Quick answer
Fortnightly from April to September is the sweet spot for most UK lawns.

In May, fast-growing lawns may need weekly cuts. In March and October, once a month is enough. From November to February, stop cutting entirely and let the grass rest. The exact frequency depends on your grass type, shade, rainfall, and how much growth you've had since the last cut — but fortnightly covers the vast majority of British gardens during the growing season.

Grass cutting frequency is one of those things most people guess at. You look out the window, decide it looks a bit long, and mow it. Then wonder two weeks later whether you left it too long again.

The trouble is that UK grass doesn't grow at a constant rate. It surges in spring, plateaus in the heat of summer, slows in autumn, and stops almost entirely in winter. The soil temperature, rainfall, time since last cut, shade coverage, and grass variety all affect how quickly your lawn grows back. Treating every month the same is a recipe for either overworking the lawn in January or neglecting it in May.

This guide gives you a clear month-by-month picture — what the grass is doing, when to cut, how often, and what to watch out for at each stage of the year.

Month-by-month cutting guide

The UK growing season runs roughly April to October, with a dormant period from November through February. Here's what to do each month:

January
Rest
Don't cut
Grass is dormant. The ground may be frozen or waterlogged. Cutting now causes unnecessary stress and can damage roots. Leave it entirely alone — it doesn't need your help right now.
February
Rest
Don't cut
Still dormant. Soil is often soft from winter rain, which means the mower can compact it and leave ruts. If you spot any growth, it's a sign spring is close — but hold off until March.
March
First cut
Once, if conditions allow
Cut only once overnight temperatures are consistently above 7°C. Set the blade high — don't scalp a lawn coming out of winter. This first cut is about waking the grass up, not tidying it aggressively.
April
Growing
Fortnightly
Growth is accelerating quickly as soil warms and day length increases. Move to fortnightly from this point. Lower the blade slightly from your March height but avoid cutting below a third of the grass length in a single pass.
May
Peak growth
Weekly for fast growers · Fortnightly for most
Peak growth period. A lawn can go from neat to overgrown in a week in May. Fast-growing varieties, fertilised lawns, or gardens with high rainfall may need weekly attention. Most standard lawns: stick to fortnightly but don't let it get ahead of you.
June
Active
Fortnightly (weekly for fine or shaded lawns)
Growth remains strong but often steadies from May's peak. Fortnightly suits most gardens. Fine lawns and shaded areas that recover slowly may still need weekly attention to stay presentable.
July
Active
Fortnightly · Raise blade in dry spells
In a dry July, grass growth can slow considerably. Raise the blade height if the lawn is under stress — longer grass shades the soil and retains moisture better. If it's been wet, fortnightly keeps things tidy without overdoing it.
August
Active
Fortnightly · Monitor growth rate
Same approach as July. Fortnightly remains the right call for most. Watch for the growth rate slowing as days shorten. If the lawn isn't growing much between cuts, you can ease back — no need to cut on a fixed schedule if the grass doesn't need it.
September
Easing
Fortnightly easing to monthly
Growth is visibly slowing. Start extending the gap between cuts — move towards monthly by the end of the month. This is also the best time for lawn treatments: overseeding, aeration, and scarifying while the soil still holds warmth.
October
Slowing
Monthly or stop
Growth has slowed significantly. If it still needs a cut at all, once a month is plenty. Raise the blade — leaving it a touch longer helps the lawn handle the colder months ahead. Stop when growth stops.
November
Stop
Stop cutting
Cutting in November does more harm than good. The grass is slowing to a halt, the ground is becoming waterlogged, and mowing can cause compaction and disease. Leave it to rest.
December
Rest
Don't cut
The lawn is in full dormancy. Nothing to do here. Step away from the mower until March.

What happens if you leave it too long?

There's a common assumption that if you miss a cut, you just mow it next time and everything is fine. That's partly true — but it depends on how long you leave it and how much growth has happened in between.

The one-third rule matters here: you should never cut more than a third of the grass blade length in a single mow. If your lawn has grown to 9cm when you normally cut it at 5cm, you'd need to bring it back down in stages — not all at once. Cutting too aggressively stresses the plant, removes the food-producing top growth, and can leave you with brown, patchy results.

For an overgrown lawn, the recovery often takes two or three cuts spaced a few days apart. That's more time, more fuel, more effort — and sometimes more money if you're paying for the service — than simply keeping on top of it fortnightly.

One-off cut after neglect

Stressed grass, patchy results

Removing too much at once shocks the plant, exposes weak stems, and can leave the lawn looking brown rather than green. Recovery takes time and you may need multiple follow-up cuts.

Regular fortnightly schedule

Always in good shape

Each cut removes a small amount of growth. The grass stays dense, green, and well-rooted. No stress, no scalping, no recovery period — just a consistently tidy lawn with minimal effort per visit.

This is why a recurring service pays off compared to occasional one-off cuts. You're maintaining the lawn rather than rescuing it each time.

Rather someone else handled the schedule?

MowBox runs a fortnightly service across Huddersfield and HD postcodes. Free first visit — no commitment until you're happy.

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What affects how fast your grass grows?

Two neighbours with similar-sized gardens on the same street can have very different cutting needs. These are the main factors that determine your lawn's growth rate:

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Grass type and variety

Ryegrass-dominated lawns grow aggressively and need more frequent cutting. Fine fescue mixes grow more slowly and are better suited to fortnightly schedules. Most UK lawns are a mixed blend — if yours was seeded from a standard lawn mix, fortnightly is almost certainly right.

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Shade coverage

Shaded grass grows more slowly than a fully open lawn — but it also recovers more slowly after each cut. Shaded areas are often more fragile and need higher cutting heights and lighter, less aggressive mowing. They may still need cutting just as often to look tidy, even though the growth rate is lower.

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Rainfall and soil moisture

Wet conditions accelerate growth significantly. A wet May in a northern English garden can see grass grow faster than you'd expect — pushing weekly cutting frequency for fast growers. Conversely, a dry July can slow growth dramatically, making fortnightly unnecessary. Follow the grass, not the calendar.

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Recent renovation or feeding

A lawn that's been aerated, overseeded, or fertilised in autumn or spring will grow more vigorously the following season. If you've renovated recently, expect more growth and adjust accordingly — you may need to shift from fortnightly to weekly temporarily during peak spring growth.

The case for a fixed schedule over judging it yourself

Most people say they'll cut the grass "when it needs it." The problem is, that's harder to judge than it sounds — and the bar tends to drift.

In spring, you look out and think: "It's looking a bit long, but it'll be fine for another week." Two weeks later, you've got a jungle. In autumn, you cut it when it didn't really need cutting, because you're used to doing it every fortnight. In winter, you cut it once more than you should have because there was one warm weekend and it seemed like a good idea.

The alternative is a fixed fortnightly schedule, running April to September, with a sensible start in March and a wind-down in October. You know when it's happening. The grass stays in a predictable state. You never end up with an out-of-control lawn the week before guests arrive.

Judging it as you go

Reactive — and usually late

By the time most people decide the grass "needs" cutting, it's already past the ideal length. The cut is more stressful for the lawn, harder to do neatly, and takes longer.

  • Growth creep — it gets away from you in peak season
  • Bigger cuts = more effort each time
  • Higher risk of scalping when playing catch-up
  • Inconsistent appearance throughout the season
Fixed fortnightly schedule

Predictable. Always presentable.

You know when the next cut is. The grass never gets far enough ahead to cause problems. Each visit is quick because there's not much growth to deal with.

  • Consistent length — never too long, never scalped
  • Less stress on the grass each time
  • Lower risk of thatch and disease buildup
  • No weekend panic before an event or visitor

This is exactly how MowBox runs. You book a fortnightly slot, we show up on schedule, the grass stays in good shape. You stop thinking about it.

Frequently asked questions

March, once overnight temperatures are consistently above 7°C. Below that threshold, the grass isn't really growing — and cutting it just stresses roots that are still in winter mode. Set the blade high on your first cut of the year. You're waking the lawn up, not giving it a crew cut.
Try to avoid it. Wet grass clumps together, can clog or jam the mower deck, and leaves an uneven finish as the blades flatten rather than stand up. It also increases the risk of soil compaction from the mower's weight. Wait a few hours after rain if possible — usually it's fine by mid-morning even after an overnight downpour.
If the grass gets significantly taller than your target cutting height, you can't cut it all the way back in one pass without stressing the plant. The one-third rule means you'd need two or three cuts spaced a few days apart to bring it back safely. Each cut removes a third of the current length, letting the grass recover between passes. This takes more time — and more cost if you're paying a service — than staying on top of it fortnightly.
Yes. Longer grass shades the soil surface, slows evaporation, and protects the root zone from heat stress. Raise your mower blade by one notch during dry spells and reduce cutting frequency. If the grass isn't growing much between cuts, there's no point cutting just because you're "due" one — skip that visit and check again in a week.
Slightly, yes. Shaded grass grows more slowly but is generally thinner, weaker, and more sensitive to cutting. Always cut shaded areas a bit higher than open lawn — this gives each blade more leaf surface to photosynthesise with. The cutting frequency can often be the same as an open lawn (fortnightly in season), but use a lighter touch and never scalp it back hard.