Quick Answer
In the UK, mow your lawn once a week from late March to October during peak growth, dropping to once every 10–14 days in mid-spring and early autumn, and not at all from November to February. Never cut more than one-third of the grass blade in a single mow. That’s the rule that keeps a lawn green, dense and healthy without scalping it.
But — like most gardening rules — there’s nuance. The right answer depends on your grass type, the weather, your soil, and what you actually want the lawn to do.
This guide walks through the schedule month by month, explains the all-important “one-third rule”, and answers the questions that catch most UK lawn-owners out.
The One-Third Rule (The Most Important Mowing Rule)
Never remove more than one-third of the grass blade in a single mow.
If your grass is 6cm tall, the lowest you should cut it is 4cm. Take any more off in one go and you stress the plant — the roots have to compensate, the lawn yellows, weeds and moss get the gap they need to move in, and the whole thing turns into a chore.
This is also why the answer to “how often should I mow?” depends on how fast the grass is growing, not the date on the calendar. In peak May, grass can grow 3cm in a week — so a weekly mow keeps you inside the one-third rule. In a dry July, growth slows; mowing weekly does more harm than good.
Watch the grass, not the calendar.
Mowing Frequency by Season (UK)
| Season | Frequency | Cutting height |
|---|---|---|
| Spring (March–May) | Once every 10–14 days early; weekly by mid-April | 4–5cm (high to start, lower as it warms) |
| Summer (June–August) | Weekly — drop to fortnightly in drought | 4cm normally; raise to 5–6cm in heat |
| Autumn (September–October) | Once every 10–14 days, lighter cut | 5cm |
| Winter (November–February) | Don’t mow unless mild AND dry AND grass is growing | 5cm if needed |
How Often to Mow in Spring
The first cut of the year is usually mid to late March in the south of England (Surrey, Sussex, Kent), or early April in colder regions. Wait until:
- The grass is actively growing (look for fresh green tips)
- Daytime temperatures are consistently above 6°C
- The ground is firm enough to walk on without sinking
The first mow of the year should always be a high cut. Set the blades to the highest setting — you’re tidying, not scalping. Over the next 4–6 weeks you can gradually lower the height as the grass strengthens.
By mid to late April most UK lawns are growing fast enough to need a weekly mow.
How Often to Mow in Summer
In June and July, peak growth means weekly mowing keeps the lawn inside the one-third rule. Two key adjustments to make as it gets hotter:
- Raise the cutting height to 5–6cm. Longer grass shades its own roots, retains moisture, and outcompetes weeds.
- Don’t mow drought-stressed lawn. If the grass is brown and dormant, mowing makes it worse. Wait for rain — grass recovers faster than people think.
Some gardeners mow twice a week in peak season to maintain stripes and a perfect surface — that’s fine if you enjoy it, but it’s not necessary for a healthy lawn.
Don’t water unless the lawn is brand new. Established lawns recover from drought; shallow-rooted lawns from constant watering don’t.
How Often to Mow in Autumn
September and October are about easing the lawn into winter — not maintaining peak appearance.
- Mow every 10–14 days
- Raise the cutting height back up to 5cm
- The last mow is usually in October (mild years can go into early November)
- Stop mowing when growth stops. Once daytime temperatures sit consistently below 6°C, the grass isn’t growing and mowing only damages it.
This is also the best month to scarify, aerate and overseed — but these are jobs in their own right, not part of regular mowing.
How Often to Mow in Winter
Almost never. UK lawns generally don’t need mowing from November to February.
The only exceptions:
- A particularly mild winter (consistent 6°C+) where grass is still growing
- A long-grass lawn that needs a final tidy in early December
Even then: only mow if the ground is dry and not frozen. Walking a heavy mower over wet or frozen turf compacts the soil and damages the crown of the grass plants — both invite moss in spring.
Should You Leave Grass Clippings on the Lawn?
Most of the time, yes. A mulching mower (or any mower without a collection box) chops the clippings finely and drops them back. They break down within a few days and return nitrogen, potassium and moisture to the soil — saving you a lawn feed and reducing the need to water.
When to collect clippings:
- The grass is too long (clippings will sit in clumps and smother the lawn)
- The lawn is damp and clippings will mat
- You’re trying to reduce thatch
For most weekly summer mowing, leave the clippings where they fall.
What About No Mow May?
The Plantlife campaign asks gardeners to leave their lawn unmown for the whole of May to help pollinators (bees, hoverflies, moths). It works — even a small unmown patch produces 10× more nectar.
You don’t have to do the whole lawn. A practical compromise that works in most Surrey gardens:
- Leave one section of lawn unmown for May (and ideally into June)
- Continue weekly mowing of the rest
- Cut the long section once at the end of June, then resume normal mowing
You get the pollinator benefit, you don’t end up with a meadow you can’t walk on, and the long section recovers fine.
Common Mowing Mistakes (And What They Look Like)
Scalping (cutting too short)
- Visible: yellow patches, exposed soil, moss appearing
- Fix: raise the blade height by 1–2cm. Stick with it for 4 weeks.
Mowing too rarely
- Visible: clumps of long clippings, yellow patches under the clumps
- Fix: shorter, more frequent cuts. If the grass is much too long, cut it in two passes a few days apart — never take off more than a third in one go.
Mowing wet grass
- Visible: ragged tips, mower tracks, clumping
- Fix: wait until the lawn is dry. Even dry-looking grass after rain is wet at the base — give it a full sunny day.
Blunt blades
- Visible: brown, frayed leaf tips a day after mowing
- Fix: sharpen mower blades twice a season. Most mower shops will do it for £15–£25.
Mowing in the same direction every time
- Visible: ruts, leaning grass, uneven cut
- Fix: alternate direction every mow.
How Often Should a Gardener Mow My Lawn?
If you’re paying for garden maintenance in the UK, the standard service includes:
- Weekly mowing from April to September (with edging)
- Fortnightly mowing in March and October
- No mowing in winter (unless growth continues)
That’s roughly 25–30 visits a year for most domestic gardens. Larger gardens or perfectionist lawns sometimes need twice-weekly visits in May and June.
We provide garden maintenance services across Surrey on exactly this rhythm — written into a calendar so the visits happen at the right intervals through the season.
Frequently Asked Questions
How often should I cut grass in the UK?
Once a week from late April to September, every 10–14 days in March, October and early November, and not at all from late November to early March. Always follow the one-third rule (never cut more than a third of the leaf in one go).
Is October too late to mow the lawn?
No — October is still a normal mowing month for most UK gardens. Mow every 10–14 days at a slightly higher height. Most lawns get their last cut in late October or early November, depending on temperature.
Should I mow my lawn in October in the UK?
Yes. Grass continues to grow until daytime temperatures drop consistently below 6°C, which usually doesn’t happen until November. Keep mowing on a high setting through October.
Should you leave grass clippings on the lawn?
Yes — most of the time. Short clippings break down quickly and return nutrients to the soil, reducing the need to feed and water. Only collect clippings if the lawn is wet, the grass is too long, or you’re trying to reduce thatch.
What is the best time of day to mow the lawn?
Mid-morning to early afternoon (10am to 2pm), once any dew has dried but before the heat of late afternoon. Avoid mowing in direct hot sun — the freshly cut tips dry out and brown.
How short should I cut my grass in the UK?
4–5cm is right for most UK lawns. Lower than 3cm stresses the grass, encourages moss and weeds, and dries out the soil. Raise to 5–6cm in summer heat and for the first cut of the year.
When should I stop mowing in autumn?
When growth stops — usually late October to mid-November. The signal is daytime temperatures dropping consistently below 6°C and the grass no longer regrowing between mows.
Want Your Lawn Looked After Properly?
Mowing right is half the job — the other half is feeding, scarifying, aerating and edging at the right times of year. We provide year-round lawn and garden maintenance across Surrey from our base in Dorking — including weekly mowing through the growing season as part of a scheduled visit plan.
