How often should you mow your lawn? The complete answer

The honest answer is: mow whenever your grass has grown by a third. That's the one rule that works for every grass type, every season, every climate. In peak summer that's usually weekly. In winter it can be once a month or not at all. Forget the calendar and watch the grass instead.

What is the one-third rule?

Never cut more than one-third of the blade off in a single mow.

That's it. That's the rule the lawn-care world has been built on for fifty years. Cut more than a third and you stress the grass badly. The roots stop growing for days while the plant scrambles to grow new leaves. You also expose the soil to sun, which dries it out and lets weed seeds sprout.

So if your lawn looks best at 4cm (finger-width), you mow when it hits 6cm. Not before. Not after.

Why does this rule work for every grass type?

Because it's about plant biology, not grass species. All grasses grow from the base, not the tip. The leaf above ground is the solar panel that feeds the roots. Cut too much off and you cut off the food supply.

The only thing that changes between grass types is the best height to keep them at. The one-third rule still applies on top of that.

How often is that in real life?

It depends on growth speed, which changes massively across the year.

Warm-season grasses (buffalo, kikuyu, couch, zoysia) grow fastest in heat. Cool-season grasses (fescue, ryegrass, bluegrass) grow fastest in spring and autumn. Both slow right down in winter.

What if I missed a mow and the grass is too long?

Don't scalp it back in one go. You'll wreck the lawn.

Instead, drop the mower one notch and mow. Wait three or four days. Drop it another notch. Mow again. Repeat until you're back to your normal height. Yes it's annoying. But scalping a long lawn turns it brown for weeks.

Common mistakes people make

Mowing too short

The most common mistake. Shorter grass looks tidy for a day. Then it dries out, gets stressed, and weeds move in. Longer grass shades the soil and beats weeds without doing anything. As a rule, leave it longer than feels right.

Mowing wet grass

Wet clippings clump and clog the mower. They also dump in piles that smother the grass underneath. Wait until the dew is off and the lawn is dry on top.

Mowing in the heat

Hot afternoons stress the lawn. Cutting on top of that makes it worse. Mow early morning or late afternoon when it's cool.

Same direction every time

The grass leans whichever way you mow. Always going the same direction makes ruts and creates stripes that look worn. Change direction each mow.

Dull blades

A dull blade rips the grass instead of cutting it. You'll see ragged brown tips on every leaf the next day. Sharpen the blade once a year, more if you mow over 200m².

Cutting on a wet morning right after the dew falls

The first mow after rain is tempting because the lawn is growing fast. But wet grass clumps and chokes the mower. Wait until the surface is dry, even if it pushes the mow a day later.

Mowing brown winter grass

A lawn that's gone brown in winter dormancy doesn't need a mow. You'll just stir up dust and stress the crown. Wait until you see fresh green growth coming through.

What height is right for my grass?

Mower setting numbers vary by brand but the principle is the same.

• Settings 1-2 (lowest): very short — for couch and bermuda in summer.
• Settings 3-4 (mid): finger-width — for kikuyu and most warm-season grasses.
• Settings 5-7 (highest): longer — for buffalo, tall fescue, ryegrass, and winter mowing on everything.

When in doubt, go higher. Leaving the grass a bit longer protects the roots, shades the soil, and almost never causes a problem. Mowing too short causes most lawn problems.

Should I bag the clippings or leave them?

Leave them most of the time. Short clippings break down in a few days and feed the lawn nitrogen for free. This is called mulch-mowing.

Bag the clippings when:

• The grass got too long and the clippings are big and clumpy
• You're treating a disease (don't spread spores)
• You've got lots of weed seedheads (don't spread seed)

When should I stop mowing for winter?

Watch the grass, not the calendar. If it hasn't grown enough to need a cut by the one-third rule, don't mow. Mowing a dormant lawn does nothing useful and stresses it.

In warm climates, you might get away with skipping winter mowing entirely. In cool climates, you might still cut every 2-3 weeks if there's been rain and mild weather.

Frequently asked questions

Can I mow once every two weeks all year?

No. In peak growth that's way too rarely and you'll scalp the lawn when you finally do mow. In winter it might be too often. Watch the grass height, not the calendar.

Does mowing more often make the grass grow faster?

A little bit, yes. Cutting the tip wakes up the plant and triggers more lateral growth. That's good for filling in patches but uses more water and nutrients. Most home lawns don't need this.

What if my lawn looks patchy after I mow?

Probably mowing too short for the grass type, or the blade is dull. Raise the mower one or two notches and sharpen the blade.

Is it bad to skip a mow?

Not unless the grass gets so long that catching up means scalping it. One missed week is fine. Three missed weeks in peak summer is a problem.

Should I water before or after mowing?

After. Mowing dry grass cuts cleanly. Watering after helps the grass bounce back.

How Lawnova helps

Lawnova works out your exact mowing schedule for your grass type, region, and the recent weather. We send you a reminder when your lawn has likely hit that one-third trigger point. No more guessing. Sign up here.