Every year we get asked for a date, and every year the honest answer is that the grass decides. Some seasons growth stops in late October. In a mild autumn people are still cutting in the third week of November.
What matters is watching the lawn rather than the calendar, and knowing what height to finish at.
Grass stops growing at a soil temperature, not a date
Cool-season grasses — which is what almost every lawn in this area is — keep growing until soil temperatures drop to around 10°C consistently, and slow to a genuine stop in the region of 5°C. Air temperature swings around far more than soil does, which is why a single cold night means nothing.
The practical version: keep mowing while it keeps growing. If you cut and a week later it visibly needs cutting again, the season is not over.
Why the final height matters so much
This is where real damage happens, in both directions.
Left too long
Long grass folds over under snow and stays matted and damp for months. That is the ideal environment for snow mould, which shows up in spring as circular grey or pink patches that take weeks to grow out. It also gives voles cover to tunnel around in, and vole damage in a lawn is genuinely infuriating.
Cut too short
Scalping the lawn for winter exposes the crown of the plant, removes the leaf area it needs to store energy, and stresses it going into the hardest months. Short grass also offers no insulation to its own root zone.
Slightly shorter than your normal summer height. Not scalped, not left shaggy. That is the entire answer.
In practice most lawns here are mown somewhere around 7 to 8 cm through summer, and the final cut wants to come down modestly from that — not to the lowest setting on the mower.
Work down gradually, not in one pass
If your lawn is long and you want it shorter for winter, take it down over two or three cuts rather than one. Removing more than about a third of the leaf blade in a single cut shocks the plant, and doing that as the last thing before winter is poor timing.
The last cut checklist
- 1
Keep mowing while it grows
Do not stop on a date. If it needs cutting a week after the last cut, keep going.
- 2
Come down gradually
Over two or three cuts if you are reducing height, never more than a third of the blade at once.
- 3
Clear the leaves at the same time
Mulching a light leaf layer into the lawn with the mower is good for the soil. A thick wet mat needs removing.
- 4
Cut when it is dry
Mowing wet grass tears rather than cuts, leaves clumps that smother the lawn, and compacts soft ground under the mower.
- 5
Sharpen the blade before you put it away
A dull blade tears the grass, and a torn leaf going into winter heals slowly. It also means the mower is ready in spring.
What about leaves that keep coming after you have stopped?
They still need clearing off the grass even once mowing is done. This is why a proper autumn programme usually involves two visits rather than one — the lawn work happens while the grass is growing, and a final leaf pass happens after most of them are down.
And in spring?
Wait. The single most common spring mistake is mowing and raking a lawn that is still soft and waterlogged, which compacts the soil and tears at grass that has not started growing properly. Let it dry out and start growing before the first cut.