"When should I stop cutting the grass?" comes up every September, usually phrased as though there's a date I'm keeping from people. There isn't one. The lawn decides, and it tends to keep going a good deal later than most people expect — I've cut grass in Ledbury in the first week of December more than once.
The last cut is a condition, not a date
Grass grows while the soil stays above roughly 5°C. In the Three Counties that means growth usually carries on into November, and in a mild wet year it barely stops at all. What changes is the pace: a lawn that needed cutting weekly in June might want it every three or four weeks by late October.
So the rule is simple. Keep cutting while it's still growing, just less often. The moment to stop is when you look at the lawn a fortnight after the last cut and it hasn't really moved.
Stopping early on a calendar date is the more common mistake, and it costs you. Grass left long through a wet autumn mats down, holds water against the crown, and comes out of winter patchy and thin.
Raise the blade before you stop
The one thing worth changing is height. Summer cutting height is too low for the back end of the year.
Come up a notch or two from about mid-September. Around 4cm is a sensible target for the last few cuts, against the 2.5–3cm a lot of people run in summer.
Longer leaf means more root. The plant is storing energy for winter, and it does that through the leaf it's got. Scalping in October takes that away at the worst moment.
Don't go too far the other way. Left really long, the grass flops, mats, and invites disease under the first wet leaf fall. Slightly longer than summer, not shaggy.
Make the final cut a tidy one. Even growth, edges done, nothing left in heaps. That's the state you want it sitting in for three or four months.
Leaves matter more than the final cut
If there's one autumn job that changes how a lawn looks in March, it's getting leaves off it — not the mowing.
A layer of wet leaves blocks light and traps damp against the grass. Two or three weeks of that and you get yellow patches that don't recover until well into spring. Under the big limes and horse chestnuts around the older Ledbury and Colwall gardens, leaf fall can smother a lawn in a fortnight.
Little and often beats one big clearance in December. A mower with the box on will lift a light scatter of leaves and shred them at the same time, which is the least effort for the best result. Heavier falls want raking or blowing off first.
When not to cut at all
Two conditions where the right move is to leave it:
Frost. Frozen grass blades shatter rather than cut, and walking a mower over a frosted lawn leaves footprints that show for weeks. Wait for it to thaw.
Properly wet ground. Mower wheels rut soft soil and compact it, and compacted ground is a slow problem to undo. If you sink walking on it, it's too wet to mow.
Neither of these means the season is over. It usually just means not today.
Bottom line
Keep cutting while it grows, raise the blade from September, and get the leaves off. There's no date in the diary — there's a lawn that slows down, and one last tidy cut whenever that happens to fall.
The other end of this is the first cut in spring, which matters just as much and is easier to get wrong.
If the autumn tidy is more than you fancy, give me a call. I look after lawns through the back end of the year across Ledbury and out towards Upton-upon-Severn, and the leaf work is a good part of it.