How Often Should You Cut Your Grass in Summer?

It's a question I get asked a lot — usually by someone who's come back from a two-week holiday to find their lawn has turned into a meadow. How often should you actually be cutting your grass? The honest answer is: more often than most people do, especially in Cornwall, and especially in summer.

Down here, the combination of Atlantic rainfall and mild temperatures creates near-ideal growing conditions for grass from April through to October. There's no real summer drought to slow things down the way there is in the south-east of England, and the warmth keeps roots active. If you're cutting once a fortnight in June and July, you're already behind.

The One-Third Rule — Explained Simply

Before anything else, it helps to understand the principle that underpins all good lawn care: never remove more than one third of the grass blade height in a single cut.

This isn't just a guideline — it's the difference between a lawn that thrives and one that struggles. When you cut too much in one go, the grass goes into shock. It puts all its energy into regrowing leaf at the expense of root development. The result is a weakened, shallow-rooted lawn that's more susceptible to drought stress, disease and weed invasion.

If you're keeping your lawn at 4cm (a good summer height), you should be cutting before it reaches 6cm. If you leave it to reach 10cm and then cut it back to 4cm, you've removed well over a third and put the grass under significant stress. This is why regular cutting matters — not just for appearance, but for the health of the lawn itself.

Why Cornwall Grass Grows Faster

If you've moved to Cornwall from somewhere in the Midlands or north of England, you may have been caught out by this. Grass here simply grows faster, for longer, than most of the UK.

The reasons are straightforward: Cornwall gets more rainfall than most of England, particularly on the north coast around Newquay and Perranporth. The Atlantic keeps temperatures mild — we rarely see the kind of summer heat that browns off lawns further east, so our grass stays green and active right through the season. And because there's no true summer drought, there's no natural slow-down.

The result is that a lawn that might need cutting every ten days in Surrey needs cutting every seven days in Cornwall during peak growing season. That's not an exaggeration — in May and June, a week's growth can be surprisingly dramatic.

How Often to Cut by Season

Here's a rough guide to mowing frequency in Cornwall throughout the year:

• March–April: Every 10–14 days, depending on conditions. Growth is picking up but not yet at full pace. Start at a higher blade setting and bring it down gradually.
• May–August: Every 7 days — weekly cutting is the standard for a well-kept lawn in Cornwall during these months. In a particularly warm, wet spell, you may even find every 5–6 days keeps things neater.
• September–October: Every 10–14 days. Growth starts to slow from September onwards, though Cornwall's mild autumn means the lawn doesn't stop entirely until late October or November.
• November–February: Cut only when growth is actively occurring and conditions are right — typically once a month at most, and only when the ground isn't waterlogged or frosty.

Mowing Height in Summer

The temptation in summer is to cut the lawn short so you can go longer between cuts. This is a mistake that I see backfire regularly. Keep your mowing height at 4–5cm during the summer months.

Cutting lower than 3cm in summer does several things, none of them good:

• It stresses the grass during warmer periods, leading to browning and thinning
• It exposes the soil surface to drying out and to weed seed germination
• It removes too much of the blade, triggering the stress response described above
• It weakens the lawn's ability to compete with creeping weeds like clover and speedwell

A lawn kept at 4–5cm looks lush, stays greener in warm weather, and is far more weed-resistant than one that's been scalped short. Leave the bowling-green settings for autumn — in summer, slightly longer is healthier.

Edges Matter as Much as the Cut

Here's something most people underestimate: the edge of the lawn is what people notice first. You can have a perfectly mown lawn, but if the edges are ragged and the grass is flopping over onto the path or into the border, the whole garden looks unkempt.

Good edging uses either a half-moon edging iron (for redefining the line) or a long-handled edging shear or strimmer to cut the vertical edge clean. I run a strimmer around the edges after mowing on every visit, and it's genuinely one of the most transformative parts of the job — it gives the lawn that crisp, defined look that makes the whole garden feel more cared for.

If you're doing your own mowing, don't skip the edges. It adds ten minutes to the job but makes a significant visual difference.

What Happens If You Skip Cuts

Two weeks without a cut in a Cornish June is all it takes for a lawn to become a problem. Here's what you're dealing with when the grass gets too long:

• You can't cut it safely to normal height. If the grass has reached 10–12cm, cutting it back to 4cm in one go violates the one-third rule and will cause yellowing and patchy die-back. You have to take it down in two or three passes over the course of a week or two.
• The base of the grass goes yellow. Grass blades that have been shaded by the growth above them lose their colour. When you cut, you reveal this yellow layer underneath — the lawn looks patchy and uneven for several weeks until it recovers.
• It can take a month to fully recover. A well-maintained lawn cut regularly looks its best all season. A lawn that's gone long and been hard-cut back looks rough for weeks, however carefully it's done.

Adjusting for Dry Spells

Cornwall doesn't get many extended dry spells, but we do get them occasionally — usually in late July or August. When there's been no meaningful rain for a week or more, adjust your approach:

• Raise the blade height slightly — longer grass shades the roots and reduces moisture loss
• Cut a little less frequently — grass under drought stress grows more slowly and needs cutting less often
• Don't be alarmed if the lawn browns slightly — healthy grass will recover quickly once rain returns

In Cornwall, any dry spell tends to break within a week or two. The lawn bounces back faster here than almost anywhere else in the UK.

What About Holiday Lawn Care?

Two weeks away in peak season is one of the most common reasons I get a call about a lawn that's got out of hand. Your options are:

• Ask a neighbour. If you have a trustworthy neighbour with the right equipment, a single cut while you're away can make all the difference.
• Book a one-off visit. I'm happy to come out for a single cut during or just after your holiday, even if you don't have a regular arrangement. It keeps the lawn manageable and means you're not spending the first weekend back wrestling with an overgrown mess.
• Accept the recovery time. If the lawn does get long, just don't panic-cut it all off in one go. Take it down gradually and it'll be back to normal within a couple of weeks.

How My Regular Grass Cutting Service Works

The most cost-effective way to keep a lawn looking good throughout the season is a regular maintenance arrangement. I visit on a set weekly schedule during the main growing season (typically April through October), cutting, edging and tidying on each visit.

The advantage over occasional or one-off cuts is significant: because the grass never gets too long between visits, every cut follows the one-third rule, the lawn stays consistently healthy, and the edging stays defined rather than needing to be completely re-cut each time. Regular customers also tend to have noticeably better lawns by the end of the season than those who call when the grass gets out of hand.

If you're based in Newquay, Perranporth, Padstow, Wadebridge, Truro or anywhere across Cornwall and you'd like to talk about a regular grass cutting arrangement — or even just a one-off visit — give me a call or drop me a message. I'll come out, have a look at the lawn, and give you a straightforward quote with no obligation.