When to Start Mowing Your Lawn in Cornwall

If you're waiting until April to get the mower out, you're already behind. Down here in Cornwall, lawns start growing — really growing — much earlier than most people expect. I've been cutting grass across Newquay and the surrounding areas for years, and every spring I see the same thing: people caught off guard by a lawn that's suddenly shin-high before Easter.

The good news is that once you understand why Cornwall is different, it all makes sense. And knowing when to start — and how — makes a big difference to how your lawn looks all year.

The 5°C Rule: Why Soil Temperature Is What Actually Matters

Grass starts growing when the soil temperature reaches 5°C. That's the threshold. Below that, the roots are essentially dormant and cutting does more harm than good — you're just stressing the plant unnecessarily and risking disease.

In most of England, soil temperatures don't consistently reach 5°C until late March or even April. But Cornwall sits on the Atlantic fringe, buffered by the Gulf Stream. Our winters are mild, our soil never gets as cold as inland counties, and we rarely see the hard freezes that keep grass truly dormant further east. By late February — sometimes even mid-February in a mild year — Cornish lawns are already ticking over.

You don't need a soil thermometer to check. The simple test: if the grass is visibly growing and the ground isn't waterlogged or frosty, it's time to think about a first cut.

The First Cut of the Year: Keep It High

When you do bring the mower out for that first spring cut, don't go lower than 4cm. I'd actually say 4.5–5cm for a first pass if the lawn has been resting since autumn.

The temptation is to scalp it — get it short, tidy it up after months of winter growth. That's the worst thing you can do. Cutting too low in early spring removes too much leaf blade at once, weakens the plant, and leaves it vulnerable to moss and weeds filling the gaps. You end up with a patchy, yellowed lawn by April.

The rule to remember is the one-third rule: never remove more than one-third of the grass height in a single cut. So if your lawn is 9cm tall after winter, your first cut should take it down to around 6cm — not lower. Then cut again a week or two later and bring it down a little more.

How Often to Mow in Spring vs Summer

Once you're into the growing season, the frequency matters as much as the height. Here's roughly what I'd recommend for a Cornish lawn:

• February–March (early season): Once every 2–3 weeks, depending on growth. Keep the blade high at 4–5cm. You're just managing length, not shaping.
• April–May (spring peak): Once a week. Grass is now growing fast. Missing a week means the lawn gets away from you quickly.
• June–August (summer): Once a week, sometimes more often if it's been wet. Cornwall's Atlantic rain keeps grass growing through summer when drier parts of the UK see lawns slow down in the heat.
• September–October (autumn taper): Every 10–14 days. Growth is slowing. Start raising the blade height back toward 4–5cm.
• November onwards: Stop cutting when growth has genuinely stopped or if the ground is waterlogged. Don't mow wet grass — you'll tear the roots and compact the soil.

What Scalping Does to Your Lawn

Scalping — cutting the grass too short, especially in spring — is one of the most common lawn mistakes I see. It looks tidy immediately after, but within a week you'll notice yellow or brown patches where the grass has gone into shock.

When you cut too low, you remove the green leaf tissue the plant uses for photosynthesis. The grass has to draw on its reserves to recover, leaving it weakened. In those bare patches, moss, clover, and annual weeds move in fast — especially in Cornwall's damp conditions.

A well-maintained lawn with the blade kept at the right height will outcompete weeds naturally. The grass is thick, healthy, and shades out anything trying to establish below it. Scalp it, and you invite problems that take months to fix.

What Happens If You Leave It Too Long Between Cuts

The flip side of cutting too short is leaving it too long. If your lawn gets above 10–12cm, you've got a problem. Cutting it back to normal height in one go means removing too much leaf at once — back to the one-third rule issue.

With a very long lawn, you need to take it down gradually over two or three cuts across a couple of weeks. It's more work, and the lawn will look a bit rough in the interim. There's no shortcut around it.

I see this most often with holiday cottages and second homes. The owners are away for a few weeks in summer, the grass shoots up in Cornwall's wet growing conditions, and they come back to what looks more like a meadow than a lawn. It's completely fixable, but it takes time and the right approach.

Holiday Periods: What Happens to Your Lawn When You're Away

This is something I get asked about a lot, particularly by older customers who spend a few weeks away visiting family or on holiday. In summer, a Cornish lawn can easily put on 5–8cm of growth in two to three weeks. Left any longer, and you're looking at a serious catch-up job.

The honest answer is that a regular mowing service — someone who comes every week or fortnight while you're away — is far better than leaving the lawn to its own devices and dealing with the aftermath. Not just for appearances, but for the health of the grass itself.

I look after lawns for quite a few customers who like the reassurance of knowing it's being taken care of whether they're home or not. It's one of those things that's much easier to maintain than it is to rescue.

Cornwall-Specific Challenges: Salt Air and Atlantic Conditions

Living on the coast in Cornwall brings its own challenges for lawns. Salt air carried on strong Atlantic winds can cause browning at the tips of grass blades — it's sometimes mistaken for drought stress or disease. If your garden is exposed to the prevailing westerly winds off the Atlantic, you may see this on the windward side of your lawn in particular.

The fix isn't complicated: keep the grass a little longer on exposed sides, and water after particularly stormy periods if the soil has dried out. Thick, healthy grass handles salt wind better than a closely cropped lawn with no reserves.

Cornwall's high rainfall — most of our coastal areas see upwards of 1,000mm a year — means waterlogging is also a genuine concern in wet winters and springs. Never mow waterlogged grass. You'll compact the soil, create ruts, and tear up the root structure. Wait for the surface water to drain and the ground to firm up. A day or two of patience saves weeks of recovery work.

The Autumn Taper: Setting Your Lawn Up for Winter

Getting the autumn right is just as important as the spring. As the season winds down — and in Cornwall that's typically October into November — you want to gradually raise the cutting height back up rather than continuing to cut short.

Your last cut of the year should leave the lawn at around 4–5cm. This gives the grass enough leaf surface to keep photosynthesising on mild winter days (which we get plenty of in Cornwall) without being so long it creates a wet, matted surface that encourages moss and fungal disease.

Don't make the last cut of the year a drastic one. A gentle tidy before the growing season ends is all you need.

A Regular Grass Cutting Service Takes the Guesswork Out

Keeping on top of a lawn is genuinely satisfying when the timing and technique are right. But I know that for a lot of people — particularly those who find the physical side of gardening more difficult than it used to be — it can become a source of stress rather than pleasure.

That's where I come in. I offer a regular grass cutting service across Newquay and the surrounding areas of Cornwall, including Perranporth, Padstow, Wadebridge, Truro, and St Austell. Whether you need a weekly visit through summer or a fortnightly tidy-up, I'll keep your lawn looking exactly as it should — and I'll adjust the height and frequency with the seasons so you don't have to think about it.

If you're not sure what your lawn needs right now, give me a call or drop me a message. I'm happy to come and take a look, no obligation, and give you an honest assessment of what would help.