions to avoid any potential injuries.

6. Can adjusting the cutting height of my lawn mower affect the overall performance?

Yes, adjusting the cutting height may affect the mower's performance. Lowering the cutting height too much can put extra strain on the engine and increase the risk of scalping the lawn. It is recommended to follow the manufacturer's recommendations for the optimal cutting height to maintain a balance between performance and grass health.

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