When to cut grass after winter
When to cut grass after winter: the trigger is growth plus a firm, dry lawn, not a calendar date. How high to cut the first time and how to check your soil.
Published 23 February 2026 ·Last reviewed 5 October 2026
Cutting grass after winter is a question of two conditions being true at once: the grass is growing again, and the ground will take a mower. Both arrive earlier in a mild year than a cold one, and earlier in Cornwall than in Aberdeenshire. The first warm Saturday of the year satisfies neither test on its own, and it is where most first cuts go wrong.
When should you cut grass after winter?
Start with the grass. Cool-season grasses resume growth when the soil holds above about 6C, which is the threshold Teagasc gives for meaningful grass growth and the parameter our own model uses. Sources put it in a band of roughly 5 to 6C, and it is a soil temperature at depth, not the air temperature on the weather app. When does grass start growing in the UK covers that threshold in full, including why the date it is crossed moves by weeks between years.
Then the ground. This is usually the binding constraint in spring and the one people skip. Soil that has been wet all winter deforms under load instead of springing back. Walk a mower across it and you leave wheel marks that can take the whole season to grow out. Take a ride-on across it and you leave ruts you will have to level.
The two are worth keeping separate, because the ground being firm enough is not the same thing as the grass being dry. Leaves dry in hours. A soil profile takes days or weeks to drain after a wet winter.
So the right first cut is not the first warm day. It is the first dry day after a dry-ish spell, with the grass visibly growing.
How high should the first cut be?
High. Higher than you think, and higher than you intend to keep it through the summer.
The plant has spent winter running on limited light. Its root system is at its annual low and its reserves are depleted, and leaf area is how it rebuilds both. Remove most of that leaf in a single pass and you force it to spend reserves it does not have on regrowing leaf, at the expense of root.
About 40mm is a reasonable target, or simply the mower’s highest setting. That matches the RHS advice for the first spring mow: raise the blades around 5mm above the usual cutting height, with 40mm the top of the usual range for domestic lawns in spring. Then come down a notch at a time over the following weeks until you reach your summer height. How to choose that summer height is its own question, and we cover it in how short to cut grass.
The one-third rule
Never take more than about a third of the leaf blade in a single cut. The RHS mowing guide puts it plainly: mow regularly so you only need to remove a small amount each time, and never take off more than one third of the grass height. It applies all year and it matters most on the first cut.
If the lawn got away from you over a mild winter and is sitting at 10cm, do not go straight to 5cm. Take it to 7cm, wait three or four days, then take it to 5cm. Two passes and a week is a far smaller shock to the plant than one hard cut.
This is also why frequency beats height adjustment, and why the interval matters more than the setting. Cut little and often and you stay inside the rule without having to think about it. How often should you mow a lawn sets that interval.
Sharpen the blade first
A winter in the shed does a mower blade no favours, and the first cut is often through slightly damp, soft growth that a blunt blade will tear rather than sever. Torn tips brown off within a few days, which is why some lawns look worse a week after their first cut than they did before it.
Sharpen it now, or have it sharpened, rather than in June when you finally notice.
What to leave until later
The first cut is not the moment to do everything else you have been planning.
Do not scarify yet. It is a serious intervention, and the lawn needs to be growing strongly before it can recover from one. The timing logic is in when to scarify a lawn in the UK.
Do not feed grass that is not growing. Nitrogen applied to a dormant lawn is mostly wasted, and some of it leaches away. The RHS position is to feed only once growth is well underway, and only if the lawn needs it, which when to apply spring lawn feed takes apart.
Do not roll it. Rolling a wet lawn compacts it, and compaction is a much harder problem to fix than a bumpy surface.
Your lawn’s first-cut date
Both conditions cross on a different date every year and in a different week in Aberdeen than in Exeter. Month-based advice describes an average year, and your lawn does not live in one. That gap is the thing we built mowdar to close.
For any UK or Ireland location we model soil temperature at 6cm and growth potential on the PACE Turf framework, so you can see whether your soil has crossed the growth threshold yet and when the forecast says it will, with a confidence figure from a 94-run ensemble. We also score ground firmness from a fortnight of rainfall rather than just today’s weather, which is the second of the two conditions. The soil temperature page is the direct lookup, and the mow forecast puts it together for the days ahead.
FAQ
Is it too early to cut the grass in March? Often, yes. March is when the question gets asked, but the answer is a soil temperature and a growth observation rather than a month. If the grass has not visibly grown, there is nothing to cut, and the RHS’s own March advice is to mow only when the weather is mild enough and the grass shows signs of growth.
Can you cut grass after a frost? Wait for the frost to lift and the leaf to dry. Frozen and frosted grass bruises easily, and marks made on it take weeks to disappear. Frost and your lawn covers what frost does to the leaf and the soil.
Can you cut the lawn when it is wet? You can, and you will regret it. Wet clippings clump and smother, and wheels on wet soil compact it. The full version is in why you should not mow wet grass, but the short one is that a day or two of patience is cheaper than a season of repair.
What if the lawn is already long? Take it down in steps, inside the one-third rule each time. A lawn at 10cm goes to 7cm first, then 5cm a few days later. It looks unremarkable for a week and recovers far faster than a single scalping.
Check whether your lawn is ready for its first cut. We model the soil temperature and the ground firmness for your location, so the answer is about your lawn rather than the calendar.